CN107426961A - It is coated rice paddy seed and preparation method thereof - Google Patents

Abstract

The present invention provides coated rice seeds comprising a coating layer comprising: polyvinyl alcohol having a degree of polymerization of 500 or more and having a degree of saponification in the range of 71.0-97.5 mol %; zinc oxide; bentonite; and surfactants.

Description

Coated rice seeds and preparation method thereof

technical field

The invention relates to a coated rice seed and a preparation method thereof.

Background technique

Paddy direct sowing cultivation means a cultivation method by directly sowing rice seeds into a paddy field, which has the advantage of saving agricultural work because the method does not require some seedling raising and transplanting work. However, this method has the disadvantage of being susceptible to feeding damage by birds such as ducks and sparrows, ie, avian infestation. Strategies for avoiding bird infestation are needed due to reduced yield due to reduced seedling emergence from bird infestation. As a conventional strategy for avoiding bird damage, for example, a method of preventing bird damage using water management has been proposed. However, this method necessitates changing the management system according to the type of bird (see, eg, Non-Patent Document 1).

In addition, iron-coated submerged direct sowing is known as a technical means for preventing feeding damage of house sparrows by coating rice seeds with iron powder to prevent the seeds from floating in soil surface sowing (see, for example, Non-Patent Document 2) . However, since this technical means utilizes the solidification of iron powder due to its oxidation, there are some onerous tasks in managing coated rice seeds, such as the need to release the heat generated by oxidation and some problems of lowering the germination rate unless the management is adequate. A solution to this problem is known as a method of coating rice seeds with polyvinyl alcohol having a high degree of saponification and a coating material such as iron oxide (see Patent Document 1).

reference list

patent documents

Patent Document 1: JP 2013-146266 A1

non-patent literature

Non-Patent Document 1: Nagao SAKAI and three others, "Prevention of bird damage in the flowed paddy rice direct sowing cultivation", The Hokuriku Crop Science, the Crop Science Society of Japan, March 31, 1999, Vol. 34, pp. 59-61

Non-Patent Document 2: Minoru YAMAUCHI, "A manual for direct sowing of iron-coated rice on a flooded paddy field 2010 (manual for direct sowing of iron-coated rice on a flooded paddy field 2010)", The National Agriculture and Food Research Organization, Western Region Agricultural Research Center, March 2010.

Summary of the invention

(problem to be solved by the present invention)

However, the control effect of iron oxide-coated rice seeds on bird damage is insufficient.

An object of the present invention is to provide coated rice seeds which are less susceptible to bird damage and prevent the seeds from floating and germination rate reduction.

(means to solve the problem)

The present inventors have studied intensively to find this coated rice seed, and thus found that polyvinyl alcohol, zinc oxide, etc. Sowing of rice seeds coated with , bentonite and surfactant to paddy field allows to ensure sufficient seedling rate in rice direct sowing cultivation due to reduced bird damage.

The present invention is as follows.

[1] A coated rice seed having a coating layer, wherein the coating layer comprises polyvinyl alcohol, zinc oxide, Bentonite and surfactants.

[2] A coated rice seed having a coating layer, wherein the coating layer comprises polyvinyl alcohol, zinc oxide and bentonite, and retaining a surfactant on at least the surface of said coated rice seeds.

[3] The coated rice seed according to [1] or [2], wherein the coating layer comprises at least one selected from the following group (A);

(A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate.

[4] The coated rice seed according to [3], wherein the coating layer has a first layer comprising at least one selected from the group (A) and is coated on the outside of the first layer The second layer contains zinc oxide.

[5] The coated rice seed according to any one of [1] to [3], wherein the coating layer further contains iron oxide.

[6] The coated rice seed according to [5], wherein the coating layer has a first layer comprising iron oxide and a second layer comprising zinc oxide coated on the outside of the first layer.

[7] A powdery composition comprising polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, zinc oxide, and bentonite.

[8] The powdery composition according to [7], comprising at least one selected from the following group (A);

(A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate.

[9] The powdery composition according to [7] or [8], wherein the average particle size is in the range of 0.01 to 150 μm.

[10] The powdery composition according to any one of [7] to [9], wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL.

[11] The powdery composition according to any one of [7] to [9], wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL.

[12] The powdery composition according to any one of [7] to [11], further comprising iron oxide.

[13] The powdery composition according to any one of [7] to [12], wherein the zinc oxide has an average particle size in the range of 0.01 to 100 μm.

[14] A kit for preparing coated rice seeds, said kit having at least polyvinyl alcohol, zinc oxide, bentonite having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol% and surfactants.

[15] The kit according to [14], further comprising iron oxide.

[16] The kit according to [14] or [15], which has at least one selected from the following group (A);

(A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate.

[17] A method for preparing coated rice seeds, the method comprising the steps of:

(1) While moving and rolling the rice seeds, polyvinyl alcohol, zinc oxide, bentonite, selected from the group (A) at least one and water to form a coating layer comprising said polyvinyl alcohol, zinc oxide, bentonite and at least one selected from the group (A) below,

(2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and

(3) a step of drying the seeds obtained in step (2);

(A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate.

[18] A method for preparing coated rice seeds, the method comprising the steps of:

(1) (I) While moving and rolling the rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, bentonite, a compound selected from the group (A) below is added at least one and water to form a coating layer comprising said polyvinyl alcohol, bentonite and at least one selected from the following (A) group, and (II) moving and rolling the obtained in step (I) a step of simultaneously adding the polyvinyl alcohol, zinc oxide, bentonite and water to the seed to form a coating layer comprising the polyvinyl alcohol, zinc oxide and bentonite on the outside of the layer formed by step (I),

(2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and

(3) a step of drying the seeds obtained in step (2);

(A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate.

[19] A coated rice seed prepared by the method according to [17] or [18].

[20] A method for preparing coated rice seeds, the method comprising the steps of:

(1) Add polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, while moving and rolling rice seeds, zinc oxide, iron oxide, bentonite, and water to form a Describe the step of the coating layer of polyvinyl alcohol, zinc oxide, iron oxide and bentonite,

(2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and

(3) A step of drying the seeds obtained in the step (2).

[21] A method for preparing coated rice seeds, the method comprising the steps of:

(1) (i) Add polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, while moving and rolling rice seeds, iron oxide, bentonite, and water to form a the steps of the coating layer of polyvinyl alcohol, iron oxide and bentonite, and (ii) adding said polyvinyl alcohol, zinc oxide, bentonite and water while moving and rolling the seeds obtained in step (i) to a step of forming a coating layer comprising said polyvinyl alcohol, zinc oxide and bentonite on the outside of the layer formed in step (i),

(2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and

(3) A step of drying the seeds obtained in the step (2).

[22] A coated rice seed prepared by the method according to [20] or [21].

(invention effect)

The coated rice seed of the present invention is less susceptible to bird damage, and prevents seed floating and a decrease in germination rate, and allows securing a sufficient seedling rate in rice direct-sowing cultivation.

Description of drawings

[ Fig. 1 ] A diagram illustrating a simple seed coating machine for coating rice seeds in Examples.

Ways of Carrying Out the Invention

The coated rice seed of the present invention (hereinafter, referred to as "this rice seed") has a coating layer characterized in that the coating layer comprises The degree of saponification of polyvinyl alcohol (hereinafter referred to as "this PVA"), zinc oxide, bentonite and surfactant, or the coating layer contains this PVA, zinc oxide and bentonite, and at least in the coating A surfactant remains on the surface of the layer.

Rice seeds as used herein are intended to mean seeds of commonly cultivated rice varieties.

Examples of the variety include species of Japonica subspecies and Indica subspecies, and varieties having high lodging resistance and high germination rate are preferable.

The present PVA as used herein is intended to mean a polymer compound having a structure represented by the following formula (1), wherein the degree of polymerization is 500 or more, and the degree of saponification is in the range of 71.0 mol% to 97.5 mol%.

In formula (1), m+n represents the degree of polymerization, and {m/(m+n)}×100 (mol%) represents the degree of saponification. The degree of polymerization of polyvinyl alcohol as used herein means the average degree of polymerization determined by calculation according to the test method of polyvinyl alcohol specified in JIS K6726-1994, and the degree of polymerization of the present PVA is preferably 500 to 3000, more preferably 1000 to 2500, still more preferably in the range of 1500 to 2500. The degree of saponification of polyvinyl alcohol as used herein means the degree of saponification determined by calculation according to the test method for polyvinyl alcohol specified in JIS K6726-1994, and the degree of saponification of the present PVA is preferably 78.5 mol % to 97.5 mol % , and more preferably in the range of 86.5 mol% to 97.5 mol%. The present PVA is commercially available, and examples of the commercially available present PVA include KURARAY POVAL PVA-220S (polymerization degree: 2000, saponification degree: 87.0 mol% to 89.0 mol%, manufactured by KURARAY CO., LTD. )), KURARAY POVAL PVA-205S (degree of polymerization: 500, degree of saponification: 86.5 mol% to 89.0 mol%, manufactured by Kuraray Co., Ltd.), and GOHSENOL GM-14S (degree of polymerization: 1000 to 1500, degree of saponification: 86.5 mol% to 89.0 mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.).

As used herein, powdery polyvinyl alcohol is preferably used, and polyvinyl alcohol having a particle size distribution in which the content of particles having a size of 180 μm or more is 0.5% or less is preferably used. "Particle size distribution of polyvinyl alcohol" as used herein means a particle size distribution measured using a sieving method, and "has a particle size distribution in which the content of particles having a size of 180 μm or more is 0.5% or less" as used herein means The weight ratio of the amount remaining on the 180 μm sieve to the total amount is 0.5% or less. The particle size distribution of polyvinyl alcohol can be obtained by placing 10 g of polyvinyl alcohol on a 180 μm mesh sieve (a test sieve defined by Japanese Industrial Standard (JIS) Z8801-1 and whose frame has a diameter of 200 mm and a depth of 45 mm), The polyvinyl alcohol was sieved with a sieving device such as a ro-tap shaker for 10 minutes, after which the weight of the polyvinyl alcohol remaining on the sieve was weighed, and the particle size distribution was calculated according to the following equation.

Amount remaining on the sieve (%) = weight of polyvinyl alcohol remaining on the sieve (g) / weight of polyvinyl alcohol placed on the sieve initially (g) x 100

The content of the present PVA in the present rice seeds is generally in the range of 0.01wt% to 5wt%, preferably 0.01wt% to 3wt%, more preferably 0.1wt% to 2wt%.

Zinc oxide as used herein is intended to mean the compound denoted ZnO, which may be commercially available zinc oxide. Examples of commercially available zinc oxide include zinc oxide 3N5 (manufactured by Kanto Chemical Co., Ltd.) and zinc oxide second grade (manufactured by Nippon Chemical Industry Co., Ltd.). Zinc oxide as used herein preferably has a purity of 99% or more (relative to the wt% of the zinc oxide). The purity of zinc oxide was determined using the test procedure specified in K1410 of Japanese Industrial Standards (JIS). In addition, powdery zinc oxide is generally used, and the average particle size of zinc oxide is in the range of 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 0.1 to 10 μm. The average particle size of zinc oxide as used herein means a particle size determined with a laser diffraction/scattering type particle size distribution analyzer, which is defined as a particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of zinc oxide can be measured by a method of dispersing particles of zinc oxide in water and then using Mastersizer 2000 (manufactured by Malvern Instruments Ltd) as a laser diffraction/scattering type particle size distribution analyzer (i.e., wet type measurement method) to determine.

The content of zinc oxide in the rice seeds is usually in the range of 0.005wt% to 80wt%, preferably 0.05wt% to 70wt%, more preferably 0.1wt% to 50wt%. The range of 0.1 wt% to 15 wt% is preferable in consideration of the influence on plant growth and the environment.

Bentonite as used herein is intended to mean a clay mainly composed of montmorillonite, which is classified as sodium bentonite containing sodium ions as the main cation in the interlayer of smectite and calcium ion in the interlayer of smectite Calcium bentonite as the main cation. Bentonite is commercially available, and examples of commercially available bentonites include bentonite HOTAKA (manufactured by HOJUN Co., Ltd.) and KUNIGEL V1 (manufactured by KUNIMINE INDUSTRIES CO., LTD.). As used herein, powdery bentonite is preferably used, and bentonite having a particle size distribution in which the content of particles having a size of 75 μm or more is 20% or less is preferably used. "Particle size distribution of bentonite" as used herein means a particle size distribution measured using a sieving method, and "having a particle size distribution in which the content of particles having a size of 75 μm or more is 20% or less" as used herein means remaining in The weight ratio of the amount on the 75 μm sieve to the total amount is 20% or less. The particle size distribution of bentonite can be obtained by placing 10 g of bentonite on a 75 μm mesh sieve (a test sieve defined by Japanese Industrial Standard (JIS) Z8801-1 and whose frame has a diameter of 200 mm and a depth of 45 mm), and the The bentonite was sieved with a ro-tap shaker for 10 minutes, after which the weight of the surfactant remaining on the sieve was weighed, and the particle size distribution was calculated according to the following equation.

Amount remaining on the sieve (%) = weight of bentonite remaining on the sieve (g) / weight of bentonite originally placed on the sieve (g) × 100

The content of bentonite in the present rice seeds is usually in the range of 0.01wt% to 10wt%, preferably 0.05wt% to 5wt%, more preferably 0.1wt% to 3wt%.

The surfactant as used herein is preferably at least one selected from the group consisting of nonionic surfactants and anionic surfactants, and more preferably selected from polyoxyethylene alkyl ethers, polyoxyethylene aromatic At least one of the group consisting of phenyl phenyl ether and sulfonate. In addition, polyoxyethylene aryl phenyl ether is preferably polyoxyethylene polystyryl phenyl ether, and the sulfonate is preferably selected from naphthalene sulfonate and its formaldehyde condensate, phenol sulfonate and its formaldehyde At least one of the group consisting of condensate and lignosulfonate.

Polyoxyethylene alkyl ethers include polyoxyethylene stearyl ether and polyoxyethylene tridecyl ether. Polyoxyethylene polystyryl phenyl ethers include polyoxyethylene tristyryl phenyl ethers. Naphthalenesulfonates and formaldehyde condensates thereof include formaldehyde condensates of sodium naphthalenesulfonate, phenolsulfonates and formaldehyde condensates thereof include formaldehyde condensates of sodium phenolsulfonate, and lignosulfonates include sodium lignosulfonate . Surfactants are commercially available, and for example, commercially available polyoxyethylene tristyryl phenyl ethers include SORPOL 5080 (manufactured by Toho Chemical Industry Co., Ltd.), and commercially available formaldehyde condensates of sodium naphthalenesulfonate include NEWKALGEN PS-P (Takemoto Oil Co., Ltd.).

As used herein, a powdery surfactant is preferably used, and a surfactant having a particle size distribution in which the content of particles having a size of 100 μm or more is 2% or less is preferably used. As used herein, "the particle size distribution of the surfactant" means a particle size distribution measured using a sieving method, and "having a particle size distribution in which the content of particles having a size of 100 μm or more is 2% or less" as used herein means The weight ratio of the amount remaining on the 100 μm sieve to the total amount is 2% or less. The particle size distribution of the surfactant can be obtained by placing 10 g of the surfactant on a 100 μm mesh sieve (a test sieve defined by Japanese Industrial Standard (JIS) Z8801-1 and whose frame has a diameter of 200 mm and a depth of 45 mm), The surfactant is sieved with a sieving device such as a ro-tap shaker for 10 minutes, after which the weight of the surfactant remaining on the sieve is weighed, and the particle size distribution is calculated according to the following equation.

Amount remaining on the sieve (%) = weight (g) of surfactant remaining on the sieve/weight (g) of surfactant initially placed on the sieve × 100

The content of the surfactant in the present rice seeds is usually in the range of 0.002wt% to 6wt%, preferably 0.005wt% to 2wt%, more preferably 0.01wt% to 2wt%.

The coating layer may contain at least one selected from group (A) (hereinafter, referred to as "the present inorganic compound"). Clays in the present inorganic compounds include pyrophyllite and kaolin. In addition, the present inorganic compound is preferably at least one selected from the group consisting of clay and calcium carbonate, and in particular, calcium carbonate is preferable due to good adhesion ability to rice seeds.

As used herein, the present inorganic compound is preferably used in powder form, and its average particle size is usually 200 μm or less, preferably 150 μm or less. The average particle size of the present inorganic compound as used herein means a particle size determined with a laser diffraction/scattering type particle size distribution analyzer, which is defined as a particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of the present inorganic compound can be measured by a method of dispersing particles of the present inorganic compound in water and then using Mastersizer 2000 (manufactured by Malvern Instruments Co., Ltd.) as a laser diffraction/scattering type particle size distribution analyzer (ie, a wet measurement method) to make sure.

When two or more inorganic compounds selected from group (A) having different average particle sizes are used as the present inorganic compound, the coating layer becomes a denser coating layer. Two or more inorganic compounds having different average particle sizes may be the same or different.

When the coating layer contains the present inorganic compound, its content in the present rice seed is generally in the range of 0.5wt% to 80wt%, preferably 1wt% to 70wt%, more preferably 5wt% to 50wt%.

The coating layer may contain pesticidally active ingredients. Examples of pesticidal active ingredients include insecticidal active ingredients, fungicidal active ingredients, herbicidal active ingredients and plant growth regulating active ingredients.

Examples of insecticidally active ingredients include clothianidin, imidacloprid, and thiamethoxam.

Examples of fungicidally active ingredients include isotianil and furametpyr.

Examples of herbicidally active ingredients include imazosulfuron and bromobutide.

Examples of plant growth regulating active ingredients include uniconazole P.

The powdery pesticidal active ingredient as used herein is preferably used, and the powdery pesticidal active ingredient may optionally be mixed with the present inorganic compound by grinding with a mill such as a dry mill to be used as a powdery pesticide. The average particle size of the powdered pesticide is usually 200 μm or less, preferably 150 μm or less. The average particle size of a powdered pesticide as used herein means a particle size determined with a laser diffraction/scattering type particle size distribution analyzer, which is defined as a particle size corresponding to 50% accumulation in a volume-based frequency distribution. When the powdery pesticide is mixed with the present inorganic compound, the average particle size of the powdery pesticide means the average particle size of the mixture. The average particle size of the powdered pesticide can be measured by a method of dispersing particles of the powdered pesticide in water and then using Mastersizer 2000 (manufactured by Malvern Instruments Co., Ltd.) as a laser diffraction/scattering type particle size distribution analyzer (ie, a wet measurement method) to make sure.

When the coating layer contains pesticide active ingredients, its content in the rice seeds is usually in the range of 0.001wt% to 3wt%, preferably 0.005wt% to 2wt%, more preferably 0.01wt% to 2wt%.

The coating layer may contain a coloring agent. Examples of the colorant include pigments, dyes and dye stuffs, and in particular, pigments are preferable. The pigment is preferably a red or blue pigment such as Ultramarine Blue Nubix G-58 (blue pigment, manufactured by nubiola Inc.) and TODACOLOR-300R (red pigment, manufactured by Toda Kogyo Co., Ltd.).

The ingredients for preparing the present rice seeds may be used separately, or all or at least two kinds of ingredients may be used in combination. The kit of the present invention (hereinafter, referred to as "the present kit") has the present PVA, zinc oxide, bentonite, and surfactant, which may be contained in one container or may be contained in two or more containers. That is, the kit may include one or more containers. When the kit includes more than two containers, each container may contain different components. In addition, the present kit may include other ingredients such as iron oxide, the present inorganic compound, and an agrochemical active ingredient (hereinafter, referred to as "ingredient α").

The present rice seed can be obtained by forming a coating layer (hereinafter referred to as "the present coating layer 1") comprising the present PVA, zinc oxide, bentonite and surfactant and optionally including iron oxide or the present inorganic compound on the rice seed. ) or form a layer comprising the present PVA, zinc oxide and bentonite and optionally iron oxide or the present inorganic compound (hereinafter, referred to as "the present coating layer 2") on rice seeds and then make the surfactant Keep on the surface of this coating layer 2 to prepare.

The present coating layer 1 is formed by performing a step of adding present PVA, zinc oxide, bentonite and surfactant and optionally iron oxide or present inorganic compound to attach them to the rice seeds while moving and rolling the rice seeds. The present coating layer 2 is formed by performing a step of adding present PVA, zinc oxide and bentonite and optionally adding iron oxide or present inorganic compound to attach them to the rice seeds while moving and rolling the rice seeds. As a device for moving and rolling rice seeds, a machine commonly used in iron coating such as a coating machine can be used. The present PVA, zinc oxide, bentonite, and surfactant and optionally iron oxide or the present inorganic compound may be used separately, or all or at least two of the components may be used in combination. When using all ingredients in admixture, a powdered composition comprising the present PVA, zinc oxide, bentonite and surfactant and optionally iron oxide or the present inorganic compound is used. When at least two components are used in combination, for example, a powdery composition comprising the present PVA, zinc oxide and bentonite and optionally iron oxide or the present inorganic compound, and a surfactant is used. In addition, when component α is used, component α may be used alone, or may be added to a powder composition containing the present PVA, zinc oxide, and bentonite, and optionally iron oxide or the present inorganic compound.

A method for forming the present coating layer 2 using a powder composition (hereinafter, referred to as "powder composition Z") comprising the present PVA, zinc oxide, and bentonite (hereinafter, referred to as "powder composition Z") and a surfactant, and then keeping the surfactant at its superficial approach.

The powdery composition Z and water were added while moving and rolling the rice seeds to form the present coating layer 2 on the rice seeds. The present PVA allows the attachment of zinc oxide and bentonite to rice seeds by acting as a binder. A preferred embodiment of the present rice seed is one in which the surfactant is kept at least on its surface, and the surfactant is kept on the surface by allowing the present coating layer 2 to be formed on the rice seed and then kept moving And add surfactant while rolling the state of rice seed so that surfactant is attached to the outside of this coating layer 2 and realize.

When the present inorganic compound is used, the present inorganic compound and the powdery composition Z may be mixed and added in the aforementioned method, or a powdery composition (hereinafter referred to as "powdered combination") comprising the present PVA, bentonite and the present inorganic compound may be prepared. Substance Y") and powdered composition Z, and then add the compounds separately in the preceding method.

When added separately, the rice seed having the first layer comprising the present inorganic compound and the second layer comprising zinc oxide coated on the outside of the first layer can be obtained by first adding the powdery composition Y, and then adding the powdery composition Y. Substance Z is prepared. Specifically, powdery composition Y and water were added while moving and rolling the rice seeds to form the first layer comprising the present inorganic compound, the present PVA and bentonite, and the powder was added while maintaining the state of moving and rolling the rice seeds Composition Z and water were used to form a second layer comprising zinc oxide, present PVA and bentonite on the outside of the first layer.

A powdery composition (hereinafter, sometimes referred to as "this composition (1)") containing the present PVA, zinc oxide, and bentonite is suitable as a powdery composition for coating rice seeds. The average particle size of the present composition (1) is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 5 to 150 μm. The average particle size of the present composition (1) as used herein means a particle size determined with a laser diffraction/scattering type particle size distribution analyzer, which is defined as a particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of the present composition (1) can be measured by dispersing the particles of the present composition (1) in water and then using Mastersizer 2000 (manufactured by Malvern Instrument Co., Ltd.) as a laser diffraction/scattering type particle size distribution analyzer ( That is, wet measurement method) to determine.

The apparent relative density of the composition (1) is, for example, in the range of 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.50 to 2.0 g/mL, more preferably 0.60 to 1.7 g/mL. The apparent relative density of the present composition (1) is preferably high because dispersion is prevented in the preparation of coated rice seeds. As used herein, the apparent relative density of the present composition (1) was determined according to the test procedure specified in the official analysis method of pesticides (physical test, Ministry of Agriculture and Forestry Announcement No. 71, February 3, 1971 (physical test, Notice No.71 of Ministry of Agriculture and Forestry on February 3, Showa 35)) method to determine. The method involves placing a standard sieve having 8 meshes (a test sieve whose frame has a diameter of 200 mm and a depth of 45 mm specified in Z8801-1 of Japanese Industrial Standards (JIS)) in a metal sieve having an inner diameter of 50 mm. On a cylindrical container with a capacity of 100 mL, the sample is placed in a sieve and gently swept with a brush to fill the container. Then, the excess sample was immediately scraped off using a glass slide, and then the sample was weighed to determine the weight of the content and calculate the apparent relative density according to the following equation. The distance between the sieve and the upper edge of the container was set at 20 cm.

Apparent relative density (g/mL) = weight of content/100

The present composition (1) may contain the present inorganic compound. When the present composition (1) contains the present inorganic compound, the weight ratio of the zinc oxide in the present composition (1) to the present inorganic compound is usually 1:1000 to 1000:1, preferably 1:1000 to 100:1, more preferably Preferably in the range of 1:200 to 10:1. The range of 1:200 to 1:3 is preferable in consideration of the influence on plant growth and the environment.

A method for forming the present coating layer 2 using a powder composition (hereinafter, referred to as "powder composition T") and a surfactant comprising the present PVA, zinc oxide, iron oxide, and bentonite, and then making the surface active is described below. The method by which the agent is retained on its surface.

The powdery composition T and water were added while moving and rolling the rice seeds to form the present coating layer 2 on the rice seeds. The present PVA allows the attachment of zinc oxide, iron oxide and bentonite to rice seeds by acting as a binder. A preferred embodiment of the present rice seed is one in which the surfactant is kept at least on its surface, and the surfactant is kept on the surface by allowing the present coating layer 2 to be formed on the rice seed, and then while keeping moving and In the state of rolling rice seeds, a surfactant is added so that the surfactant adheres to the outside of the coating layer 2 .

When iron oxide and zinc oxide are used respectively to form the present coating layer, the rice seeds having the first layer containing iron oxide and the second layer containing zinc oxide coated on the outside of the first layer can be obtained by first adding the present coating layer. PVA is then prepared by adding zinc oxide. Specifically, the composition comprising iron oxide and the present PVA and water are added while moving and rolling the rice seeds to form the first layer comprising iron oxide and the present PVA, and are added while maintaining the state of moving and rolling the rice seeds A composition comprising zinc oxide and the present PVA and water to form a second layer comprising zinc oxide and the present PVA on the outside of the first layer.

A powdery composition (hereinafter, sometimes referred to as "this composition (2)") containing the present PVA, zinc oxide, iron oxide, and bentonite is suitable as a powdery composition for coating rice seeds. The average particle size of the present composition (2) is in the range of 0.01 to 150 μm, preferably 1 to 150 μm, more preferably 1 to 60 μm. The average particle size of the present composition (2) as used herein means a particle size determined with a laser diffraction/scattering type particle size distribution analyzer, which is defined as a particle size corresponding to 50% accumulation in a volume-based frequency distribution. The average particle size of the present composition (2) can be measured by dispersing the particles of the present composition (2) in water and then using Mastersizer 2000 (manufactured by Malvern Instruments Co., Ltd.) as a laser diffraction/scattering type particle size distribution analyzer ( That is, wet measurement method) to determine.

The apparent relative density of the composition (2) is, for example, in the range of 0.30 to 2.50 g/mL and 0.30 to 2.0 g/mL, preferably 0.30 to 2.20 g/mL, more preferably 0.50 to 2.20 g/mL. The apparent relative density of the present composition (2) is preferably high because dispersion is prevented in the preparation of coated rice seeds. As used herein, the apparent relative density of the present composition (2) was determined according to the test procedure specified in the official analysis method of pesticides (physical test, Ministry of Agriculture and Forestry Announcement No. 71, February 3, 1971 (physical test, Notice No.71 of Ministry of Agriculture and Forestry on February 3, Showa 35)) method to determine. The method involves placing a standard sieve having 8 meshes (a test sieve whose frame has a diameter of 200 mm and a depth of 45 mm specified in Z8801-1 of Japanese Industrial Standards (JIS)) in a metal sieve having an inner diameter of 50 mm. On a cylindrical container with a capacity of 100 mL, the sample is placed in a sieve and gently swept with a brush to fill the container. Then, the excess sample was immediately scraped off using a glass slide, and then the sample was weighed to determine the weight of the content and calculate the apparent relative density according to the following equation. The distance between the sieve and the upper edge of the container was set at 20 cm.

Apparent relative density (g/mL) = weight of content/100

The weight ratio of zinc oxide to iron oxide in the present composition (2) is generally in the range of 1:1000 to 1000:1, preferably 1:1000 to 100:1, more preferably 1:200 to 10:1. The range of 1:200 to 1:3 is preferable in consideration of the influence on plant growth and the environment.

Some examples of the present composition (1) are described below. In the following examples, % represents wt% relative to the present composition (1).

A powder comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate A shape composition, wherein the average particle size is 0.01 to 150 μm, and the apparent relative density is 0.30 to 2.0 g/mL;

A powder comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate A shape composition, wherein the average particle size is 1 to 150 μm, and the apparent relative density is 0.50 to 2.0 g/mL;

A powder comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of clay and calcium carbonate A shape composition, wherein the average particle size is 5 to 150 μm, and the apparent relative density is 0.60 to 1.7 g/mL;

A compound comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate Powdered compositions, wherein the average particle size is 0.01 to 150 μm, and the apparent relative density is 0.30 to 2.0 g/mL;

A compound comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate Powdered compositions, wherein the average particle size is 1 to 150 μm, and the apparent relative density is 0.50 to 2.0 g/mL;

A compound comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite, and at least one selected from the group consisting of pyrophyllite and calcium carbonate Powdered compositions wherein the average particle size is from 5 to 150 μm and the apparent relative density is from 0.60 to 1.7 g/mL;

A powdery composition comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite and calcium carbonate, wherein the average particle size is 5 to 150 μm, And the apparent relative density is 0.60 to 1.7g/mL;

A polyvinyl alcohol comprising 0.5% to 60% of zinc oxide, 0.5% to 3% of polyvinyl alcohol having a degree of polymerization of A powdered composition of bentonite and 32% to 98% calcium carbonate, wherein the average particle size is 5 to 50 μm and the apparent relative density is 0.80 to 1.5 g/mL;

A polyvinyl alcohol comprising 2% to 50% of zinc oxide, 0.5% to 3% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 1% to 5% of bentonite and Powdered compositions of 42% to 86.5% calcium carbonate, wherein the average particle size is 15 to 45 μm and the apparent relative density is 1.0 to 1.3 g/mL;

A powdered combination comprising 48.3% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 2.4% of bentonite and 48.3% of calcium carbonate objects, wherein the average particle size is 16.4 μm;

A powdered combination comprising 24.1% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 2.4% of bentonite and 72.5% of calcium carbonate objects, wherein the average particle size is 24.6 μm;

A powdered combination comprising 4.8% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 2.4% of bentonite and 91.8% of calcium carbonate matter, wherein the average particle size is 42.7 μm, and the apparent relative density is 1.2 g/mL;

A powdery composition comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, bentonite and clay, wherein the average particle size is 5 to 150 μm, and The apparent relative density is 0.60 to 1.7g/mL;

A powdery composition comprising zinc oxide, polyvinyl alcohol having a degree of polymerization of 1500 to 2500 and a degree of saponification in the range of 86.5 mol % to 97.5 mol %, bentonite and pyrophyllite, wherein the average particle size is 5 to 150 μm , and the apparent relative density is 0.60 to 1.7 g/mL;

A kind comprising 1% to 15% of zinc oxide, 0.5% to 3% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 1% to 5% of bentonite and A powdered composition of 77% to 97.5% pyrophyllite, wherein the average particle size is 1 to 30 μm and the apparent relative density is 0.60 to 1.2 g/mL; and

A powder comprising 9.6% of zinc oxide, 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 2.4% of bentonite and 87% of pyrophyllite A composition wherein the average particle size is 22.5 μm.

Some examples of the present composition (2) are described below. In the following examples, % represents wt% relative to the present composition (2).

A powdery composition comprising polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 mol% to 97.5 mol%, zinc oxide, iron oxide and bentonite, wherein the average particle size is 1 to 60 μm, And the apparent relative density is 0.50 to 2.20 g/mL;

A polyvinyl alcohol comprising 0.5% to 3% of polyvinyl alcohol having a degree of polymerization of 500 to 3000 and a degree of saponification in the range of 78.5 mol% to 97.5 mol%, 1% to 60% of zinc oxide, 32% to 97.5% of A powdered composition of iron oxide and 1% to 5% bentonite, wherein the average particle size is 5 to 60 μm and the apparent relative density is 1.00 to 2.20 g/mL;

A polyvinyl alcohol comprising 0.5% to 3% having a degree of polymerization of 1000 to 2500 and a degree of saponification in the range of 86.5 mol% to 97.5 mol%, 3% to 50% of zinc oxide, 42% to 95.5% of A powdered composition of iron oxide and 1% to 5% bentonite, wherein the average particle size is 15 to 50 μm and the apparent relative density is 1.20 to 2.20 g/mL;

A powdery combination comprising 1.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 48.3% of zinc oxide, 48.3% of iron oxide and 2.4% of bentonite objects, wherein the average particle size is 11.6 μm;

A powdery combination comprising 2.0% of polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification in the range of 87.0 mol% to 89.0 mol%, 9.5% of zinc oxide, 86.1% of iron oxide and 2.4% of bentonite matter, wherein the average particle size is 11.2 μm, and the apparent relative density is 1.77 g/mL; and

A powdery composition comprising 1.0% polyvinyl alcohol having a degree of polymerization of 2000 and a degree of saponification ranging from 87.0 mol% to 89.0 mol%, 4.8% zinc oxide, 91.8% iron oxide and 2.4% bentonite, wherein the average The particle size was 20.2 μm, and the apparent relative density was 2.01 g/mL.

A method for preparing the present rice seed (hereinafter, referred to as "the present preparation method") is described. In this preparation method, rice seeds are usually soaked before use. Soaking can be achieved as follows. First, dry rice seeds are placed in a bag such as a rice seed bag and soaked in water. The seeds are preferably soaked in water at 15 to 20°C for three to four days to produce coated rice seeds with a high germination rate. The rice seeds are recovered from the water and then usually left to stand or spin dried to remove excess moisture on the surface.

First, a method for preparing coated rice seeds having a coating layer comprising the present PVA, zinc oxide, bentonite and the present inorganic compound, wherein a surfactant remains on the surface of the layer (hereinafter referred to as as "Preparation Method 1"). This preparation method 1 comprises the following steps.

(1) a step of adding the present PVA, zinc oxide, bentonite, the present inorganic compound and water to form a coating layer comprising the present PVA, zinc oxide, bentonite and the present inorganic compound while moving and rolling the rice seeds, (2) in A step of adding a surfactant to keep the surfactant on the outside of the coating layer formed by the step (1) while moving and rolling the rice seeds obtained in the step (1), and (3) drying the rice seed obtained in the step (2) The step of the rice seed obtained in ).

For this production method 1, first, adding a powdery composition (hereinafter, referred to as "powdery composition X") comprising the present PVA, zinc oxide, bentonite, and the present inorganic compound while moving and rolling the soaked rice seeds is carried out. ) and water to form a coating layer comprising the present PVA, zinc oxide, bentonite and the present inorganic compound (hereinafter, referred to as "step 1"). In step 1, the water can be added first, then the powdered composition X can be added, and the order can be reversed. In addition, water and powdered composition X can be added simultaneously. Water and powdered composition X were added while continuing to contact the rice seeds in a moving and rolling state. The method of adding water may include dropping and spraying. After adding water and powdery composition X, zinc oxide, bentonite, and the present inorganic compound were attached to rice seeds kept in a moving and rolling state by using the present PVA as a binder.

The total amount of zinc oxide added in the preparation method 1 is usually in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, relative to 100 parts by weight of dry rice seeds. Considering the influence on plant growth and environment, the preferred range is 0.1 to 25 parts by weight. The total addition amount of the present inorganic compound is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, relative to 100 parts by weight of dry rice seeds. The total addition amount of the powdery composition X is usually in the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, relative to 100 parts by weight of dry rice seeds. The total amount of the present PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, relative to 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powder composition X is usually in the range of 1:200 to 1:10, preferably 1:150 to 1:20.

In step 1, a uniform coating layer can be formed by dividing and adding powdered composition X and repeating step 1. In this case, the single addition amount of the powdery composition X is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total addition amount of the powdery composition X. The total addition amount of water is usually about 1/2 to 1/100, preferably about 1/3 to 1/10 of the total addition amount of the powdery composition X.

In step 1, when the powdery composition X is attached to the inner wall of the device, nearly the entire amount of the added powdery composition X can be attached to the rice seeds by scraping off the powdery composition X with a spatula or the like.

After performing Step 1, a step of adding a surfactant to keep the surfactant on the outside of the coating layer formed by Step 1 while moving and rolling the seeds obtained in Step 1 (hereinafter, referred to as " Step 2"). For step 2, after performing step 1, adding the surfactant while maintaining the state of moving and rolling the rice seeds can keep the surfactant on the outside of the coating layer comprising the present PVA, zinc oxide, bentonite and the present inorganic compound.

After performing step 2, the present seed is obtained by performing a step of drying the seed obtained in step 2. Specifically, after performing step 2, the rice seeds are recovered from the device, placed in a seedling box so that the rice seeds are sparsely spread therein, and allowed to dry. The rice seeds are usually dried to a water content below 20% (wt% relative to the coated rice seeds). The water content of the coated rice seeds as used herein means a value measured by drying 10 g of a sample at 105° C. for one hour, using an infrared moisture meter. FD-610 manufactured by Kett Electric Laboratory can be used as an infrared moisture meter. In addition, straw mats or plastic boards can be used instead of seedling boxes to spread thinly on them and allow them to dry.

Next, a method for preparing a coated rice seed having a coating layer comprising the present PVA, zinc oxide, bentonite and the present inorganic compound, wherein the coating layer has a first layer containing the present inorganic compound and coating A second layer comprising zinc oxide on the outside of the first layer, and a surfactant remained on its surface (hereinafter, referred to as "present production method 2"). This preparation method 2 comprises the following steps.

(1) (I) a step of adding present PVA, bentonite, present inorganic compound, and water to form a coating layer comprising present PVA, bentonite, and present inorganic compound while moving and rolling rice seeds, and (II) moving and rolling A step of adding the present PVA, zinc oxide, bentonite and water while rolling the seeds obtained in the step (I) to form a coating layer comprising the present PVA, zinc oxide and bentonite on the outside of the layer formed by the step (I), (2) a step of adding a surfactant to keep the surfactant on the outside of the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and (3) drying in the step ( Step 2) for the seeds obtained.

For this production method 2, first, adding a powdery composition (hereinafter, referred to as "powdery composition W") and water containing the present PVA, bentonite, and present inorganic compound while moving and rolling soaked rice seeds is carried out. A step of forming a coating layer comprising the present PVA, bentonite and the present inorganic compound (hereinafter, referred to as "step I"). Step I can be performed according to a procedure similar to Step 1 in the present Production Method 1, except that powdery composition W is used instead of powdery composition X. After performing Step I, adding a powdery composition comprising the present PVA, zinc oxide and bentonite (hereinafter, referred to as "powdery composition V") and water while moving and rolling the seeds obtained in Step I was carried out. A step of forming a coating layer comprising the present PVA, zinc oxide and bentonite on the outside of the layer formed by the step I (hereinafter, referred to as "step II"). Step II can be performed according to a procedure similar to Step I, except that powdered composition V is used instead of powdered composition W.

The total amount of iron oxide added in the present preparation method 2 is usually in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, relative to 100 parts by weight of dry rice seeds. The range of 0.1 to 25 parts by weight is preferable in consideration of effects on plant growth and the environment. The total addition amount of the present inorganic compound is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, relative to 100 parts by weight of dry rice seeds. The total amount of powdery composition V added is usually in the range of 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, relative to 100 parts by weight of dry rice seeds. The total addition amount of the powdery composition W is usually in the range of 5 to 250 parts by weight, preferably 5 to 200 parts by weight, more preferably 5 to 150 parts by weight, relative to 100 parts by weight of dry rice seeds. The total amount of the present PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, relative to 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powdery composition V is generally in the range of 1:200 to 1:10, preferably 1:150 to 1:20. The weight ratio of the present PVA to the powder composition W is usually in the range of 1:200 to 1:10, preferably 1:1500 to 1:20.

After performing Step II, Step 2 or subsequent steps in this Preparation Method 1 are similarly performed.

Next, a method for producing coated rice seeds having the present coating layer 2 in which a surfactant remains on the surface of the layer (hereinafter, referred to as "present production method 3") is described. The preparation method 3 includes the following steps.

(1) The step of adding the present PVA, zinc oxide, iron oxide, bentonite and water to form the present coating layer 2 while moving and rolling the rice seeds, (2) moving and rolling the rice obtained in step (1) A step of simultaneously adding a surfactant to the seeds so as to keep the surfactant outside the coating layer formed by the step (1), and (3) a step of drying the rice seeds obtained in the step (2).

For the present production method 3, first, a step of adding the powdery composition Z and water to form the present coating layer 2 while moving and rolling soaked rice seeds (hereinafter, referred to as "step 1'") was performed. In step 1', the water can be added first, then the powdered composition T can be added, and the order can be reversed. In addition, water and powdered composition T can be added simultaneously. Water and powdered composition T are added while continuing to contact the rice seeds in a moving and rolling state. The method of adding water may include dropping and spraying. After adding water and powdery composition T, zinc oxide, iron oxide and bentonite were attached to rice seeds kept in a moving and rolling state by using the present PVA as a binder.

The total amount of zinc oxide added in the preparation method 3 is generally in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, relative to 100 parts by weight of dry rice seeds. Considering the influence on plant growth and environment, the preferred range is 0.1 to 25 parts by weight. The total amount of iron oxide added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, relative to 100 parts by weight of dry rice seeds. The total addition amount of the powdery composition T is usually in the range of 5 to 500 parts by weight, preferably 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, relative to 100 parts by weight of dry rice seeds. The total amount of the present PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, relative to 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powdery composition T is usually in the range of 1:200 to 1:10, preferably 1:150 to 1:20.

In step 1', a uniform coating layer can be formed by dividing and adding the powdery composition T and repeating step 1'. In this case, the single addition amount of the powdery composition T is usually about 1 to 1/10, preferably about 1/2 to 1/5 of the total addition amount of the powdery composition T. The total addition amount of water is usually about 1/2 to 1/100, preferably about 1/3 to 1/10 of the total addition amount of the powdery composition T.

In step 1', when the powdery composition T is attached to the inner wall of the device, nearly the entire amount of the added powdery composition T can be attached to the rice seeds by scraping off the powdery composition T with a spatula or the like.

After performing step 1', a step of adding a surfactant to keep the surfactant on the outside of the present coating layer 2 formed by step 1' while moving and rolling the seeds obtained in step 1' (below Herein, referred to as "step 2'"). For step 2', after performing step 1', adding the surfactant while maintaining the state of moving and rolling the rice seeds allows keeping the surfactant on the outside of the present coating layer 2.

After performing step 2', the present rice seeds are obtained by performing a step of drying the seeds obtained in step 2'. Specifically, after performing step 2', the rice seeds are recovered from the device, placed in a seedling box so that the rice seeds are sparsely spread therein, and allowed to dry. The rice seeds are usually dried to a water content below 20% (wt% relative to the coated rice seeds). The water content of the coated rice seeds as used herein means a value measured by drying 10 g of a sample at 105° C. for one hour, using an infrared moisture meter. FD-610 manufactured by Kett Electric Laboratory can be used as an infrared moisture meter. In addition, straw mats or plastic boards can be used instead of seedling boxes to spread thinly on them and allow them to dry.

Next, a method for producing a coated rice seed having the present coating layer 2 having a first layer comprising iron oxide and a layer comprising zinc oxide coated on the outside of the first layer is described. The second layer, and the surfactant remained on its surface (hereinafter, referred to as "this preparation method 4"). This preparation method 4 comprises the following steps.

(1') (i) a step of adding present PVA, iron oxide, bentonite and water to form a coating layer comprising present PVA, iron oxide and bentonite while moving and rolling rice seeds, and (ii) moving and rolling The step ( 2') a step of adding a surfactant to keep the surfactant on the outside of the layer formed by the step (1') while moving and rolling the seeds obtained in the step (1'), and (3') drying The step of the seed obtained in step (2').

For this production method 4, first, adding a powdery composition (hereinafter, referred to as "powdery composition S") and water comprising the present PVA, iron oxide, and bentonite while moving and rolling the soaked rice seeds to A step of forming a coating layer comprising the present PVA, iron oxide, and bentonite (hereinafter, referred to as "step i"). Step i can be carried out according to a procedure similar to step 1' in this production method 4, except that powdery composition S is used instead of powdery composition T. After performing step i, adding a powder composition comprising the present PVA, zinc oxide and bentonite (hereinafter referred to as "powder composition R") and water while moving and rolling the seeds obtained in step i A step of forming a coating layer comprising the present PVA, zinc oxide and bentonite on the outside of the layer formed by step i (hereinafter, referred to as "step ii"). Step ii can be performed according to a procedure similar to step i, except that powdered composition R is used instead of powdered composition S.

The total amount of zinc oxide added in the present preparation method 4 is usually in the range of 0.01 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, relative to 100 parts by weight of dry rice seeds. The range of 0.1 to 25 parts by weight is preferable in consideration of effects on plant growth and the environment. The total amount of iron oxide added is usually in the range of 1 to 200 parts by weight, preferably 1 to 150 parts by weight, more preferably 1 to 100 parts by weight, relative to 100 parts by weight of dry rice seeds. The total addition amount of the powdery composition S is usually in the range of 5 to 250 parts by weight, preferably 5 to 150 parts by weight, more preferably 5 to 100 parts by weight, relative to 100 parts by weight of dry rice seeds.

The total addition amount of the powdery composition R is usually in the range of 0.1 to 250 parts by weight, preferably 1 to 120 parts by weight, more preferably 1 to 60 parts by weight, relative to 100 parts by weight of dry rice seeds. The total amount of the present PVA added is usually in the range of 0.025 to 25 parts by weight, preferably 0.025 to 8 parts by weight, more preferably 0.05 to 4 parts by weight, relative to 100 parts by weight of dry rice seeds. The weight ratio of the present PVA to the powder composition S is usually in the range of 1:200 to 1:10, preferably 1:150 to 1:20. The weight ratio of the present PVA to the powder composition R is generally in the range of 1:200 to 1:10, preferably 1:150 to 1:20.

After performing Step II, Step 2' or subsequent steps in this Production Method 3 are similarly performed.

The rice seed can be used for direct sowing and cultivation of paddy, and the method is carried out by directly sowing the rice seed into a paddy field. A paddy field as used herein means any of a flooded paddy field and a drained paddy field. Specifically, according to Minoru YAMAUCHI, "A manual for direct sowing of iron-coated rice on a flooded paddy field 2010 (2010 manual for direct sowing of iron-coated rice on a flooded paddy field)", The National Agriculture and Food Research Organization, Western Region Agricultural Research Center, March 2010 for seeding. In this case, a direct seeder for iron coating such as Tetsumakichan (manufactured by Kubota Corporation) can be used. Sowing with this conventional method allows to achieve good seedling emergence. After sowing, maintaining normal cultivation conditions allows cultivation of rice.

Agrochemicals and fertilizers can be applied before, simultaneously with, or after sowing. Agrochemicals include fungicides, insecticides, and herbicides, among others.

Example

The present invention is described in more detail by way of examples.

First, Preparation Examples and Comparative Preparation Examples are described.

In the following Preparation Examples and Comparative Preparation Examples, unless otherwise specified, seeds of the hinohikari variety were used as rice seeds, and iron oxide having an average particle size of 42.7 μm and whose α-Fe ₂ O ₃ content was 78% was used. The preparation method is carried out at room temperature (about 20°C). In addition, % represents wt%.

In addition, the trade names used in the preparation examples and comparative preparation examples are as follows.

LPZINC-20: zinc oxide, manufactured by Sakai Chemical Industry Co., Ltd., average particle size: 27.4 μm

Zinc oxide 3N5: Zinc oxide, manufactured by Kanto Chemical Co., Ltd., average particle size: 7.7 μm

Zinc Oxide Second Grade: Zinc Oxide, manufactured by Nippon Chemical Industry Co., Ltd., average particle size: 0.24μm

Calcium carbonate G-100: Calcium carbonate, manufactured by Sankyo Seishin Co., Ltd., average particle size: 46.0 μm

Calcium carbonate for granules: Calcium carbonate, manufactured by Yasen Lime Co., Ltd., average particle size: 6.2 μm

DL clay for powder: pyrophyllite, manufactured by Katsumitsuyama Mining Co., Ltd., average particle size: 30.3 μm

Rutile powder: Titanium oxide, manufactured by KINSEI MATEC CO., LTD., average particle size: 14.6 μm

Sun Zeolite MGF: Zeolite, manufactured by Sun Zeolite Industry Co., Ltd., average particle size: 116 μm

SHOKOZAN CLAY S: Pyrophyllite, manufactured by Katsukozan Mining Co., Ltd.

Bentonite HOTAKA: Montmorillonite, manufactured by HOJUN Co., Ltd.

DAE1K: Iron powder, manufactured by DOWA IP CREATION CO., LTD.

KTS-1: Calcined gypsum, manufactured by Yoshino Gypsum Sales Co., Ltd.

KURARAY POVAL PVA-220S: polyvinyl alcohol, degree of saponification: 87.0 mol% to 89.0 mol%, degree of polymerization: 2000, manufactured by Kuraray Co., Ltd.

GOHSENOL GM-14S: polyvinyl alcohol, degree of saponification: 86.5 mol% to 89.0 mol%, degree of polymerization: 1000 to 1500, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.

KURARAY POVAL PVA-205S: polyvinyl alcohol, degree of saponification: 86.5 mol% to 89.0 mol%, degree of polymerization: 500, manufactured by Kuraray Co., Ltd.

KURARAY POVAL PVA-224S: polyvinyl alcohol, degree of saponification: 87.0 mol% to 89.0 mol%, degree of polymerization: 2400, manufactured by Kuraray Co., Ltd.

SORPOL5080: polyoxyethylene tristyryl phenyl ether, manufactured by Toho Chemical Industry Co., Ltd.

Preparation Example 1

First, a simple seed coating machine for coating a small amount of rice seeds was manufactured. As shown in Fig. 1, the simple seed coating machine is manufactured by fixing a cup 2 made of polyethylene with a capacity of 500 mL to the top end of a shaft 1, inserting it into an agitator 3 (Three-One Motor, produced by New East Scientific Co., Ltd.), and fixed it on the bracket 4 so that the agitator 3 can be tilted at an elevation angle of 45 degrees.

Then, 2 g of zinc oxide second grade, 0.2 g of GOHSENOL GM-14S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (1).

To a cup having a capacity of 200 mL made of polyethylene, about 100 mL of water was poured, and 20 g of dried rice seeds were added thereto, followed by soaking for 10 minutes. The rice seeds were then recovered from the water, and excess water adhering to the surface was removed, and then the rice seeds were loaded into a cup 2 made of polyethylene fixed to the manufactured simple seed coating machine. The simple seed coating machine works in the range of 130 to 140 rpm in the mixer 3 to move and roll the rice seeds, and then spray 2.45 g of powdered composition (1) while spraying water to the rice seeds with a sprayer. About a quarter (about 0.6 g) was added to the rice seeds to attach the powdered composition (1 ) to the rice seeds. When the powdery composition (1) is attached to the inner wall of the cup 2 made of polyethylene, nearly the entire amount of the single-addition powdery composition (1) is attached by scraping off the powdery composition (1) with a spatula to rice seeds. By repeating a similar process three times, 2.45 g of the powdery composition (1) was attached to rice seeds to form a coating layer. The total amount of water used in the coating was 2.4 g. Then, 0.1 g of SORPOL 5080 was added to the rice seeds to adhere to the outside of the coating layer under the condition of moving and rolling the rice seeds by keeping the simple seed coating machine working. The coated rice seeds recovered from the simple seed coating machine were spread on stainless steel trays so as not to overlap, and dried overnight to obtain the coated rice seeds (1) of the present invention.

Preparation example 2

Two grams of zinc oxide second grade, 0.1 g of KURARAY POVAL PVA-205S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (2).

The following method was carried out according to the method described in Preparation Example 1. By using the above 2.35 g of powdered composition (2) instead of 2.45 g of powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (2) of the present invention. The total amount of water used in the coating was 0.5 g.

Preparation example 3

Ten grams of LPZINC-20, 0.1 g of KURARAY POVAL PVA-224S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (3).

The following method was carried out according to the method described in Preparation Example 1. By using the above 10.35 g of the powdered composition (3) instead of 2.45 g of the powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (3) of the present invention. The total amount of water used in the coating was 1.4 g.

Preparation Example 4

Five grams of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (4). The average particle size of the powdered composition (4) was 16.4 μm.

The following method was carried out according to the method described in Preparation Example 1. By using the above 10.35 g of the powdered composition (4) instead of 2.45 g of the powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (4) of the present invention. The total amount of water used in the coating was 2.8 g.

Preparation Example 5

Ten grams of zinc oxide 3N5, 10 g of granulated calcium carbonate, 0.2 g of KURARAY POVAL PVA-220S and 0.5 g of bentonite HOTAKA were mixed to obtain a powdery composition (5). The average particle size of the powdered composition (5) is 8.2 μm.

The following method was carried out according to the method described in Preparation Example 1. By using the above 20.7 g of the powdered composition (5) instead of 2.45 g of the powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (5) of the present invention. The total amount of water used in the coating was 5.6 g.

Preparation Example 6

Twenty grams of zinc oxide 3N5, 20 g of granulated calcium carbonate, 0.4 g of KURARAY POVAL PVA-220S and 1.0 g of bentonite HOTAKA were mixed to obtain a powdery composition (6). The average particle size of the powdered composition (6) is 8.2 μm.

The following method was carried out according to the method described in Preparation Example 1. By using 41.4 g of the above powder composition (6) instead of 2.45 g of the powder composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (6) of the present invention. The total amount of water used in the coating was 10.3 g.

Preparation Example 7

One gram of zinc oxide 3N5, 9 g of rutile powder, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (7). The average particle size of the powdered composition (7) was 15.1 μm.

The following method was carried out according to the method described in Preparation Example 1. By using 10.35 g of the above powder composition (7) instead of 2.45 g of the powder composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (7) of the present invention. The total amount of water used in the coating was 1.4 g.

Preparation example 8

One gram of zinc oxide 3N5, 9 g of Sun Zeolite MGF, 0.1 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (8). The average particle size of the powdered composition (8) was 131.1 μm.

The following method was carried out according to the method described in Preparation Example 1. By using 10.35 g of the above powder composition (8) instead of 2.45 g of the powder composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (8) of the present invention. The total amount of water used in the coating was 4.2 g.

Preparation Example 9

One gram of zinc oxide 3N5, 9 g of powdered DL clay, 0.1 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (9). The average particle size of the powdered composition (9) was 22.5 μm.

The following method was carried out according to the method described in Preparation Example 1. By using 10.35 g of the above powder composition (9) instead of 2.45 g of the powder composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (9) of the present invention. The total amount of water used in the coating was 2.4 g.

Preparation Example 10

One-tenth of a gram of zinc oxide second grade, 9.9 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (10). The average particle size of the powdered composition (10) was 44.5 μm, and its apparent relative density was 1.2 g/mL.

The following method was carried out according to the method described in Preparation Example 1. By using the above 10.35 g of the powdered composition (10) instead of 2.45 g of the powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (10) of the present invention. The total amount of water used in the coating was 2.3 g.

Preparation Example 11

Seventy point zero (70.0) parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: thiazol chlorpyramid) and 30.0 parts by weight of SHOKOZAN CLAY S were mixed and ground with a centrifugal mill to obtain powdery agrochemical A. The average particle size of the powdery agrochemical A determined by a wet measurement method using Mastersizer 2000 (manufactured by Malvern Instrument Co., Ltd.) was 13.0 μm. Five grams of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA and 0.086 g of powdery agrochemical A were mixed to obtain a powdery composition (11) .

The following method was carried out according to the method described in Preparation Example 1. By using the above 10.436 g of the powdered composition (11) instead of 2.45 g of the powdered composition (1), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (11) of the present invention. The total amount of water used in the coating was 3.9 g.

Preparation Example 12

Five grams of zinc oxide 3N5, 5 g of calcium carbonate G-100, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA and 0.01 g of SORPOL 5080 were mixed to obtain a powdery composition (12).

The following method was carried out according to the method described in Preparation Example 1. By using the above 10.36 g of the powdery composition (12) instead of 2.45 g of the powdery composition (1), the composition was added in four parts to form a coating layer and thereby obtain the coated rice seed of the present invention (12 ). The total amount of water used in the coating was 2.3 g.

Preparation Example 13

Five grams of rutile powder, 0.1 g of KURARAY POVAL PVA-224S, and 0.15 g of bentonite HOTAKA were mixed to obtain a powdery composition (13-1). Separately, 5 g of zinc oxide 3N5, 0.1 g of KURARAY POVALPVA-224S, and 0.15 g of bentonite HOTAKA were mixed to obtain a powdery composition (13-2).

The following method was carried out according to the method described in Preparation Example 1. Soak twenty grams of dry rice seeds, then add about a quarter (about 1.3 g) of 5.25 g of the powdered composition (13-1) to the rice seeds while spraying water with a sprayer to make the composition attached to rice seeds. When the powdery composition (13-1) is attached to the inner wall of the cup 2 made of polyethylene, a single addition of the powdery composition near the entire amount is made by scraping off the powdery composition (13-1) with a spatula. (13-1) Attachment to rice seeds. By repeating a similar process three times, 5.25 g of the powdery composition (13-1) was attached to rice seeds to form a first coating layer (hereinafter, referred to as "first layer") containing rutile powder. The total amount of water used in the coating was 1.3 g.

Then, under the condition of moving and rolling the rice seeds by keeping the simple seed coating machine working, about a quarter (about 1.3 g) Add to rice seeds to make the composition adhere to the outside of the first layer. When the powdery composition (13-2) is attached to the inner wall of the cup 2 made of polyethylene, a single addition of the powdery composition near the entire amount is made by scraping off the powdery composition (13-2) with a spatula. (13-2) Attachment to rice seeds. By repeating a similar process three times, 5.25 g of the powdery composition (13-2) was attached to the outside of the first layer to form a second coating layer (hereinafter, referred to as " Second floor"). The total amount of water used in the coating was 2.9 g.

Under the condition of moving and rolling the rice seeds by operating the simple seed coating machine, 0.1 g of SORPOL5080 was added to the rice seeds to adhere to the outside of the second layer. Rice seeds recovered from the simple seed coating machine were spread on stainless steel trays so as not to overlap, and dried overnight to obtain coated rice seeds (13) of the present invention.

Preparation Example 14

Five grams of zinc oxide 3N5, 5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (14). The average particle size of the powdered composition (14) was 11.6 μm.

To a cup having a capacity of 200 mL made of polyethylene, about 100 mL of water was poured, and 20 g of dried rice seeds were added thereto, followed by soaking for 10 minutes. The rice seeds were then recovered from the water, excess water adhering to the surface was removed, and the rice seeds were then loaded into a cup 2 made of polyethylene fixed to the created simple seed coater. The simple seed coating machine works in the range of 130 to 140 rpm in the mixer 3 to move and roll the rice seeds, then spray about a quarter of 10.35 g of the powdered composition (14) while spraying water with a sprayer One (approximately 2.6 g) was added to the rice seeds to attach the powdered composition (14) to the rice seeds. When the powdery composition (14) is attached to the inner wall of the cup 2 made of polyethylene, nearly the entire amount of the single-addition powdery composition (14) is attached by scraping off the powdery composition (14) with a spatula to rice seeds. By repeating the similar process three times, 10.35 g of the powdery composition (14) was attached to rice seeds to form a coating layer. The total amount of water used in the coating was 1.7 g. Then, 0.1 g of SORPOL 5080 was added to the rice seeds to adhere to the outside of the coating layer under the condition of moving and rolling the rice seeds by keeping the simple seed coating machine working. The coated rice seeds recovered from the simple seed coating machine were spread on stainless steel trays so as not to overlap, and dried overnight to obtain the coated rice seeds (14) of the present invention.

Preparation Example 15

Two grams of zinc oxide second grade, 18 g of iron oxide, 0.2 g of KURARAY POVAL PVA-220S and 0.5 g of bentonite HOTAKA were mixed to obtain a powdery composition (15). The average particle size of the powdered composition (15) was 8.1 μm, and its apparent relative density was 1.77 g/mL.

The following method was carried out according to the method described in Preparation Example 14. By using 20.7 g of the above powder composition (15) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.2 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (15) of the present invention. The total amount of water used in the coating was 3.5 g.

Preparation Example 16

One gram of zinc oxide second grade, 9 g of iron oxide, 0.2 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (16). The average particle size of the powdered composition (16) was 11.3 μm, and its apparent relative density was 1.77 g/mL.

The following method was carried out according to the method described in Preparation Example 14. By using 10.45 g of the above powder composition (16) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (16) of the present invention. The total amount of water used in the coating was 1.9 g.

Preparation Example 17

One gram of zinc oxide second grade, 9 g of iron oxide, 0.1 g of GOHSENOL GM-14S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (17). The average particle size of the powdered composition (17) was 8.5 μm.

The following method was carried out according to the method described in Preparation Example 14. By using 10.35 g of the above powder composition (17) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (17) of the present invention. The total amount of water used in the coating was 2.1 g.

Preparation Example 18

One gram of zinc oxide second grade, 9 g of iron oxide, 0.1 g of KURARAY POVAL PVA-224S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (18). The average particle size of the powdered composition (18) was 7.9 μm.

The following method was carried out according to the method described in Preparation Example 14. By using 10.35 g of the above powder composition (18) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (18) of the present invention. The total amount of water used in the coating was 2.0 g.

Preparation Example 19

Two grams of zinc oxide second grade, 0.2 g of iron oxide, 0.1 g of KURARAY POVAL PVA-205S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (19). The average particle size of the powdery composition (19) was 3.1 μm, and its apparent relative density was 0.61 g/mL.

The following method was carried out according to the method described in Preparation Example 14. By using 2.55 g of the above powder composition (19) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (19) of the present invention. The total amount of water used in the coating was 0.6 g.

Preparation Example 20

0.5 g of zinc oxide second grade, 9.5 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S and 0.25 g of bentonite HOTAKA were mixed to obtain a powdery composition (20). The average particle size of the powdered composition (20) was 20.2 μm, and its apparent relative density was 2.01 g/mL.

The following method was carried out according to the method described in Preparation Example 14. By using 10.35 g of the above powder composition (20) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (20) of the present invention. The total amount of water used in the coating was 1.7 g.

Preparation 21

Seventy point zero (70.0) parts by weight of (E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2-nitroguanidine (common name: thiazol chlorpyramid) and 30.0 parts by weight of SHOKOZAN CLAY S were mixed and ground with a centrifugal mill to obtain powdery agrochemical B. The average particle size of the powdery agrochemical B determined by a wet measurement method using Mastersizer 2000 (manufactured by Malvern Instrument Co., Ltd.) was 13.0 μm.

One gram of zinc oxide second grade, 9 g of iron oxide, 0.1 g of KURARAY POVAL PVA-220S, 0.25 g of bentonite HOTAKA, and 0.086 g of powdery agrochemical B were mixed to obtain a powdery composition (21). The average particle size of the powdered composition (21) was 9.6 μm.

The following method was carried out according to the method described in Preparation Example 14. By using 10.436 g of the above powder composition (21) instead of 10.35 g of the powder composition (14), the composition was added in four parts to form a coating layer, and then 0.1 g of SORPOL5080 was attached to the coating layer. outside to obtain the coated rice seeds (21) of the present invention. The total amount of water used in the coating was 1.9 g.

Preparation 22

Nine grams of iron oxide, 0.09 g of GOHSENOL GM-14S, and 0.225 g of bentonite HOTAKA were mixed to obtain a powdery composition (22-1).

Separately, 1 g of zinc oxide 3N5, 0.01 g of GOHSENOL GM-14S, and 0.025 g of bentonite HOTAKA were mixed to obtain a powdery composition (22-2).

The following method was carried out according to the method described in Preparation Example 14. Soak twenty grams of dry rice seeds, then use a simple seed coating machine to move and roll the rice seeds, then spray about a quarter ( about 2.3 g) to the rice seeds to attach the composition to the rice seeds. When the powdery composition (22-1) is attached to the inner wall of the cup 2 made of polyethylene, a single addition of the powdery composition near the entire amount is made by scraping off the powdery composition (22-1) with a spatula. (22-1) Attached to rice seeds. By repeating a similar process three times, 9.315 g of the powdery composition (22-1) was attached to rice seeds to form a first coating layer containing iron oxide (hereinafter, referred to as "first layer"). The total amount of water used in the coating was 0.6 g.

Then, under the condition of moving and rolling the rice seeds by keeping the simple seed coating machine working, about a quarter (about 0.26 g) Add to rice seeds to make the composition adhere to the outside of the first layer. When the powdery composition (22-2) is attached to the inner wall of the cup 2 made of polyethylene, a single addition of the powdery composition near the entire amount is made by scraping off the powdery composition (22-2) with a spatula. (22-2) Attached to rice seeds. By repeating a similar process three times, 1.035 g of the powdery composition (22-2) was attached to the outside of the first layer to form a second coating layer (hereinafter, referred to as "zinc oxide") containing zinc oxide on the outside of the first layer. Second floor"). The total amount of water used in the coating was 0.9 g.

Under the condition of moving and rolling the rice seeds by operating the simple seed coating machine, 0.1 g of SORPOL5080 was added to the rice seeds to adhere to the outside of the second layer. Rice seeds recovered from the simple seed coating machine were spread on stainless steel trays so as not to overlap, and dried overnight to obtain coated rice seeds (22) of the present invention.

Comparative Preparation Example 1

Ten grams of DAE1K and 1 g of KTS-1 were mixed to obtain 11 g of Iron Mixture A.

The following method was carried out according to the method described in Preparation Example 1. Twenty grams of dry rice seeds were soaked and about a quarter (about 2.8 g) of 11 g of Iron Mixture A was applied by operating the simple seed coater to move and roll the rice seeds and spray water with a dropper Added to rice seeds to attach Iron Mixture A to rice seeds. When the iron mixture A was attached to the inner wall of the cup 2 made of polyethylene, nearly the entire amount of the single-addition iron mixture A was attached to the rice seeds by scraping off the iron mixture A with a spatula. By repeating a similar process three times, 11 g of iron mixture A was attached to rice seeds to form a coating layer. The total amount of water used in the coating was 1.9 g. Then, 0.5 g of KTS-1 was added to the rice seeds to adhere to the outside of the coating layer under the condition of moving and rolling the rice seeds by keeping the simple seed coating machine working. The rice seeds recovered from the simple seed coating machine were spread on stainless steel trays so as not to overlap, and then water was sprayed to the rice seeds three times a day for two days to accelerate the oxidation of iron, and then the rice seeds were soaked overnight Dried to obtain coated rice seeds for comparison (I).

Next, test examples are shown.

Test example 1

A petri dish made of plastic was filled with about 30 g of soil and moistened with water, and then 50 coated rice seeds were sown on the soil surface. The petri dish was left to stand outdoors, then photographed with a time-lapse camera to observe its state and the number of coated rice seeds remaining one day after sowing was counted, and then the retention rate was calculated according to the following equation.

Retention rate (%)=number of coated rice seeds retained one day after sowing/50×100

The results are shown in Table 1. The rice seeds in Table 1 (as a control) represent uncoated rice seeds, and the retention rate of the seeds was 0% due to feeding damage by birds such as house sparrows.

[Table 1]

Retention(%) Coated Rice Seeds (1) 100 Coated Rice Seeds (2) 100 Coated Rice Seeds (3) 100 Coated Rice Seeds (4) 100 Coated Rice Seeds(5) 100 Coated Rice Seeds(6) 100 Coated Rice Seeds(7) 96 Coated Rice Seeds(8) 100 Coated Rice Seeds(9) 100 Coated Rice Seeds(12) 100 Coated Rice Seeds(13) 100 Rice seeds (as a control) 0

Test example 2

Wet gauze was placed on a petri dish made of plastic, and 20 coated rice seeds were sown on the surface. The petri dish was covered and then left to stand in a thermostat set at 17° C., and whether the seeds germinated was investigated after 10 days to calculate the germination rate according to the following equation.

Germination rate (%) = number of germinated seeds/50×100

The results are shown in Table 2.

[Table 2]

Test example 3

10 coated rice seeds were put into a petri dish containing 50 mL of water (water hardness: 3), and left to stand at room temperature (about 20° C.). After 30 minutes, the coating was investigated visually for flaking.

The results are shown in Table 3.

[table 3]

Whether there is peeling Coated Rice Seeds (1) does not exist Coated Rice Seeds (2) does not exist Coated Rice Seeds (3) does not exist Coated Rice Seeds (4) does not exist Coated Rice Seeds(5) does not exist Coated Rice Seeds(6) does not exist Coated Rice Seeds(7) does not exist Coated Rice Seeds(8) does not exist Coated Rice Seeds(9) does not exist Coated Rice Seeds(10) does not exist Coated Rice Seeds(11) does not exist Coated Rice Seeds(12) does not exist Coated Rice Seeds(13) does not exist

Test example 4

A petri dish made of plastic was filled with about 30 g of soil and moistened with water, and then 50 coated rice seeds were sown on the soil surface. The petri dish was left to stand outdoors, then photographed with a time-lapse camera to observe its state and the number of coated rice seeds remaining one day after sowing was counted, and then the retention rate was calculated according to the following equation.

Retention rate (%)=number of coated rice seeds retained one day after sowing/50×100

The results are shown in Table 4. The rice seeds in Table 4 (as a control) represent uncoated rice seeds, and the retention rate of the seeds was 0% due to feeding damage by birds such as house sparrows.

[Table 4]

Retention(%) Coated Rice Seeds(14) 96 Coated Rice Seeds(15) 94 Coated Rice Seeds(16) 98 Coated Rice Seeds(17) 98 Coated Rice Seeds(18) 100 Coated Rice Seeds(19) 100 Coated Rice Seeds(22) 94 Rice seeds (as a control) 0

Test example 5

Wet gauze was placed on a petri dish made of plastic, and 20 coated rice seeds were sown on the surface. The petri dish was covered and then left to stand in a thermostat set at 17° C., and whether the seeds germinated was investigated after 10 days to calculate the germination rate according to the following equation.

Germination rate (%) = number of germinated seeds/50×100

The results are shown in Table 5.

[table 5]

Germination rate(%) Coated Rice Seeds(15) 100 Coated Rice Seeds(16) 100 Coated Rice Seeds(17) 95 Coated Rice Seeds(18) 90 Coated Rice Seeds(19) 100 Coated Rice Seeds(21) 100 Coated Rice Seeds (I) 28

Test example 6

Ten coated rice seeds were put into a petri dish containing 50 mL of water (water hardness: 3), and left to stand at room temperature (about 20° C.). After 30 minutes, visual inspection was used to investigate the presence or absence of flaking of the coating.

The results are shown in Table 6.

[Table 6]

Whether there is peeling Coated Rice Seeds(14) does not exist Coated Rice Seeds(15) does not exist Coated Rice Seeds(16) does not exist Coated Rice Seeds(17) does not exist Coated Rice Seeds(18) does not exist Coated Rice Seeds(19) does not exist Coated Rice Seeds (20) does not exist Coated Rice Seeds(21) does not exist Coated Rice Seeds(22) does not exist

Explanation of reference signs

1 axis

2 cups made of polyethylene

3 stirrers

4 brackets

Claims (22)

1. A coated rice seed with a coating layer, wherein the coating layer comprises polyvinyl alcohol, zinc oxide, bentonite having a degree of polymerization of more than 500 and a degree of saponification in the range of 71.0 mol% to 97.5 mol%. and surfactants. 2. A coated rice seed having a coating layer, wherein the coating layer comprises polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification ranging from 71.0 mol% to 97.5 mol%, zinc oxide and bentonite , and at least a surfactant is maintained on the surface of the coated rice seeds. 3. The coated rice seed according to claim 1 or 2, wherein the coating layer comprises at least one selected from the group (A) below; (A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate. 4. The coated rice seed according to claim 3, wherein the coating layer has a first layer comprising at least one selected from the group (A) and a layer coated on the outside of the first layer. Contains a second layer of zinc oxide. 5. The coated rice seed according to any one of claims 1 to 3, wherein the coating layer further comprises iron oxide. 6. The coated rice seed according to claim 5, wherein the coating layer has a first layer comprising iron oxide and a second layer comprising zinc oxide coated on the outside of the first layer. 7. A powdery composition comprising polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification ranging from 71.0 mol% to 97.5 mol%, zinc oxide, and bentonite. 8. The powdery composition according to claim 7, comprising at least one selected from the group (A) below; (A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate. 9. A powdered composition according to claim 7 or 8, wherein the average particle size is in the range of 0.01 to 150 μm. 10. A powdered composition according to any one of claims 7 to 9, wherein the apparent relative density is in the range of 0.30 to 2.50 g/mL. 11. The powdered composition according to any one of claims 7 to 9, wherein the apparent relative density is in the range of 0.30 to 2.0 g/mL. 12. A powdered composition according to any one of claims 7 to 11, further comprising iron oxide. 13. A powdered composition according to any one of claims 7 to 12, wherein the zinc oxide has an average particle size in the range of 0.01 to 100 μm. 14. A kit for preparing coated rice seeds, said kit having at least polyvinyl alcohol, zinc oxide, bentonite and Surfactant. 15. The kit of claim 14 further comprising iron oxide. 16. The kit according to claim 14 or 15, which has at least one selected from the group (A) below; (A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate. 17. A method for preparing coated rice seeds, said method comprising the steps of: (1) While moving and rolling the rice seeds, polyvinyl alcohol, zinc oxide, bentonite, selected from the group (A) at least one and water to form a coating layer comprising said polyvinyl alcohol, zinc oxide, bentonite and at least one selected from the group (A) below, (2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and (3) a step of drying the seeds obtained in step (2); (A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate. 18. A method for preparing coated rice seeds, said method comprising the steps of: (1) (I) While moving and rolling the rice seeds, polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, bentonite, a compound selected from the group (A) below is added at least one and water to form a coating layer comprising said polyvinyl alcohol, bentonite and at least one selected from the following (A) group, and (II) moving and rolling the obtained in step (I) a step of simultaneously adding the polyvinyl alcohol, zinc oxide, bentonite and water to the seed to form a coating layer comprising the polyvinyl alcohol, zinc oxide and bentonite on the outside of the layer formed by step (I), (2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and (3) a step of drying the seeds obtained in step (2); (A) group: a group consisting of titanium oxide, clay, zeolite and calcium carbonate. 19. A coated rice seed prepared by the method according to claim 17 or 18. 20. A method for preparing coated rice seeds, said method comprising the steps of: (1) Add polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, while moving and rolling rice seeds, zinc oxide, iron oxide, bentonite, and water to form a Describe the step of the coating layer of polyvinyl alcohol, zinc oxide, iron oxide and bentonite, (2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and (3) A step of drying the seeds obtained in the step (2). 21. A method for preparing coated rice seeds, said method comprising the steps of: (1) (i) Add polyvinyl alcohol having a degree of polymerization of 500 or more and a degree of saponification in the range of 71.0 mol% to 97.5 mol%, while moving and rolling rice seeds, iron oxide, bentonite, and water to form a the steps of the coating layer of polyvinyl alcohol, iron oxide and bentonite, and (ii) adding said polyvinyl alcohol, zinc oxide, bentonite and water while moving and rolling the seeds obtained in step (i) to a step of forming a coating layer comprising said polyvinyl alcohol, zinc oxide and bentonite on the outside of the layer formed in step (i), (2) a step of adding a surfactant to keep the surfactant outside the layer formed by the step (1) while moving and rolling the seeds obtained in the step (1), and (3) A step of drying the seeds obtained in the step (2). 22. A coated rice seed prepared by the method according to claim 20 or 21.