JPH07206565A - Coated granular fertilizer containing minor element - Google Patents

Abstract

PURPOSE:To obtain a coated granular fertilizer improved in elution of a minor element just after applying by coating fertilizer grains with a coating material composed of the powdery minor element and a highly water vapor permeable binder. CONSTITUTION:This coated granular fertilizer containing a minor element is obtained by coating grains of a slow-release fertilizer or a coated granular fertilizer with a coating material prepared by blending a powdery minor element having 1-250mum grain diameter with a highly water vapor permeable binder at (99.9:1) to (10:90) weight ratio using a jet type coater, etc. The binder is composed of a coating material (A) and/or a coating material (B). The coating material (A) is one or two or more materials selected from an olefin polymer, a copolymer containing the olefin, a copolymer containing vinylidene chloride, a diene-based polymer, waxes, petroleum resins, natural resins, oils and fats and modified materials thereof. The coating material (B) is a polyester derived from a monomer selected from epsilon-caprolactone, lactic acid and 3-hydroxybutyrate. The minor element is contained in an amount of about 0.01-30wt.% based on the whole fertilizer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coated granular fertilizer containing trace elements. More specifically, by forming a film of powdered trace elements and a binder on the surface layer of granular fertilizer, the release control and absorption utilization rate of essential plant elements, especially trace elements, is increased to the same level or higher than that of coated granular fertilizer, and especially the elution immediately after application. Relates to a coated granular fertilizer containing trace elements.

[0002]

2. Description of the Related Art Up to now, various kinds of slow-release fertilizers have been studied which can supply nutrients according to the nutrient requirements of plants by freely controlling the release of fertilizer components. Since the slow-release fertilizer is affected by soil moisture, pH, microbial action, etc., the fertilizer components were not stably supplied, and the supply rate was insufficiently adjusted. On the other hand, coated granular fertilizers that can control the elution of fertilizer components without being much influenced by the soil environment have been developed and gradually put into practical use. In recent years, control of period, pattern, timed elution, etc. has been put into practical use. By cultivating the whole amount of basic fertilizer, the fertilizer application amount of 2-3 crops can be satisfied with one fertilization, and labor saving of agricultural work can be achieved. Particularly in mulch cultivation, top dressing is performed by removing the mulch film, and it can be said that the effectiveness is high because the series of top dressing operations is eliminated. Furthermore, the improvement of the nutrient absorption and utilization rate of the plant was brought about by reducing the loss of fertilizer due to runaway without being absorbed by controlling so that the amount required for absorption and utilization is eluted. This makes it possible to neglect the impact of fertilizer on the environment.

However, the control of essential elements, especially the three essential elements such as nitrogen, phosphoric acid and potassium can be solved by coating and blending compound fertilizers and simple fertilizers, but other agricultural materials such as pesticides and trace amounts Precise release control technology has not been completed in the element field, which is an obstacle to the construction of an ideal labor-saving cultivation system as a whole. Among these problems, the present invention effectively complements the above system by improving the release control and absorption utilization rate of trace elements, and avoiding the trace element deficiency immediately after transplantation of plants. Essential plant elements include three essential elements such as nitrogen, phosphoric acid and potassium, as well as calcium, magnesium and sulfur, and as trace elements iron, manganese, boron, zinc, copper, molybdenum, chlorine and other nutrients such as silicon, sodium, There are iodine, cobalt, vanadium, etc. In recent years, the yield of crops for a fixed acreage has risen, and even if trace elements such as trace elements that originally need only a small amount are continuously absorbed every year, the amount in the soil will be insufficient, and it is necessary to constantly supplement the trace elements. , Such soils are becoming very much. However, since these trace elements are always necessary, and when they are excessive, they have a harmful effect, so that it is necessary to pay sufficient attention to the properties, amount and method of use of each fertilizer.

[0004] For the technology of controlling the release of trace elements, water-soluble trace elements are coated with a single component or two or more components of granular fertilizer. The water-soluble trace elements are mixed with the fertilizer, and then the trace elements are melted into the coated glass. It is conceivable to apply the chemical compound to coated granular fertilizer. In terms of release control, it is desirable to coat each component individually, but it is complicated, and when these are mixed with other fertilizers such as in a grain mixture, the amount is small and a uniform fertilizing effect is obtained. I can't get it. Further, in the case of coating mixed particles of two or more components, the respective elution rates differ depending on the type and proportion of the trace elements, and desired release control is virtually impossible. Furthermore, since it exists separately from the large amount of elemental fertilizer, there is a basic drawback that the probability of contact with the root is low and the utilization rate does not increase. In, the balanced release control of fertilizer component and trace element component of nuclear particles is not possible. In (2), it is slow-released because it is soluble in water, and it is possible to control the slow-release, but not the release, depending on the pulverized particle size and glassy conditions. In this method, the utilization rate is up to about 30-40%. In, there is an advantage of coexisting with the coated granular fertilizer, but the effect is almost the same as the above case. Furthermore, the trace element layer adhering to the surface often influences the setting of the elution rate of the coated granular fertilizer component inside, and there is a drawback that it cannot be effectively utilized.

Various attempts have been made to solve such problems. For example, Japanese Patent Application Laid-Open No. 2-196079 teaches an agricultural material multiple coated fertilizer comprising a method of coating a coated granular fertilizer with a film-forming material and a mixture of magnesia and trace element salts. When the film-forming material is a resin having low moisture permeability such as polyolefin, it is not preferable because it affects the precise elution control of the nuclear fertilizer. Since the trace elements are only water-soluble substances, balanced release control is practically difficult, and there is a problem that it is unavoidable that elution may be rapid. The present inventor has proposed in Japanese Patent Application No. 5-223840 a coated granular fertilizer containing a binder and a Cu-soluble trace element in the coated granular fertilizer, but when applied to volcanic ash soil, for example, trace element elution It is mildly effective to some extent, but its initial dissolution tends to be delayed. In addition, it is easy to add a large amount of manganese, boron, etc. in the Cu-soluble trace element, but it is difficult to increase the iron content, so the usage is limited. The use of slow-release fertilizers such as coated granular fertilizers is effective in regenerating volcanic ash soil into agricultural land, but with regard to trace elements, especially Fe, Fe is hardly soluble under field conditions.
It precipitates as a valent iron salt, most of which is extremely insoluble in water. Especially when the pH is high, Fe deficiency is likely to occur. In the case of rice, iron is sufficiently supplied from the soil under the flooded condition because the trivalent iron ions in the soil are reduced to divalent, but Fe deficiency occurs immediately after transplanting in the upland rice under field conditions. In order to do so, it must be constantly replenished.

[0006]

DISCLOSURE OF THE INVENTION In view of the above-mentioned problems of the prior art relating to the technology for controlling the release of trace elements, the present inventors have focused on the following points regarding the control of release of trace elements.
In other words, by coexisting trace elements with granular fertilizer to increase root density in the surrounding area and increasing absorption utilization rate. By adhering trace elements to the surface of granular fertilizer, the uniformity of application is enhanced and even if it is attached to the surface of coated fertilizer, nuclear coated granular fertilizer is used. Fertilizers that meet the conditions of preventing trace element deficiency immediately after transplantation that can control release of trace elements themselves so that they do not affect the dissolution rate (prevent precision control from being impaired) Is to get. For more details,
In order to prevent the elution of the granular fertilizer from being affected by the formation of a film on the surface of the granular fertilizer, the binder used for the surface adhesion layer is made of a material with high moisture permeability, but this does not impair the elution characteristics of the granular fertilizer, In particular, it removes the adverse effect on the dissolution simulation in the case of coated granular fertilizer.
As a result of extensive studies on a controlled release technique that does not cause deficiency to satisfy these aims, the present invention has been completed by coating the surface of a granular fertilizer coated with a trace element with a material having high moisture permeability. As is apparent from the above description, an object of the present invention is to provide a trace element-containing coated granular fertilizer which has a small influence on the elution characteristics of the coated granular fertilizer, enhances the absorption utilization rate of the trace elements, and avoids deficiency in the initial stage of application. That is.

[0007]

Means for Solving the Problems The present invention includes the following (1) to
It has the configuration of (5). (1) A trace element-containing coated granular fertilizer obtained by coating fertilizer particles with a coating material composed of a powdery trace element and a highly moisture-permeable binder. (2) The binder comprises the coating material A and / or the coating material B, and the coating material A is an olefin polymer, a copolymer containing olefin, a copolymer containing vinylidene chloride, a diene polymer, waxes, petroleum, etc. Resin, natural resin, fats and oils and modified products thereof, and the coating material B is ε-caprolactone, lactic acid, and 3-
The trace element-containing coated granular fertilizer according to (1) above, which is a polyester derived from a monomer selected from the group consisting of hydroxybutyrate. (3) The trace element-containing coated granular fertilizer according to (1), wherein the fertilizer particles are a slow-release fertilizer or a coated granular fertilizer. (4) The microparticulate-containing coated granular fertilizer according to (1), wherein the particle size of the powdery microelement is 1 to 250 μm. (5) The trace element-containing coated powdered fertilizer according to (1) above, wherein the powdery trace element has a chelate metal salt powder and / or a soluble metal powder as an active ingredient.

The structure and effect of the present invention will be described in detail below. The microelement-containing coated granular fertilizer of the present invention is obtained by coating the granular fertilizer with microelement powder, and the microelement granules are preferably in the form of fine powder. In the case of fine powder, there is a concern that trace elements will not be eluted by being taken into the binder,
Avoided by using highly permeable materials. Furthermore, by using degradable polyester, the trace elements are completely eluted. As for the form of the trace elements, the fusible powder is an excellent and preferable form because the elution can be controlled to some extent by the particle size, the vitreous composition and the like.
However, for example, in the case of a molten trace element compound fertilizer, it is possible to contain 20 wt% or more of manganese and boron, but iron, zinc, copper, etc. tend to soften the powder as the content increases. There is a risk of impairing the slow release effect of fertilizer, which is a characteristic of soluble powders. Further, in the trace element-deficient soil, the solubilization of the Cu-soluble powder may cause deficiency because the initial elution is delayed, which is not universal but has the advantage of slowing effect. Under field conditions, iron becomes trivalent, but it is generally prone to iron deficiency depending on the plant. Tomatoes have the ability to reduce ferric iron to ferric iron, and gramineous plants secrete mugineic acid, which dissolves ferric iron, but is not rooted like at the time of transplantation. Then, the reducing ability cannot be exerted.

The present inventors have completed the present invention as a result of repeated search studies to solve the above problems.
It is achieved by using a trace element powder and a decomposable polyester composition having high moisture permeability as a binder, and the trace element is 30 to 0.01% by weight, preferably 15 to 0.5% by weight of the whole fertilizer of the present invention. It is good that it contains some degree. The binder used for coating the trace elements is not preferable because the adhesiveness of the trace elements increases as the proportion of the binder of the fertilizer of the present invention increases, but the amount of components in the granular fertilizer inside is relatively reduced, and the fertilizer of the present invention is preferable. Trace elements: binder = 99.9: 0.1 to 10:90 by weight, more preferably 95: 5 to 50:50, mixed and stirred, and carefully coated over a period of time. It is possible to obtain a good trace element-containing coated granular fertilizer. If the particles are in the form of fine powder, they are taken into the film, but since the film is decomposed and the particles appear, it can be said that there are few problems.
If the particle size of the powder is about 20 μm, a stable film structure will be obtained, but the elution tends to be rather fast, and the trace elements are 150 μm.
When the particle size is relatively coarse, such as m or more, the film is slightly thickened because the binder is increased to cover it, but if the particle is coarse, the elution rate is delayed by that amount, which is a preferable result in crop cultivation. By repeating these trial and errors, it was found that the elution rate can be adjusted by changing the particle size range of the powder within the range of 250 μm to 1 μm.

The trace elements are not particularly limited, but are water-soluble such as iron sulfate, iron chloride, boric acid, borax, manganese sulfate, manganese chloride, zinc sulfate, copper sulfate, ammonium molybdate, sodium molybdate, etc. Trace elements, chelating metal salts and water-insoluble Cu-soluble trace elements,
Examples thereof include those containing iron, manganese, boron, zinc, copper, molybdenum, etc., and one or more elements selected from them, which contain trace elements, for example, chelated iron, chelated copper, chelated zinc, etc. In addition to chelating metal salts of, fertilizer, humic acid phosphate fertilizer, processed phosphate fertilizer, silicic acid potassium fertilizer, manganese carbonate fertilizer, slag manganese fertilizer,
Examples include borate fertilizers, fused boron fertilizers, fused trace element compound fertilizers. Among these, chelate metal salts and ku-soluble trace elements are preferable, and ku-soluble trace elements obtained by melting the trace elements in glass are more preferable. In particular, a compound in which a chelating metal salt is mixed with a soluble copper trace element is preferable because the initial trace element elution can be obtained. The particle size of the trace element granules is about 250 μm and almost all through 150 μm.
Although it passes 0% or more, it is preferable that the particles having a uniform particle size have a release controllability of 105 to 75 μm.

The binder is one selected from olefin polymers, olefin-containing copolymers, vinylidene chloride-containing copolymers, diene-based polymers, waxes, petroleum resins, natural resins, fats and oils and modified products thereof. Alternatively, two or more substances and / or polyesters are used. The olefin polymer is polyethylene, polypropylene, ethylene / propylene copolymer, polybutene, butene / ethylene copolymer, butene / propylene copolymer, polystyrene, etc., and the olefin-containing copolymer is ethylene / acetic acid. Vinyl copolymers, ethylene / acrylic acid copolymers, ethylene / methacrylic acid ester copolymers, ethylene / carbon monoxide copolymers, ethylene / vinyl acetate / carbon monoxide copolymers, etc. The copolymer containing is a vinylidene chloride / vinyl chloride copolymer, and the diene polymer is a butadiene polymer, an isoprene polymer, a chloroprene polymer, a butadiene / styrene copolymer, an EPDM polymer, a styrene polymer. Waxes such as isoprene copolymers are beeswax,
Wood wax, paraffin, etc., natural resins are natural rubber, rosin, etc., and fats and oils and their modified products are hardened products, solid fatty acids, metal salts, etc.

Examples of the polyester according to the present invention include poly-ε-caprolactone, poly-δ-valerolactone, poly-β-propiolactone, poly-γ-butyrolactone, polylactic acids such as polylactic acid and polyglycolic acid, and poly- Polyhydroxyalkanoates such as 3-hydroxybutyrate and poly-3-hydroxyvalerate, chitin, chitosan, poly-p-dioxanone, trimethylene carbonate polymer, polymalic acid, acid anhydride polymer, polyvinyl alcohol, poly Examples thereof include polysaccharides such as alkyl cyanoacrylate, amylose, starch and dextran, and copolymers thereof.

Among these polyesters, poly-ε-caprolactone, poly-δ-valerolactone, poly-β-propiolactone, poly-γ-butyrolactone, polylactic acid, polyglycolic acid are preferably used in the present invention. And polyesters represented by polyhydroxyalkanoates such as poly-3-hydroxybutyrate, poly-3-hydroxybutyrate, and the like. More specifically, it is easily decomposed when applied to soil or water. A polyester having at least ε-caprolactone units and / or lactic acid units and / or 3-hydroxybutyrate units in its molecular structure.

The polylactic acid monomer, which is the polyester used in the present invention, has three types of optical isomers, L-form, D-form, D, and L-form, and any of these can be used. The objects of the present invention can be achieved. These polyesters used in the present invention have a very good film in terms of disintegration in soil, and although there are differences in the decomposition rate depending on the type,
Even an arbitrary composition comprising these can be used for the purpose of improving the physical properties of the coating film, the filler, etc. without impairing the effects of the present invention. When these resins are mixed, the type and proportion of the coating material are determined from the viewpoints of film physical properties such as degradability in soil, adhesion of trace elements, and moisture permeability.

The molecular weight of polylactic acid is preferably 10,000 or more from the viewpoint of coating strength, and the upper limit is preferably 500,000 or less from the operability of the coating process, but a particularly preferable range is 50,000 to 300,000. Thus, for example, by arbitrarily mixing polylactic acids having different molecular weights, it is possible to control the decomposition rate of the coating film, and the poly-ε-caprolactone, poly-3-hydroxybutyrate and their copolymers can be adjusted. The same applies to a composition obtained by mixing the above or a mixture with a resin having different degradability.

When a water-soluble trace element such as manganese sulfate or boric acid was applied in the field to prevent deficiency of the trace element, the amount that effectively acted on the applied amount due to runoff or insolubilization was not large. Therefore, for example, by using the molten trace element fertilizer, the equivalent effect was obtained with about 40% of the water-soluble fertilizer, and the effective amount increased. Fused microelement fertilizers are water-insoluble and elute the more acidic they are, and since they are similar to natural supply from soil, it is preferable to supplement trace elements to soil compared to water-soluble ones. In the case of volcanic ash soil, trace element deficiency is observed in rice immediately after planting, so there is a case where a fast-acting trace element is necessary.Preferably, a chelate metal salt is added, but it is advantageous in terms of cost. Trace elements can also be added.

The present invention is applicable to granules containing any fertilizer component. For example, ammonium sulfate, ammonium salt, ammonium chloride, urea, potassium chloride, nitrate nitrate, sodium nitrate, ammonium phosphate, potassium phosphate, calcium phosphate chemical conversion fertilizer, slow-release fertilizer,
Chemically synthetic slow-release fertilizer isobutyraldehyde condensed urea,
Examples include fertilizers containing acetaldehyde-condensed urea, formaldehyde-processed urea fertilizer, guanylurea sulfate, oxamide, coated nitrogen fertilizers of coated fertilizers, coated potassium fertilizers, and coated compound fertilizers. Further, these also include compound fertilizers mixed with a nitrification inhibitor such as dicyandiamide. Of these, slow-release fertilizers and coated fertilizers are preferably used, and coated fertilizers are more preferably used, which are effective in improving the absorption utilization rate of trace elements.

In general, plant roots absorb nutrients from the medium soil and at the same time secrete various substances into the soil environment. Therefore, the soil near the root shows different properties from the distant soil that is not affected by this, and this area is called rhizosphere, but as the root system develops, the soil areas where plants go around are one after another. Will be converted to. In the new rhizosphere soil, various substance changes occur due to the actions of the root itself and rhizosphere microorganisms, and active nutrient absorption starts. The direct source of nutrient water for plants is thought to be the soil solution in the rhizosphere. Generally, when the nutrient concentration of the rhizosphere soil solution decreases, the nutrient adsorbed on the solid phase is released, and the higher the nutrient concentration, the more the nutrient absorption amount of the plant increases. However, nutrients in the rhizosphere alone cannot guarantee the required amount of plants. In order to maintain nutrient absorption in the rhizosphere, it is necessary to transfer nutrients from the adjacent non-rhizosphere to the rhizosphere. Diffusion may be considered for the transfer of nutrients to the rhizosphere, but the extension of the rooting that the roots of the plant itself expand and spread to new soil to acquire nutrients, that is, the increase in the rhizosphere soil amount is the mobility in the soil solution It is extremely important for the absorption of low nutrients.

When the molten trace element fertilizer, the slow-release fertilizer, and the coated granular fertilizer are applied to the soil at the same time, if the molten trace element fertilizer is not in a powder form, the components will be non-uniform and the concentration will be partly high and Influence. If it is in powder form, it is difficult to apply it together with granular fertilizer, and the work becomes complicated. When applied uniformly, it will run away or become insoluble after elution without being used where roots do not grow. In addition, there are 3
There are many cases where it does not work effectively, such as a relatively low absorption utilization rate, and it cannot be overlooked in terms of environmental problems such as groundwater pollution by nitrate nitrogen in recent years.

After application of the coated granular fertilizer containing trace elements of the present invention, by controlling the release of essential high-volume elements such as Chisso which elutes from the nuclear fertilizer into the soil solution, the elution induces roots and the rhizosphere around the fertilizer. A fertilizer that forms and slowly dissolves nutrients with low mobility in the rhizosphere soil solution into the soil solution of the rhizosphere gradually by a secretory action etc. However, since the nutrients are dissolved in the soil solution in the rhizosphere, it acts effectively, and a small amount of application produces the same effect. In addition, the improvement of absorption utilization rate will prevent groundwater pollution due to unused fertilizer components.

The method for producing the coated fertilizer containing trace elements of the present invention is not particularly limited, but can be carried out in the same manner as, for example, a known method (Japanese Patent Publications Nos. 50-99858 and 60-37074). The method comprises spraying an organic solvent solution of the above coating composition onto a granular fertilizer in a rolling or fluid state by means such as spraying to form a trace element film on the surface of the fertilizer, while simultaneously coating the coating composition in parallel. In this method, the organic solvent on the surface of the granular fertilizer is instantaneously evaporated and dried by treating with a high-speed hot air stream. The fluidization of the granular fertilizer in this case is most preferably performed using a spouted bed. In the production method, in order to uniformly disperse the trace element granules according to the present invention, it is necessary to strongly agitate the mixed liquid tank of the binder and the trace element granules to prevent aggregation and sedimentation. Also,
The temperature of the high-speed hot air flow needs to be maintained at a temperature (for example, 50 to 100 ° C.) that does not damage the coating of the coated granular fertilizer.

The present invention will be described below with reference to examples. Example 1. Example of production of fertilizer of the present invention Particle size of composition of film is ethylene / carbon monoxide copolymer, ethylene / vinyl acetate copolymer, talc, surfactant
Tyler 6-8 mesh pass granular coated urea (adjusted to elute 80% of nitrogen component in water at 25 ° C for 100 days) was used as a test coated granular fertilizer. Fused as a trace element on the surface of coated granular fertilizer
E1 No., Nippon Fellow Co., Ltd.) is used as the coated granular fertilizer 300
Perchlor ethylene containing 9 kg per kg and 1 kg of poly-ε-caprolactone as a binder was prepared.
The trace elements and binder are 80:20 by weight. The surface of the core-coated granular fertilizer was coated with this using a jet-type coating device at a temperature of 65 ° C. As a result of examining the elution of the components of the product and the coated granular fertilizer used as the core, the same tendency of elution was found for the nitrogen component. Regarding the trace elements, the initial elution tended to be fast, which was a favorable result for the cultivation of upland rice. 2. Coating treatment 1. Using the same jet type coating apparatus as described above, CDU nitrogen (Tyler 8-16 mesh pass product of Chisso Corporation) was coated with the composition shown in Table 1.

3. Soil Decomposition Test of Coatings A soil decomposition test of coatings was carried out for Examples and Comparative Examples. Put 10g of sample in polypropylene non-woven fabric of 10cm x 10cm, and put 20 in paddy field in Mizoi, Kitsuki city, Oita prefecture.
It was buried under a cm, taken out after a predetermined period, washed with water, and the state of the capsule was observed. One year later, we observed No. 1
In the test section of the example shown in FIG. 11, slight traces were observed, and in the test sections shown in Comparative Examples 1 and 2, the original shape was observed. In the product of the present invention, the film of the trace element was subjected to the decomposition action, and it was found that a finely powdered Cu-soluble trace element can be used.

4. Dissolution test With the composition shown in Table 1, 1. The coated urea was subjected to coating treatment, and the effect on the elution of the coated urea was investigated. The test method is as follows: 10 g of the fertilizer of the present invention is immersed in 200 ml of water for 25
Let stand at ℃. After a predetermined period, it is divided into fertilizer and water, and the amount of urea eluted in water is determined by quantitative analysis. 20 pure water for fertilizer
0 ml is added and the mixture is allowed to stand at 25 ° C. again, and the same analysis is performed after a predetermined period. Table 2 shows the results of the relationship between the cumulative amount of urea eluted in water and the number of days after repeating such operations. Since the product of the present invention has almost no effect on the dissolution characteristics of the test-coated urea, it was found that the precise dissolution control was not impaired.

[0025]

[Table 1] * 1 Low density polyethylene MI = 20 d = 0.9
22 * 2 Ethylene / carbon monoxide copolymer MI = 20
CO = 0.95% by weight * 3 Polyvinylidene chloride copolymer (using Saran wrap) * 4 Copolymer-type atactic polypropylene containing 3% of ethylene Mw = 60,000 * 5 Poly-ε-caprolactone Mw = 10,000
0 * 6 poly-ε-caprolactone Mw = 30000
0 * 7 poly-ε-caprolactone Mw = 50000
0 * 8 poly-ε-caprolactone Mw = 80,00
0 * 9 3-hydroxybutyrate / 3-hydroxyvalerate copolymer Mw = 150,000 3-hydroxyvalerate fraction 20 mol% * 10 Poly-L-lactic acid Mw = 60,000 * 11 Poly-L-lactic acid Mw = 150,000 * 12 Chillest Fe (Chillest Co., Ltd.), EDTA
Fe / Na / 3H ₂ O metal content 13% or more * 13 Chillest Zn (Chillest Co., Ltd.), EDTA
Zn ・ 2Na ・ 3H ₂ O Metal content: 13.7% or more * 14 CHIREST Cu (CHIREST Co., Ltd.), EDTA ・
Cu ・ 4Na ・ 3H ₂ O Metal content of 12.8% or more * 15 FeSO ₄ · 7H ₂ O * 16 Kumiai FTE No. 1 (Nippon Fellow Co., Ltd.) * 17 Kumiai Soluble Total Trace Element Fertilizer Agriace K
-20 (Nippon Fellow Co., Ltd.) * 18 Kumiai Fused Fertilizer B-24 Hiboron (Nippon Fellow Co., Ltd.) * 19 Kumiai FTE Mineras for Paddy Rice (Nippon Fellow Co., Ltd.)

[0026]

[Table 2]

Claims (5)

[Claims] 1. A coated fertilizer containing trace elements, which is obtained by coating fertilizer particles with a coating material comprising a powdered trace element and a highly moisture-permeable binder. 2. The binder comprises a coating material A and / or a coating material B, wherein the coating material A is an olefin polymer, an olefin-containing copolymer, or a vinylidene chloride-containing copolymer.
One or more substances selected from diene polymers, waxes, petroleum resins, natural resins, fats and oils and modified products thereof, wherein the coating material B is ε-caprolactone, lactic acid,
The trace element-containing coated granular fertilizer according to claim 1, which is a polyester derived from a monomer selected from the group consisting of and 3-hydroxybutyrate. 3. The trace element-containing coated granular fertilizer according to claim 1, wherein the fertilizer particles are slow-release fertilizer and coated granular fertilizer. 4. The trace element-containing coated granular fertilizer according to claim 1, wherein the particle size of the powdery trace element is 1 to 250 μm. 5. The trace element-containing coated powdery fertilizer according to claim 1, wherein the powdery trace element has a chelate metal salt powder and / or a soluble metal powder as an active ingredient.