JP2004290033A - Method for raising seedling of plant and raising seedling medium for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for raising seedlings of plants by which cover soil can be produced in a relatively small number of operation man-hour, sound seedling roots of the plants sufficiently grow and stalks of the plants grow firmly, and sound seedlings from ordinary rice seeds can be raised as well as those from artificially coated brown rice seeds. <P>SOLUTION: The method for raising seedlings of plants comprises the following process: spreading bed soil 11a in a raising seedling box 10; sowing plant seeds 12 on the bed soil 11a; and covering the bed soil 11a and seeds 12 with cover soil 11b. Only the cover soil 11b, or both of the bed soil 11a and the cover soil 11b comprise(s) chips or chip dusts each having an average granular diameter of 0.1-10 mm and made of sap wood of coniferous trees or a mixture comprising coniferous tree sap wood and heartwood. The coniferous trees comprise at least one kind selected from the group consisting of pine tree and Japanese cypress tree, and the mixture ratio of the sap wood and core wood is (60-100) : (40-0). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for growing seedlings of plants such as rice, and a medium for growing the seedlings.
[0002]
[Prior art]
In recent years, from the viewpoints of environmental pollution and safety, attention has been paid to the problem of crop contamination and environmental pollution caused by pesticides, and the tendency to use pesticides as little as possible on the agricultural side has become common. For this reason, the amount of pesticides used has been greatly reduced compared to a certain period of time, and more and more farmers are conducting pesticide-free cultivation without pesticides or completely organic cultivation without pesticides and chemical fertilizers. However, many of these pesticide-free and completely organic cultivations are carried out on farmland under favorable environmental conditions with few pests, and most other farmland will be damaged by pests unless measures are taken against them. As a result, it is necessary to use a minimum amount of pesticides.
[0003]
For this reason, mountain soil containing almost no soil-borne pathogens that kill rice is generally used for raising rice. However, in recent years, mountain soil collection is extremely difficult, and mountain soil collection may lead to environmental destruction. In recent years, since rice agriculture is performed by weak elderly people and women, transporting nursery boxes using heavy soil as a seedling culture medium has become a heavy labor. In recent years, cedar has not been used much, so pruning and thinning of cedar have not been carried out, and the mountains where cedar has been planted have become unlimited.
[0004]
In order to solve these problems, there is known a medium for raising rice seedlings in which bark crushed into appropriate chips is used as a base material and a predetermined nutrient is added to adjust the pH to 4.5 to 5 (for example, Patent Document 1).
In the thus constructed medium for raising rice seedlings, light bark is used as a base material, so that the medium can be easily introduced into the seeding machine and the seedling box can be transported, and the air permeability and water retention of the medium can be easily achieved. The property can be kept good.
[0005]
Further, a soil modifying material obtained by carbonizing bark of cedar or cypress in an anaerobic state or a low oxygen state is known (for example, see Patent Document 2).
In the soil modifying material configured as described above, there is no generation of carbon dioxide due to the generation of the soil modifying material, and the indestructibility of the soil modifying material can be improved. In addition, since bark of cedar and cypress containing a small amount of protein components is used, it is possible to prevent generation of harmful gases such as hydrogen sulfide and offensive odor when producing a soil modifying material.
[0006]
Furthermore, a plant having a density of 0.02 to 0.30 g / cm ³ is obtained by sucking and dewatering a slurry made of a composition containing cellulose fiber as a main component and having a freeness of 550 ml or more, followed by drying. 2. Description of the Related Art Molding media for raising and growing seedlings are known (for example, see Patent Document 3). In this molding medium for growing and growing plants, the cellulose fibers are subjected to at least one of a water-repellent treatment, a water-resistant treatment and a hardening treatment. Further, an interlayer strength enhancer composed of cellulose fine fibers is mixed with the slurry.
In the formed medium for growing plants and seedlings / growth thus constituted, a slurry containing cellulose fibers subjected to the above-described water repellency treatment as a main component and having a freeness of 550 ml or more was suctioned and dehydrated. Sometimes, the phenomenon of adhesion between cellulose fibers can be suppressed. As a result, an extremely low-density molding medium can be produced, so that a molding medium excellent in water absorption, water retention and air permeability can be obtained. In addition, by using a slurry containing an interlayer strength enhancer composed of cellulose fine fibers, the interlayer strength of the molding medium can be improved, so that breakage of the molding medium during transportation or the like can be prevented.
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-125455 [Patent Document 2]
JP 2001-31969 A [Patent Document 3]
JP-A-2000-232821
[Problems to be solved by the invention]
However, in the medium for raising rice seedlings described in Patent Literature 1 and the soil modifying material described in Patent Literature 2, since the bark of conifers is used, this bark is used as a seedling culture medium without any treatment. There was a problem that the root elongation of the seedling was poor.
Further, in the molding medium for plant growth and seedling / growth described in Patent Document 3, a step of preparing a slurry by subjecting cellulose fiber as a main component to a water-repellent treatment or the like, or mixing an interlayer strength enhancer with the slurry. In addition, since the culture medium is produced through many steps such as a step of drying the slurry and a step of sucking and dewatering the slurry, there is a problem that the number of working steps is increased and the production cost is increased.
[0009]
On the other hand, if there is no pathogenic bacterium, no disease will occur even under environmental conditions that are likely to cause disease. That is, in the current rice cultivation, many of the important diseases that need to be controlled, including blast, are seed-borne diseases, and these seed-borne diseases do not occur if the pathogenic bacteria are removed from the seeds. For this reason, an artificially coated rice brown rice seed that produces disease-free seeds in paddy rice and controls seed-borne diseases without using pesticides has been developed (Japanese Patent No. 2866921).
However, when the rice brown rice artificial coated seeds are raised using a normal seedling culture medium, the growth of the stem is slightly deteriorated due to poor root elongation, and it is easily broken when set in a rice transplanter to transplant the seedlings, There was a problem that the workability of rice planting was bad.
[0010]
An object of the present invention is to produce a cover soil or a floor soil and a cover soil with relatively few work steps of removing bark and pulverizing a cut conifer without performing any processing, and also capable of growing a root and It is an object of the present invention to provide a method for raising seedlings of a plant and a medium for raising seedlings capable of growing healthy seedlings with firm stems.
Another object of the present invention is to provide a method for raising seedlings of plants and a medium for raising seedlings capable of growing healthy seedlings not only from the artificially coated rice brown rice seeds, but also from normal rice fir seeds. .
[0011]
[Means for Solving the Problems]
As shown in FIG. 1, the invention according to claim 1 includes a step of laying floor soil 11 a in a nursery box 10, a step of sowing plant seeds 12 on the floor soil 11 a, And a step of covering the soil 11b.
The characteristic configuration is a chip having an average particle size of 0.1 to 10 mm, in which only the cover soil 11b or both the floor soil 11a and the cover soil 11b are made from softwood sapwood or a mixture of softwood sapwood and heartwood. Alternatively, the present invention provides a method for raising a seedling of a plant, which comprises chip dust.
[0012]
In the method for raising seedlings of plants according to this invention, only the covering soil 11b of the seedling culture medium 11 or the floor soil is obtained by a relatively simple operation of crushing the sapwood or sapwood and heartwood of the conifer from which the bark of the conifer is removed. 11a and the covering soil 11b can be produced. Also, if the sapwood or the sapwood and the heartwood chips or chip dust of the conifer are used as only the soil cover 11b or both the floor soil 11a and the cover soil 11b of the seedling growth medium 11, the sapwood growth promoting action or the sapwood growth promoting action is achieved. In addition, due to the good harmony of the growth suppressing effect of the heartwood, healthy seedlings with long roots and firm stems can be grown without careful management of seedlings. Furthermore, the sapwood and the heartwood of the conifer have a certain degree of bactericidal action, though not so much as the bark, so that propagation of various bacteria and the like generated on the surface of the seedling culture medium 11 can be suppressed, and more healthy seedlings can be grown.
[0013]
In the first aspect, the conifer is preferably one or more trees selected from the group consisting of cedar, pines and cypresses.
In the first aspect, the mixing ratio of the sapwood and the core material is preferably (60 to 100) :( 40 to 0).
Furthermore, in claim 1, the plant is rice, and even if the rice seed is a rice seed having a rice hull, or the rice seed is evacuated to substantially sterile rice brown rice, and the rice seed is coated with an artificial coating. It may be an artificially coated rice brown rice seed.
[0014]
The invention according to claim 6 is, as shown in FIG. 1, wherein only the cover soil 11 b or both the floor soil 11 a and the cover soil 11 b accommodated in the seedling raising box 10 are made of conifer sapwood or a mixture of conifer sapwood and heartwood. This is a plant seedling culture medium containing chips or chip dust having an average particle size of 0.1 to 10 mm prepared from.
[0015]
In the plant seedling culture medium according to the sixth aspect, only the cover 11b or both the floor soil 11a and the cover soil 11b of the seedling culture medium 11 are sapwood from which bark is removed or chips or chip dust of heartwood. With the use of sapwood, the growth promotion effect of sapwood, or the moderate harmony of the growth promotion effect of sapwood and the growth suppression effect of heartwood, allows the roots to grow and the stems to be healthy without the need for careful management of seedlings. Seedlings can grow. Also, the sapwood and heartwood of the conifer used only as the covering soil 11b of the seedling culture medium 11 or as both the floor soil 11a and the covering soil 11b have a certain bactericidal action, though not as good as the bark, and are generated on the surface of the seedling culture medium 11. Propagation of various bacteria can be suppressed, and healthy seedlings can be grown. Furthermore, the seedling raising medium 11 containing the above-mentioned chips and the like is lighter than the seedling raising medium composed of artificial granular soil, and can reduce the weight of the entire seedling raising box 10. Therefore, the seedling raising box 10 can be easily transported even by weak elderly people or women. .
[0016]
In claim 6, the conifer is preferably one or more trees selected from the group consisting of cedars, pines and cypresses.
In claim 6, the mixing ratio of the sapwood and the core material is preferably (60 to 100) :( 40 to 0).
Furthermore, in claim 6, even if the plant is rice, and the rice seed is a rice seed having a rice hull, or the rice seed is evacuated to substantially sterile rice brown rice, the rice seed is coated with an artificial coating. It may be an artificially coated rice brown rice seed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rice seedling culture medium 11 includes floor soil 11 a spread over a seedling raising box 10 and a cover soil 11 b overlaid on the floor soil 11 a. As the bed soil, artificial granulated soil having an average particle size of several mm, which is obtained by baking ordinary soil such as mountain soil for sterilization and then mixing fertilizer for raising seedlings, is used. In order to bake ordinary soil for sterilization, a flame such as a burner is usually sprayed on soil that is evenly placed on a conveyor so as to have a predetermined thickness. Fertilizers to be mixed with the artificial granular soil include nitrogenous fertilizers, phosphorus fertilizers, and potassium fertilizers.
[0018]
Note that, as the floor soil 11a, instead of artificial granular soil, a material containing chips or chip dust having an average particle size of 0.1 to 10 mm made from sapwood of softwood or a mixture of sapwood and heartwood of softwood is used. Is also good. In this case, a fertilizer, a pesticide, or the like may be mixed into the floor soil 11a containing the chips or chip dust, or a small amount of mountain soil or a small amount of artificial granular soil may be mixed. As the floor soil, a fertilizer-containing sheet made of rock wool containing calcium silicate or the like may be used instead of the artificial granular soil.
[0019]
On the other hand, as the covering soil 11b of the seedling culture medium 11, chips or chip dust having an average particle diameter of 0.1 to 10 mm made from sapwood of softwood or a mixture of sapwood and softwood of softwood are used. In this case, a fertilizer, a pesticide, or the like may be mixed into the covering soil 11b containing the chips or chip dust, or a small amount of mountain soil or a small amount of artificial granular soil may be mixed. As the conifer used for the floor soil 11a and the cover soil 11b, it is preferable to use one or more trees selected from the group consisting of cedar, pine, and hinoki. Examples of the pine include red pine, black pine, and larch, and examples of the hinoki include mouse, hinoki, sawara, hiba, and the like.
[0020]
The mixing ratio of the sapwood and the heartwood of the softwood is (60-100) :( 40-0), preferably (60-80) :( 40-20), and more preferably 70:30. Sapwood has a seedling growth promoting action, and heartwood has both a seedling growth promoting action and a growth inhibiting action. Here, the mixing ratio of the sapwood and the heartwood was limited to the range of (60-100) :( 40-0). When the mixing ratio was less than 60:40 (= 1.5), the ratio of the heartwood was too large, and This is because the growth becomes worse. The reason why the preferable range of the mixing ratio of the sapwood and the heartwood is (60-80) :( 40-20) is that the seedlings can be appropriately grown by the growth promotion action of the sapwood and the growth suppression action of the heartwood. is there. Further, the more preferable value of the mixing ratio of the sapwood and the heartwood is set to 70:30 because the ratio of the sapwood and the heartwood in the softwood is almost constant at 70:30, and the sapwood and the heartwood removed by removing the bark are used. This is because if pulverization is performed separately, the production cost is increased.
[0021]
In the present specification, chips or chip dusts having an average particle diameter of 0.1 mm or more and less than 5 mm, preferably 2 mm or more and less than 5 mm are referred to as chip dusts, and have an average particle diameter of 5 mm or more and less than 10 mm, preferably 5 mm. A chip having a length of 7 mm or less is called a chip. The reason why the average particle size of the chip dust is limited to 0.1 mm or more is that if it is less than 0.1 mm, it is blown off by a slight wind and is inconvenient to handle. The reason why the average particle diameter of the chips is limited to less than 10 mm is that if the average particle diameter is 10 mm or more, the gap between the chips is large, the chips are not settled down, and the chips are lifted by the force of germination.
[0022]
Further, as the rice seed 12 sown on the floor soil 11a, a normal rice seed having a rice husk is used. As the rice seed, not a normal rice seed having a rice hull, but a rice seed may be evacuated to obtain substantially sterile rice brown rice, and an artificially coated rice brown rice seed coated with an artificial coating may be used. In this case, by removing the rice seeds, the pathogenic bacteria that are latent in the rice hulls and cause seed-borne diseases (eg, blast, blight seedling disease, and bacterial blight disease) can be removed. Although many rice-borne diseases that occur in Honda are seed-borne diseases, the pathogens that cause this disease are latent in rice hulls. Even if the number of times of spraying is reduced, the occurrence of the seed-borne disease can be suppressed, and the amount of disinfectant used in Honda can be significantly reduced. The plant is not rice and may be a plant such as a vegetable or a flower if it is a plant that germinates from a seed.
[0023]
A method of raising rice seeds 12 using the thus-configured seedling culture medium 11 will be described.
First, the bark of the softwood is peeled off and completely removed, and only the sapwood or the sapwood and the heartwood are crushed, and only the cover soil 11b made of chips or chip dust having an average particle diameter of 0.1 to 10 mm or the floor soil 11a and the cover soil 11b is removed. Make it. The reason for completely removing the bark is that the bark has a very high growth inhibitory effect on the seedlings and inhibits the elongation of the roots of the seedlings. In addition, as a growth inhibitory substance of the seedling contained in the bark, polyphenol, serbinol, tannin and the like can be considered. The conifers may use not only the trunk but also branches (thinned wood), and the chips or chip dust may be sawdust of wood (carved from conifers) generated in a sawmill. Further, the mixing ratio of the sapwood and the core material is preferably (60 to 100) :( 40 to 0).
[0024]
Next, the seedling box 10 is laid with artificial granular soil or floor soil made of the coniferous chips or chip dust, the rice seeds 12 are sown on the floor soil 11a of the seedling raising box 10, and the covering soil 11b made of chips or chip dust is further laid. It covers the floor soil 11a and the rice seeds 12. Thereafter, an appropriate amount of water is poured from above the covering soil 11b of the seedling culture medium 11 in the seedling raising box 10 to allow the chips or chip dust to sufficiently absorb moisture. Next, the seedling raising box 10 is kept in a seedling incubator having a temperature of 28 to 32 ° C. and a humidity of almost 100% for about 3 days to germinate, and then is transported to a plastic greenhouse or immediately without being accommodated in the seedling incubator. Convey to a greenhouse and hang a warm cloth or vinyl until budding. Further, when the rice seedlings grow and reach the time of transplantation to Honda, the rice seedlings are transplanted to Honda using a rice transplanter. With such a relatively simple operation, healthy seedlings can be grown from the rice seeds 12.
[0025]
As described above, if chips or chip dusts of conifer sapwood and heartwood are used for only the cover soil 11b of the seedling culture medium 11 or for both the floor soil 11a and the cover soil 11b, the effect of promoting the growth of the sapwood and the effect of suppressing the growth of the heartwood are obtained. Even if the greenhouse where the seedlings grow is high in room temperature or humidity, the stems of the seedlings do not become too long and the seedlings do not grow long and the roots grow and the stems do not grow fine even if the seedlings are not carefully managed. You can grow healthy seedlings. As a result, the transplanting operation of the seedlings into the Honda by the rice transplanter can be easily performed, and the seedlings grow smoothly in the Honda. If the stems of the seedlings become too long, there is a problem that the seedlings fall down when transplanting the seedlings to the rice with a rice transplanter, or the growth of the seedlings in the Honda becomes poor.
[0026]
The sapwood and heartwood of conifers, though not as good as bark, have a certain degree of bactericidal action, so that propagation of germs and the like generated on the surface of the covering soil 11b can be suppressed, and healthy seedlings can be grown.
When the above-mentioned chips and the like are used only as the covering soil 11b of the seedling culture medium 11 or as both the floor soil 11a and the covering soil 11b, the weight is reduced as compared with the case where the artificial granular soil is used, so that the weight of the entire seedling raising box 10 can be reduced. As a result, the nursery box 10 can be easily transported even by weak elderly people or women.
[0027]
Furthermore, since the bark containing various soil pathogens that cause seedling blight, etc. is peeled off and only sapwood or sapwood and heartwood that do not contain this soil pathogen are used, ordinary rice fir seeds and rice brown rice artificial coating are used. For seeds, there is no need to mix a controlling agent into the floor soil 11a and the covering soil 11b of the seedling raising box 10. As a result, since the pesticide does not need to be used, the waste liquid treatment of the pesticide becomes unnecessary, and the problem of water pollution by the pesticide can be solved.
[0028]
【Example】
Next, examples of the present invention will be described in detail together with comparative examples.
<Example 1>
As shown in FIG. 1, first, the bark of the cedar was peeled and completely removed, and the sapwood and the heartwood were pulverized to prepare a seedling culture medium 11 composed of chips or chip dust having an average particle size of 2 to 7 mm. The mixing ratio of the sapwood and the core was 70:30. Next, the seedling box 10 is laid with floor soil 11a made of ordinary artificial granular soil using mountain soil, and the normal rice seeds 12 (fir seeds) having rice hulls are sown on the floor soil 11a. Alternatively, the covering soil 11b made of chip dust was covered on the floor soil 11a and the rice seeds 12. In this state, an appropriate amount of water was poured from above the covering soil 11b made of chips or chip dust, so that the chips or chip dust were sufficiently absorbed in moisture. A nursery box 10 using the seedling culture medium 11 and in which rice seeds 12 were sown was designated as Example 1.
[0029]
<Example 2>
Same as Example 1 except that the bark of Pinus densiflora (pine) was completely removed as cover soil, and sapwood and heartwood were crushed to use chips or chip dust having an average particle size of 2 to 7 mm. Then, rice seedlings were grown. A seedling box using the seedling culture medium and seeded with rice seeds was designated as Example 2.
<Example 3>
Same as Example 1 except that the bark of kittens (cypresses) was completely removed as cover soil, and sapwood and heartwood were crushed to use chips or chip dust having an average particle size of 2 to 7 mm. Then, rice seedlings were grown. A nursery box using this seedling culture medium and in which rice seeds were sown was designated as Example 3.
[0030]
<Comparative Example 1>
Rice seedlings were grown in the same manner as in Example 1 except that ordinary artificial granular soil was used as the floor soil and cover soil of the seedling culture medium. A seedling box using this seedling culture medium and seeded with rice seeds was designated as Comparative Example 1.
[0031]
<Comparative test 1 and evaluation>
After the seedling boxes of Examples 1 to 3 and Comparative Example 1 were stored in a seedling incubator at a temperature of 32 ° C. and a humidity of 100% for 3 days and allowed to germinate, the seedlings were conveyed to a greenhouse and kept in the greenhouse for 11 days ( Two weeks after sowing), the number and length of roots of rice seedlings, the height of stem (plant height), and the leaf age were measured. The results are shown in FIGS.
As is clear from FIG. 2, the average number of roots of rice seedlings was 5.2 in Comparative Example 1, whereas the average number of roots was 7.3 and 7.8 in Examples 1 to 3, respectively. The average was 5.2, which was equal to or larger than Comparative Example 1. As is clear from FIG. 3, the root length of rice seedlings was as short as 8.4 cm on average in Comparative Example 1, whereas the length of roots of Examples 1 to 3 was 12.0 cm and 13.8 cm on Examples 1 to 3, respectively. The average length was 9.7 cm. As is clear from FIG. 4, the height (plant height) of rice stalks was 15.4 cm on average in Comparative Example 1, whereas 20.7 cm, 15.4 cm on average in Examples 1 to 3, respectively. The average was 15.5 cm, which was equal to or longer than Comparative Example 1, and the stems of Examples 1 to 3 were firmer than the stem of Comparative Example 1. Further, as is clear from FIG. 5, the leaf age of rice was 1.8 leaves in average in Comparative Example 1, whereas 2.0 leaves, 2.0 leaves and 2.0 leaves in Examples 1 to 3, respectively. 1.8 leaves were almost the same as Comparative Example 1.
[0032]
<Comparative Example 2>
As covering soil, the bark of oak (hardwood) was completely removed, and the sapwood and heartwood were crushed to use chips or chip dust having an average particle size of 2 to 7 mm. The rice seedlings were grown. A seedling box using this seedling culture medium and seeded with rice seeds was designated as Comparative Example 2.
[0033]
<Comparative test 2 and evaluation>
The seedling raising boxes of Example 1 and Comparative Example 2 were stored in a seedling incubator at a temperature of 32 ° C. and a humidity of 100% for 3 days to germinate in the same manner as in Comparative Test 1, and then transported to a plastic greenhouse. 6 and 7 show the growth of the roots of the rice seedlings when they were kept for 11 days (2 weeks after sowing), and the seedlings when they were kept for 18 days in a plastic greenhouse (3 weeks after sowing). FIGS. 8 and 9 show the growth state of the roots.
As is clear from FIGS. 6 and 7, when the plants were kept in a greenhouse for 11 days (two weeks after sowing), the roots of the seedlings were short in Comparative Example 2 (FIG. 7), but long in Example 1. (Fig. 6). As is clear from FIGS. 8 and 9, when the seedlings were kept in the greenhouse for 18 days (3 weeks after sowing), the roots of the seedlings did not grow much in Comparative Example 2 and the number thereof was small (FIG. 9). On the other hand, in Example 1, the number of elongated pieces was long (FIG. 8). Therefore, from the above comparative tests 1 and 2, it was found that in Examples 1 to 3, healthy roots with good root elongation and firm stems could be grown.
[0034]
【The invention's effect】
As described above, according to the present invention, only the cover of the seedling culture medium or both the floor soil and the cover soil have an average particle size of 0.1 produced from conifer sapwood or a mixture of conifer sapwood and heartwood. 10 to 10 mm containing chips or chip dust, laying the above-mentioned floor soil in a nursery box, sowing plant seeds on this floor soil, and further covering the above-mentioned soil on the floor soil and seeds, so that the growth of conifer sapwood By virtue of the promoting action or the good harmony between the growth promoting action of the sapwood and the growth suppressing action of the heartwood, a healthy seedling with well-rooted and firm stems can be grown without careful management of the seedlings. As a result, the operation of transplanting the seedlings into the Honda or the field by the rice transplanter can be easily performed, and the seedlings in the Honda grow smoothly.
[0035]
Also, the bark of the conifer that has been cut can be removed without any treatment, and the cover can be made by a relatively simple operation of crushing the sapwood or sapwood and heartwood of the conifer, or making the floor and cover soil. Since it is possible to apply a water-repellent treatment or the like to the cellulose fibers, mix the interlayer strength enhancer with the slurry, further suction and dewater the slurry, and then dry it after drying and drying, with the conventional molding medium for plant seedling and growth. In comparison, the production cost of the seedling culture medium of the present invention is small.
Also, the sapwood and heartwood of conifers have a certain degree of bactericidal action, though not as much as the bark, so that propagation of various bacteria and the like generated on the surface of the seedling culture medium can be suppressed, and healthy seedlings can be grown.
[0036]
In addition, the seedling culture medium using chips or chip dust such as sapwood of conifers is lighter than the seedling culture medium using artificial granular soil, so that the weight of the entire seedling box can be reduced. As a result, the nursery box can be easily transported by weak elderly people or women.
Also, since only the sapwood or the sapwood and heartwood from which the bark of the coniferous tree is removed is used for only the soil of the seedling culture medium or both the floor soil and the soil, it does not contain various soil pathogenic bacteria causing seedling blight, etc. There is no need to mix a control agent into the seedling culture medium in the box. As a result, since the pesticide does not need to be used, the waste liquid treatment of the pesticide becomes unnecessary, and the problem of water pollution by the pesticide can be solved.
[0037]
In addition, by using rice-brown rice artificially coated seeds, in which the rice husks latent for the pathogen causing the seed-borne disease are removed and coated with an artificial coating, the seed-borne disease can be reduced even if the frequency of disinfectant spraying in Honda is reduced. Can be suppressed. As a result, the amount of disinfectant used in Honda can be significantly reduced.
Further, only the covering soil or both the floor soil and the covering soil accommodated in the seedling raising box are made of chips or chip dust having an average particle size of 0.1 to 10 mm made from sapwood of softwood or a mixture of sapwood and softwood of softwood. If it is included, not only rice seeds, but also seeds such as vegetables and flowers can provide the same effects as described above.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a procedure for accommodating a seedling culture medium and rice brown rice in a seedling raising box according to an embodiment of the present invention.
FIG. 2 is a diagram comparing the numbers of roots (two weeks after sowing) of rice seedlings of Examples 1 to 3 and Comparative Example 1.
FIG. 3 is a diagram comparing the root lengths (two weeks after sowing) of rice seedlings of Examples 1 to 3 and Comparative Example 1.
FIG. 4 is a diagram comparing the height (plant height) (two weeks after sowing) of stems of rice seedlings of Examples 1 to 3 and Comparative Example 1.
FIG. 5 is a diagram comparing the leaf ages (two weeks after sowing) of rice seedlings of Examples 1 to 3 and Comparative Example 1.
FIG. 6 is a photograph showing the root state (two weeks after sowing) of rice seedlings of Example 1.
FIG. 7 is a photograph showing the root state (two weeks after sowing) of rice seedlings of Comparative Example 2.
FIG. 8 is a photograph showing the root state (three weeks after sowing) of rice seedlings of Example 1.
FIG. 9 is a photograph showing the root state (3 weeks after sowing) of rice seedlings of Comparative Example 2.
[Explanation of symbols]
10 Nursery box 11 Nursery culture medium 11a Floor soil 11b Cover soil 12 Rice seeds (plant seeds)

Claims (10)

A step of laying floor soil (11a) in a seedling raising box (10); a step of sowing plant seeds (12) on the floor soil (11a); and a cover soil on the floor soil (11a) and the seeds (12). (11b) the step of covering the plant,
The covering soil (11b) alone or the floor soil (11a) and the covering soil (11b) are both made of a softwood sapwood or a mixture of the softwood sapwood and a heartwood having an average particle size of 0.1 to 10 mm. A method for raising a seedling of a plant, comprising a chip or a chip dust. 2. The method for raising a plant according to claim 1, wherein the conifer is one or more trees selected from the group consisting of cedars, pines and cypresses. The method according to claim 1, wherein the mixing ratio of the sapwood and the heartwood is (60-100) :( 40-0). The method according to claim 1, wherein the plant is rice and the rice seed (12) is a rice seed having a rice husk. 2. The method for raising a plant according to claim 1, wherein the plant is rice, and the rice seeds are evacuated to substantially sterile rice brown rice, and the rice brown rice artificially coated seed is further coated with an artificial coating. Average grain made of only the cover soil (11b) or both the floor soil (11a) and the cover soil (11b) contained in the seedling raising box (10) from sapwood of softwood or a mixture of sapwood and heartwood of the softwood. A seedling culture medium for plants containing chips or chip dust having a diameter of 0.1 to 10 mm. The seedling culture medium for plants according to claim 6, wherein the conifer is one or more trees selected from the group consisting of cedar, pine, and hinoki. The medium for raising a seedling of a plant according to claim 6, wherein the mixing ratio of the sapwood and the heartwood is (60-100) :( 40-0). 7. The medium according to claim 6, wherein the plant is rice and the rice seed (12) is a rice seed having a rice husk. 7. The seedling culture medium for a plant according to claim 6, wherein the plant is rice, and the rice seeds are evacuated to substantially sterile rice brown rice, and the rice brown rice artificially coated seed is further coated with an artificial coating.

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