JP5044453B2 - Granules for rice seedling boxes - Google Patents

Description

  The present invention relates to a rice seedling box applied granule in which the phytotoxicity of rice seedlings is reduced throughout the whole seedling period from seeding of rice seed pods to seedling boxes to transplanting of seedlings to Honda.

  When using an agrochemical, it is preferable to reduce the usage-amount or the frequency | count of use of an agrochemical from a viewpoint of labor saving and reduction of an environmental load. In response to these requests, paddy rice farming applies the agricultural chemicals used in Honda to the seedling box, and after transplanting, the seedling box processing to show its effect in the rice field, and when transplanting seedlings to Honda, the rice planting machine At the same time, an attachment is attached to the pesticide and the pesticide is buried in the soil in the vicinity of the seedling. However, if normal granular pesticides are treated during this period when the seedlings are young, rooting or root elongation is inhibited by the active or other ingredients that are eluted or released, resulting in phytotoxicity such as delayed growth or death of seedlings. There was a case. Therefore, development of a seedling box treatment agent that is labor-saving and does not cause phytotoxicity on young seedlings during the seedling raising period is desired.

  Examples of preparations capable of treating seedling boxes in which phytotoxicity caused by specific agrochemical active ingredients are reduced by addition of acidic substances include: (1) Sterilization composition for rice seedling boxes containing probenazole and acid (Patent Document 1), (2 ) Agrochemical granules containing a nereistoxin derivative or a salt thereof, an inorganic acid and acidic clay (Patent Document 2) have been reported. However, these preparations have the disadvantage that, when exposed to adverse conditions such as low temperatures during the seedling period, the acidic substances added for the purpose of reducing the phytotoxicity cause phytotoxicity to rice seedlings. In addition, these preparations are all limited to specific agrochemical active ingredients, and can they be applied to other various agrochemical active ingredients that have not been treated in a nursery box due to phytotoxicity and have been subjected to Honda control. Whether it is unknown.

  Moreover, although the component extracted from (3) wood vinegar liquid or / and wood vinegar, and the healthy seedling breeding agent (patent document 3) which consists of an acidic substance are reported, growth of rice seedling growth and seedling quality improvement are reported. It is an intended agent, not an agent aimed at reducing phytotoxicity of rice seedlings. Further, (4) as a preparation using both an acidic substance and anhydrous sodium sulfate, for example, one or more selected from the group of solid organic acid and boric acid at room temperature having a solubility in water at 20 ° C. of 3% or less There has been reported a sodium sulfate tablet (Patent Document 4) excellent in shape retaining property obtained by compounding a compound at a ratio of 3 to 70% by weight with respect to sodium sulfate and press-molding. However, it is intended to improve the tablet shape retention, and is not intended to promote rooting and root elongation, or reduce phytotoxicity.

Japanese Patent No. 3047744 JP 2001-72515 A JP-A-56-59702 JP-A-11-147840

  An object of the present invention is to provide a rice seedling box application granular material in which the phytotoxicity of rice seedlings is reduced throughout the entire seedling raising period.

The present inventors have intensively studied to solve the above object. As a result, it was found that the combined use of orthophosphoric acid and anhydrous sodium sulfate reduces the phytotoxicity of rice seedlings throughout the whole seedling period from seeding of rice seedlings to seedling boxes to transplanting of seedlings to Honda. Completed the invention. That is, the gist of the present invention is as follows.
(1) A rice seedling box applied granule comprising an agrochemical active ingredient, orthophosphoric acid, anhydrous sodium sulfate, and a solid carrier.
(2) The rice seedling box application according to (1) above, wherein the weight ratio of the contents of orthophosphoric acid and anhydrous sodium sulfate in the granule for rice seedling box application is 1: 0.3 to 1:10 Granules.

  The rice seedling box applied granular material of the present invention is applied to rice seedlings during the seedling period with high sensitivity to agricultural chemical active ingredients, or even if a higher dose than conventional is applied, or there is a risk of chemical damage Even if it is exposed to adverse conditions such as low temperature during the seedling period, the added acidic substance does not cause harm to the plant. Furthermore, by adding orthophosphoric acid and anhydrous sodium sulfate at a certain ratio, anhydrous sodium sulfate keeps orthophosphoric acid uptake into the plant over a long period of time. Can reduce the phytotoxicity of rice seedlings throughout the whole seedling period until transplanting to Honda. For this reason, it is possible to apply a nursery box of an agrochemical active ingredient that has been subjected to pest control since it could not be treated due to chemical damage or a pesticide active ingredient that could only be used at a low dose that does not cause any chemical damage.

  The rice seedling box applied granule of the present invention is characterized by containing a) an agrochemical active ingredient, b) orthophosphoric acid, c) anhydrous sodium sulfate, and d) a solid carrier. Of these, the weight ratio of the content of orthophosphoric acid and anhydrous sodium sulfate is preferably 1: 0.3 to 1:10. If the weight ratio of the content is outside this range, rice rooting / stretch inhibition is likely to occur, and the rice roots are entangled with each other (mat), resulting in poor formation and raising seedlings. There are problems such as being unable to relocate to a rice planting machine.

Below, the rice seedling box application granular material of this invention is demonstrated in detail.
a) Agrochemical active ingredient The agrochemical active ingredient that can be used in the present invention may be one that is usually used for rice cultivation, and may be used alone or in combination of two or more. Examples of such pesticidal active ingredients include the following.
Examples of insecticides include organophosphorus, carbamate (eg, benfuracarb, fenobucarb), pyrethroid, nereistoxin (eg, cartap), neonicotinoid (eg, thiamethoxam), chloronicotinoid, phenyl Examples include pyrazole-based and benzoylphenylurea-based synthetic insecticides, and natural insecticides.
Examples of bactericides include inorganic copper agents, organic copper agents, inorganic sulfur agents, organic sulfur agents, melanin biosynthesis inhibitors (eg, pyroxylone), organophosphorus, benzimidazole, dicarboximide, and acid amides. , Triazole, imidazole, methoxyacrylate, strobilurin, anilinopyrimidine, dithiolane, quinoxaline, aminopyrimidine, phenylpyrrole, triazine, cyanoacetamide, anilide, guanidine fungicides and antibiotics Substance-based fungicides (for example, kasugamycin), natural product fungicides, and the like can be mentioned.
Each specific agrochemical active ingredient contained in these is described in, for example, “Agricultural Chemicals Handbook 2005” (issued on October 11, 2005 by the Japan Plant Protection Association).
The pesticidal active ingredient used in the present invention is not limited to the above, and other components can be applied if necessary.
The content of these pesticidal active ingredients is usually 0.01 to 90% by weight, preferably 0.1 to 50% by weight, more preferably 0.5 to 30% by weight, based on the preparation.

b) About orthophosphoric acid The orthophosphoric acid that can be used in the present invention is not particularly limited as long as it is commercially available such as a special grade of phosphoric acid (purity 85% or more, manufactured by Kanto Chemical Co., Ltd.). . Further, as the content of orthophosphoric acid in the present invention, if the content is too small, the effect of reducing phytotoxicity and promoting root root elongation cannot be obtained. Therefore, it is preferably 0.05 to 5% by weight, because there are problems such as adversely affecting plants and workers, and depending on the active ingredient, the stability may be deteriorated. 2% by weight is preferred.

c) Anhydrous sodium sulfate An anhydrous sodium sulfate that can be used in the present invention is not particularly limited as long as it is commercially available as anhydrous sodium sulfate, such as sodium sulfate special grade (purity 99% or more, manufactured by Kanto Chemical Co., Ltd.). It is not something.

d) Solid Carrier Examples of the solid carrier that can be used in the present invention include a water-insoluble solid carrier and a water-soluble solid carrier.
Examples of water-insoluble solid carriers include clay, silica sand and pulverized products thereof, diatomaceous earth, bentonite, talc, dikelite, sericite, acid clay, activated clay, quartzite, pumice, zeolite, vermiculite, white carbon, shirasu balloon, etc. And an inorganic carrier such as a vitreous powder obtained by pulverizing the powder, and an organic carrier such as cellulose, pulp, rice bran, wood flour, starch, and soybean flour.
Examples of the water-soluble solid carrier include ammonium sulfate, potassium chloride, calcium carbonate, urea, glucose, sucrose, fructose, and lactose.
The solid carrier is not limited to these, and one or more of these may be used in combination.
The content of these solid carriers is usually 0.1 to 99% by weight, preferably 0.5 to 99% by weight, more preferably 1 to 99% by weight, based on the preparation.

  In the rice seedling box applied granule of the present invention, a surfactant, a binder, a solvent, an auxiliary agent, and the like may be included as necessary. The content (total) of these other contents is usually 0 to 40% by weight, preferably 0 to 30% by weight, based on the total amount of the preparation.

As the surfactant, a nonionic surfactant, an anionic surfactant, a cationic surfactant, a double-sided surfactant, or the like is used.
For example, nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene stynyl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer , Polyoxyethylene alkylene aryl phenyl ether, polyoxyethylene alkylene glycol, polyoxyethylene polyoxypropylene block polymer and the like.
Anionic surfactants include lignin sulfonate, alkyl aryl sulfonate, dialkyl sulfo succinate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene stynyl phenyl ether sulfate, lauryl sulfate Etc.
Examples of the cationic surfactant include alkyl trimethyl ammonium salts, alkyl dimethyl benzyl ammonium salts, and alkyl pyridinium salts.
Examples of the double-sided activator include dialkyldiaminoethylbetaine and alkyldimethylbenzylbetaine. However, the surfactant that can be used in the present invention is not limited to these exemplifications, and there is no problem even if one type or two or more types are used in combination.

  Examples of binders that can be used in the present invention include natural, semi-synthetic and synthetic polymers. Examples of natural products include starch, pullulan, sodium alginate, dextran, mannan, pectin, tragacanth gum, curdlan, sorbitol, guar gum, roast cast bean gum, gum arabic, xanthan gum, gelatin, casein and the like. Examples of the semi-synthetic system include dextrin, soluble starch, oxidized starch, pregelatinized starch, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and the like. Examples of the synthetic system include polyvinyl alcohol, polyacrylamide, sodium polyacrylate, polyvinyl pyrrolidone, polyethylene glycol, ethylene-acrylic acid copolymer, maleic anhydride copolymer, and the like. The binder in this invention is not restricted to these illustrations, and even if it uses 1 type or 2 types or more together, there is no problem.

  Examples of the solvent that can be used in the present invention include Solvesso 150 (trade name, manufactured by Exxon Chemical Co., Ltd.), Hysol E, Hysol F (trade name, manufactured by Nippon Oil Corporation), Cactus solvent P100, Cactus solvent P150, and Cactus solvent. P187, Cactus solvent P200 (trade name manufactured by Nippon Mining Co., Ltd.), Alkene 56N, Alkene 60NH, Alkene L (trade name manufactured by Nippon Petrochemical Co., Ltd.) and other alkylbenzene solvents, Cactus solvent 220, Cactus solvent P240 (Japan) Trade name manufactured by Mining Co., Ltd.), Solvesso 200 (trade name manufactured by Exxon Chemical Co., Ltd.), purified methylnaphthalene (manufactured by Sumikin Kako Co., Ltd.), diisopropyl naphthalene (trade name “KMC-113” manufactured by Kureha Chemical Industry Co., Ltd.) Archi Naphthalene solvents, isoparaffin (trade name “Isosol 300” manufactured by Nippon Petrochemical Co., Ltd.), paraffin solvents such as liquid paraffin and n-paraffin, naphthesol (manufactured by Nippon Petrochemical Co., Ltd.), Exsol (manufactured by Exxon Chemical Co., Ltd.) Naphthenic solvents such as trade name), ether solvents such as propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, diethylene glycol mono-n-butyl ether, 3-methyl-3-methoxybutanol, 3-methyl-3-methoxybutyl acetate Alcohol solvents such as 3-methyl-1,3-butanediol, alkylpyrrolidone solvents such as N-methylpyrrolidone, n-octylpyrrolidone and n-dodecylpyrrolidone, DuPont DBE Product name), ditridecyl phthalate, diisodecyl adipate, didecyl phthalate, didecyl phthalate, dialkyl phthalate (C10-C12), trimellitic acid tri-2-ethylhexyl, trimellitic acid tri-normal alkyl (C8-C10) ) Tribasic acid tri-2-ethylhexyl, trimellitic acid trialkyl (C9), trimellitic acid triisodecyl, polybasic acid ester solvents such as dioleyl adipate, isobutyl oleate, methyl palm fatty acid, methyl laurate, palm fatty acid Fatty acid esters such as methyl, isopropyl palmitate, isotridecyl stearate, 2-ethylhexyl stearate, methyl oleate, octyl oleate, lauryl oleate, decyl oleate, etc. Solvents such as aromatic hydrocarbon solvents, aromatic hydrocarbon solvents based on triallyldiethane, rice bran oil fatty acid methyl ester, rapeseed oil, soybean oil, castor oil, cottonseed oil, corn oil However, it is not limited to these, and there is no problem even if one of these is used or two or more are used in combination.

  Adjuvants that can be used in the present invention include stabilizers such as antioxidants, UV inhibitors, and crystal precipitation inhibitors, sorbic acid, potassium sorbate, p-chloro-m-xylenol, p-butyl oxyoxybenzoate, and the like. And anti-corrosion agent, and pH adjusters such as citric acid, calcium carbonate and magnesium carbonate.

  The rice seedling box applied granule of the present invention can be obtained by a granulation method usually used in the formulation of agricultural chemicals. For example, add agrochemical active ingredients, orthophosphoric acid, anhydrous sodium sulfate and solid carrier, surfactants, binders, solvents, adjuvants, etc. as necessary, and mix with a hammer mill (trade name, manufactured by Fuji Powder Co., Ltd.) After pulverization, it is hydro-kneaded, granulated using an extrusion granulator, dried with a fluid bed dryer, and sized. In addition, it may be granulated with a tumbling granulator while adding water to the powder mixture, dried and sized, or sprayed with a binder, an aqueous solution or an active ingredient while flowing the powder mixture. It can also be produced by a fluidized bed granulator for granulating.

  Moreover, as a dosage form which the granule for rice seedling box application of this invention can take, if it is solid preparations other than powder form, such as a granule, a granule, and a tablet, it will not receive a restriction | limiting at all.

EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. In the following examples and comparative examples, “part” means “part by weight”.
[Example 1] 2.0 parts of kasugamycin base, 0.5 parts of orthophosphoric acid, 0.5 parts of anhydrous sodium sulfate, 97.0 parts of clay to make a total of 100 parts, using a hammer mill (manufactured by Fuji Powder Co., Ltd.) Mixed to be uniform. 11.0 parts of water was added to the mixed pulverized product and kneaded with a double-arm kneader (manufactured by Fuji Powder Co., Ltd.).
Next, this hydro-kneaded product was granulated by an extrusion granulator equipped with a basket type screen having a pore diameter of 1.0 mm. The obtained granulated material was dried with a fluidized bed dryer (Fuji Paudal Co., Ltd.) and then sieved with a sieve having a diameter of 1.7 mm to 850 μm to obtain a rice seedling box application granule.

[Example 2] Except that the amount of orthophosphoric acid added in Example 1 was 1.5 parts and the clay was 96.0 parts, prepared according to the preparation method of Example 1, Obtained.
[Example 3] Except that the amount of anhydrous sodium sulfate added in Example 1 was 5.0 parts and the clay was 92.5 parts, prepared in accordance with the preparation method of Example 1, Obtained.
[Example 4] Except that the amount of orthophosphoric acid added in Example 1 was 0.1 part and the clay was 97.4 parts, prepared according to the preparation method of Example 1, Obtained.
[Example 5] According to the preparation method of Example 1, except that the amount of orthophosphoric acid added in Example 1 was 2.0 parts, the amount of anhydrous sodium sulfate was 2.0 parts, and the clay was 94.0 parts. The rice seedling box application granular material was obtained.
[Example 6] According to the preparation method of Example 1, except that the amount of orthophosphoric acid added in Example 1 was 5.0 parts, the amount of anhydrous sodium sulfate was 2.0 parts, and the clay was 91.0 parts. The rice seedling box application granular material was obtained.

[Example 7] Except that the amount of anhydrous sodium sulfate added in Example 1 was 0.1 part and the clay was 97.4 parts, prepared according to the preparation method of Example 1, Obtained.
[Example 8] Except that the amount of anhydrous sodium sulfate added in Example 1 was 7.0 parts and clay was 90.5 parts, prepared according to the preparation method of Example 1, Obtained.
[Example 9] Prepared according to the preparation method of Example 1 except that 0.5 part of polyoxyethylene alkyl ether as a surfactant was added to Example 1 to make 96.5 parts of clay. A granular material for nursery box application was obtained.
[Example 10] Rice seedlings were prepared according to the preparation method of Example 1, except that 0.5 part of dioctylsulfosuccinate as a surfactant was added to Example 1 and clay was 96.5 parts. A box application granulate was obtained.
[Example 11] Except for adding 5.0 parts of polyvinyl alcohol as a binder to Example 1 and using 92.0 parts of clay, it was prepared according to the preparation method of Example 1 and was applied to rice seedling box application granules. I got a thing.

[Example 12] Prepared according to the preparation method of Example 1 except that 5.0 parts of carboxymethylcellulose was added to Example 1 as a binder and 92.0 parts of clay was used. I got a thing.
[Example 13] Example 1 except that 0.5 parts of polyoxyethylene alkyl ether as a surfactant and 5.0 parts of polyvinyl alcohol as a binder were added to Example 1 to make clay 91.5 parts. To prepare a rice seedling box applied granule.
[Examples 14 to 17] Preparation of Example 1 except that the solid carrier of Example 1 was 97.0 parts of diatomaceous earth, 97.0 parts of zeolite, 97.0 parts of calcium carbonate, and 97.0 parts of lactose, respectively. It was prepared according to the method to obtain a rice seedling box application granule.
[Example 18] Except that the active ingredient of agricultural chemical of Example 1 was 12.0 parts of Pyroxylone and 87.0 parts of clay was prepared according to the preparation method of Example 1, Obtained.
[Example 19] Except that the agricultural chemical active ingredient of Example 3 was 12.0 parts of Pyroxylone and 82.5 parts of clay was prepared in accordance with the preparation method of Example 1, Obtained.

[Example 20] A rice seedling box applied granule was prepared according to the preparation method of Example 1, except that 12.0 parts of pesticide active ingredient in Example 6 and 81.0 parts of clay were used. Obtained.
[Example 21] Granules for rice seedling box preparation, prepared according to the preparation method of Example 1, except that 12.0 parts of pesticide active ingredient of Example 16 and 87.0 parts of calcium carbonate were used. Got.
[Examples 22 to 29] Prepared according to the preparation method of Example 1 except that the agricultural chemical active ingredients of Examples 1 to 8 were 4.0 parts of Cartap and the amount of clay was adjusted so that the total amount was 100 parts. Then, a granular material for rice seedling box application was obtained.
[Example 30] Except that the agricultural chemical active ingredient of Example 9 is 4.0 parts of Cartap and the clay is 94.5 parts, prepared according to the preparation method of Example 1, Obtained.
[Example 31] Prepared according to the preparation method of Example 1 except that the agricultural chemical active ingredient of Example 11 was 4.0 parts Cartap and 90.0 parts of clay. Obtained.

[Example 32] Except that the agricultural chemical active ingredient of Example 13 was 4.0 parts of Cartap and the clay was 89.5 parts, prepared according to the preparation method of Example 1, Obtained.
[Examples 33-36] The preparation of Example 1 except that the solid support of Example 22 was 95.0 parts of diatomaceous earth, 95.0 parts of zeolite, 95.0 parts of calcium carbonate, and 95.0 parts of lactose, respectively. It was prepared according to the method to obtain a rice seedling box application granule.
[Example 37] Except that the agricultural chemical active ingredient of Example 1 was 2.0 parts of thiamethoxam, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule.
[Example 38] Except that the active ingredient of agricultural chemical of Example 3 was 2.0 parts of thiamethoxam, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule.
[Example 39] Except that the active ingredient of agricultural chemical of Example 6 was 2.0 parts of thiamethoxam, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule.
[Example 40] Except that the agricultural chemical active ingredient of Example 16 was 2.0 parts of thiamethoxam, it was prepared in accordance with the preparation method of Example 1 to obtain a rice seedling box application granule.

[Comparative Example 1] A total of 100 parts of 2.0 parts of kasugamycin and 98.0 parts of clay was mixed and mixed uniformly with a hammer mill (manufactured by Fuji Powder Co., Ltd.). 11.0 parts of water was added to the mixed pulverized product and kneaded with a double-arm kneader (manufactured by Fuji Powder Co., Ltd.).
Next, this hydro-kneaded product was granulated by an extrusion granulator equipped with a basket type screen having a pore diameter of 1.0 mm. The obtained granulated material was dried with a fluidized bed dryer (Fuji Paudal Co., Ltd.) and then sieved with a sieve having a diameter of 1.7 mm to 850 μm to obtain a rice seedling box application granule.

[Comparative Example 2] Prepared according to the preparation method of Example 1 except that 0.05 part of orthophosphoric acid was added to Comparative Example 1 to make 97.95 parts of clay to obtain a rice seedling box applied granule. It was.
[Comparative Example 3] Except that the orthophosphoric acid of Comparative Example 2 was 0.5 part and the clay was 97.5 parts, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule. .
[Comparative Example 4] Except that the orthophosphoric acid of Comparative Example 2 was 5.0 parts and the clay was 93.0 parts, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule. .
[Comparative Example 5] Except that the orthophosphoric acid of Comparative Example 2 was 10.0 parts and the clay was 88.0 parts, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box application granule. .
[Comparative Example 6] Prepared in accordance with the preparation method of Example 1 except that 0.1 part of anhydrous sodium sulfate was added to Comparative Example 1 to make 97.9 parts of clay, and a rice seedling box application granule was obtained. It was.

[Comparative Example 7] Except that 0.5 parts of anhydrous sodium sulfate of Comparative Example 6 was used and 97.5 parts of clay was prepared according to the preparation method of Example 1, a granular material for rice seedling box application was obtained. .
[Comparative Example 8] Except that 5.0 parts of anhydrous mirabilite of Comparative Example 6 and 93.0 parts of clay were used, preparation was performed according to the preparation method of Example 1 to obtain a rice seedling box application granule. .
[Comparative Example 9] Except for using 12.0 parts of pesticide active ingredient in Comparative Example 1 and 88.0 parts of clay, prepared in accordance with the preparation method of Example 1, Obtained.
[Comparative Example 10] A rice seedling box applied granule was prepared according to the preparation method of Example 1 except that 12.0 parts of pesticide active ingredient of Comparative Example 3 and 87.5 parts of clay were used. Obtained.
[Comparative Example 11] A rice seedling box applied granule was prepared according to the preparation method of Example 1 except that the agrochemical active ingredient of Comparative Example 7 was 12.0 parts of Pyroxylone and 87.5 parts of clay. Obtained.

[Comparative Examples 12 to 19] Prepared according to the preparation method of Example 1, except that the agricultural chemical active ingredients of Comparative Examples 1 to 8 were 4.0 parts of Cartap and the amount of clay was adjusted to be 100 parts in total. Then, a granular material for rice seedling box application was obtained.
[Comparative Examples 20 to 22] Prepared according to the preparation method of Example 1 except that the agrochemical active ingredients of Comparative Examples 9 to 11 were 2.0 parts of thiamethoxam and the amount of clay was adjusted to a total of 100 parts. Then, a granular material for rice seedling box application was obtained.
[Comparative Examples 23 to 37] The orthophosphoric acid of Example 1 was changed to formic acid, acetic acid, propionic acid, butyric acid, succinic acid, citric acid, malonic acid, succinic acid, maleic acid, fumaric acid, malic acid, tartaric acid, hydrochloric acid, nitric acid, Except that it was sulfuric acid, it was prepared according to the preparation method of Example 1 to obtain a rice seedling box applied granule.
[Comparative Examples 38 to 39] Except that the orthophosphoric acid of Example 18 was formic acid and citric acid, respectively, it was prepared in accordance with the preparation method of Example 1 to obtain rice seedling box application granules.
[Comparative Examples 40-41] Except that the orthophosphoric acid of Example 22 was formic acid and citric acid, respectively, it was prepared in accordance with the preparation method of Example 1 to obtain rice seedling box application granules.
[Comparative Examples 42 to 43] Except that the orthophosphoric acid of Example 37 was formic acid and citric acid, respectively, it was prepared in accordance with the preparation method of Example 1 to obtain rice seedling box application granules.

Next, the usefulness of the rice seedling box application granular material of this invention is shown by a test example.
[Rice damage test]
A seedling box was filled with 4 L of culture soil, seeded with 180 g of rice seed pod (variety: Koshihikari), and then 50 g of the prepared granular pesticide composition was applied. 20 days after sowing (corresponding to the time of transplantation to Honda), the growth of the seedlings and the extent of root elongation of rice seedlings were investigated. ) Evaluation was made according to the following evaluation standards based on the Japan Plant Protection Association).

[Evaluation criteria for phytotoxicity in the growth of above-ground rice seedlings]
3: Height equivalent to untreated section (90% or more compared to untreated section).
2: Slightly inferior to the growth of the untreated plot, but no problem (89-80% of the untreated plot).
1: Variation in growth is observed (79-50% of the untreated area).
0: A phytotoxicity causing a practical problem (49% or less of the untreated area)

[Evaluation criteria for phytotoxicity of rice seedling root elongation]
3: Growth equivalent to the untreated group (90% or more compared to the untreated group).
2: Slightly inferior to the growth of the untreated plot, but no problem (89-80% of the untreated plot).
1: Variation in growth is observed (79-50% of the untreated area).
0: A phytotoxicity causing a practical problem (49% or less of the untreated area)

The results are shown in Tables 1-5.
In the table, Invention No. test No. 1 to 40 are the same as those in Examples 1 to 40 except that the test No. 1 to 43 correspond to Comparative Examples 1 to 43.

Claims (2)

A rice seedling box applied granule comprising an agrochemical active ingredient, orthophosphoric acid having a content of 0.05 to 5% by weight , anhydrous sodium sulfate, and a solid carrier. 2. The rice seedling box application granule according to claim 1, wherein the weight ratio of the contents of orthophosphoric acid and anhydrous sodium sulfate in the rice seedling box application granule is 1: 0.3 to 1:10.