JP2001106602A - Solid agrochemical composition and spraying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new solid agrochemical composition, and further to provide a spraying method. SOLUTION: This solid agrochemical composition comprises a solid material having <=10 μm average diameter and <1 specific gravity, a surfactant and an agrochemical active ingredient. The method for spraying the solid agrochemical composition comprises mixing the solid agrochemical composition comprising the solid material having <1 specific gravity, the surfactant and the agrochemical active ingredient, with water to prepare a suspension, and directly spraying the obtained suspension on a flooded paddy field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solid pesticidal composition for flooded sewage paddy fields, which has excellent diffusibility on the water surface and in water, and a method for spraying the active ingredient.

[0002]

2. Description of the Related Art Conventionally, pesticide application to paddy fields has been
Granules, powders, emulsions, wettable powders and the like are used. However, dusts and wettable powders may adversely affect the sprayer and the environment due to dusting, and emulsions have problems in terms of toxicity and flammability of organic solvents. Granules are a dosage form having less of these problems and a high safety, but are 1 to 4 per 10 ares.
The application amount of kilogram is required, and especially when spraying over a large area of paddy fields, the burden on the sprayer is labor intensive. .

[0003] However, if the application rate of the granules is to be reduced, the concentration of the pesticidal active ingredient in the granules necessarily increases, and the number of granules per unit area decreases. As a result, it is difficult to disperse or to disperse or diffuse the pesticidal active ingredient from the granule into the paddy water sufficiently and uniformly, which tends to reduce the effect and cause harm to rice.

[0004] In view of the above, in recent years, a method of spraying an aqueous suspension formulation directly on a flooded sewage paddy (Japanese Patent Publication No. 7-47521) or a method of preparing a diluent by adding a small amount of water to a solid agricultural chemical formulation. A method of directly spraying the prepared solution at a rate of 1000 ml or less per 10 ares on a flooded paddy field (Japanese Patent Laid-Open No. 5-1).
No. 17104) has been proposed.

[0005] However, since the aqueous suspension preparation is a viscous liquid, a small amount of the flowable agent adheres to and remains on the inner wall of the container after spraying, so that disposal of the container has become an environmental problem.

A solid pesticide composition containing a solid substance having a specific gravity of less than 1, a surfactant and a pesticidally active ingredient is disclosed in JP-A-7-23.
3002, JP-A-10-81603, JP-A-10-245303, JP-A-10-28750
5 and JP-A-11-228304. However, there is no description about a method of spraying, in which the suspension is prepared by mixing the solid pesticide composition with water, and then the suspension is directly sprayed on a flooded paddy field. Further, there is no description about a solid pesticide composition containing a solid substance having an average particle diameter of 10 μm or less and a specific gravity of less than 1.

[0007]

Means for Solving the Problems The present invention provides the following [1] to
[11] The present invention relates to the solid pesticidal composition and the spraying method according to [11].

[1] A solid pesticidal composition comprising a solid substance having an average particle diameter of 10 μm or less and a specific gravity of less than 1, a surfactant, and an agricultural chemical active ingredient.

[2] The solid agricultural chemical composition according to the above [1], wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body.

[3] A suspension is prepared by mixing a solid pesticide composition containing a solid substance having a specific gravity of less than 1 and a surfactant and an agrochemical active ingredient with water to prepare a suspension. A method for spraying a solid pesticide composition, which is sprayed.

[4] Suspension is added at a rate of 100 per 10 ares.
The spraying method according to the above [3], wherein the spraying is performed directly at a rate of 0 ml or less on the flooded sewage paddy field.

[5] The spraying method according to the above [3] or [4], wherein the average particle diameter of the solid substance having a specific gravity of less than 1 is less than 50 μm.

[6] The spraying method according to the above [3] to [5], wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body.

[7] The spraying method according to the above [3] to [6], wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.

[8] The spraying method according to the above [3] to [7], wherein the suspension contains microcrystalline cellulose.

[0016]

[9] The spraying method according to the above [3] to [8], wherein the specific gravity of the suspension is less than 1.05.

[10] The spraying method according to the above [3] to [8], wherein the specific gravity of the suspension is less than 1.

[11] A solid agricultural chemical composition comprising a solid substance having a specific gravity of less than 1, a surfactant and an agricultural chemical active ingredient, the composition being mixed with water to prepare a suspension, and then the suspension is prepared. A solid pesticidal composition, which is sprayed directly onto a flooded sewage field.

In the present invention, a conventional method of directly spraying a flowable agent onto a flooded paddy field, a method of adding a small amount of water to a solid preparation to prepare a diluent, and preparing the diluent at a rate of 100 per 10 ares.
Compared to the method of spraying directly to the submerged paddy field at a rate of 0 ml or less, the pesticidal active ingredient diffuses quickly and uniformly into water after spraying, so that the medicinal effect is good over the entire paddy field and the rice at the spraying point is good. No phytotoxicity was observed. Further, in the present invention, since the solid pesticide composition hardly remains in the empty container after spraying, there is little environmental problem with respect to disposal of the container.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The action of the solid substance having a specific gravity of less than 1 used in the present invention is to reduce the specific gravity of the suspension so that the suspension in which the pesticidal active ingredient is suspended is directly transferred to a flooded paddy field. This is to make the suspension hard to sink when sprayed. Further, even when the suspension once settles, the solid substance re-emerses with the pesticide active ingredient distributed around the solid substance due to its buoyancy, thereby suppressing the sedimentation of the pesticide active ingredient. Further, when the surfactant is contained, the suspension is given a water surface spreading property by its surface tension lowering ability. These actions work synergistically to significantly improve the diffusivity of the suspension on the water surface and in water,
It is possible to quickly and uniformly distribute the pesticidal active ingredient over a wide range.

The suspension prepared by mixing the solid pesticide composition of the present invention with water is prepared by slightly mixing the solid pesticide composition with paddy water, agricultural water, tap water and the like in a container of an appropriate size. Can be easily prepared.

The suspension prepared by mixing the solid pesticidal composition of the present invention with water can be prepared before, during, or after transplanting the rice if the paddy field after flooding is flooded. It can be sprayed at any time. It can also be applied to submerged direct sowing rice. It can also be sprayed when irrigation water enters. In addition, the suspension may be sprayed locally on the paddy field, and it is not necessary to uniformly spray the suspension over the entire paddy field as in the case of granules. Spraying may be carried out by hand shaking in a plastic container or by spraying or spraying using a pressurized sprayer. Furthermore, it is suitable for spraying using a RC (radio control) helicopter that has been widely used in recent years. Alternatively, the water may be dropped and sprayed on the inflow water at the water port of the paddy field, and may be poured into the paddy field together with the inflow water.

In the present invention, the amount of water used in preparing a suspension by mixing the solid pesticide composition with water is appropriately adjusted according to the amount of the suspension to be sprayed per unit area. Good.

The amount of suspension per unit area of the suspension prepared by mixing the solid pesticidal composition of the present invention and water is not particularly limited. However, the amount of application per 10 ares is 1000 ml or less from the viewpoint of labor saving. And more preferably 10
It is 0 to 500 ml.

The amount of the solid pesticidal composition of the present invention to be used per 10 ares is usually 1 to 10 from the viewpoint of easy preparation of the suspension.
500 g, preferably 1-150 g.

Examples of the solid substance having a specific gravity of less than 1 used in the present invention include a resin powder, an inorganic or organic hollow body or a hollow porous body (a substance having a large number of bubbles in particles), and the like. More specifically, for example, a synthetic resin powder such as polyethylene powder and polypropylene powder, a hollow inorganic powder such as a hollow body made of micro shirasu balloon and borosilicate glass, a phenol resin,
Examples include hollow organic powders made of synthetic resins such as epoxy resins, acrylic resins (for example, vinylidene chloride-acrylonitrile copolymer, styrene-acrylonitrile copolymer, etc.) and polystyrene resins. The solid substance may be any substance that can lower the specific gravity of the suspension with a specific gravity of less than 1, but a hollow body or a hollow porous body having a sufficient specific gravity lowering action even with a small amount of addition is preferable.

The average particle size of the solid substance having a specific gravity of less than 1 is not particularly limited, but is usually less than 50 μm, preferably 0.04 μm, from the viewpoint of preventing the solid substance from floating and separating in a suspension.
It is 1 to 30 μm, more preferably 0.05 to 10 μm.

The specific gravity of the solid substance having a specific gravity of less than 1 is preferably 0.8 or less, more preferably 0.7 or less, so that the effect can be exhibited with a smaller amount of addition. In order to prevent the floating of the solid substance in the suspension, the specific gravity is preferably 0.1 or more, and more preferably 0.1 or more.
A thing of 25 or more is desirable. Therefore, the specific gravity of the solid substance having a specific gravity of less than 1 is preferably from 0.1 to 0.8, more preferably from 0.25 to 0.7, and the hollow material composed of a micro shirasu balloon and borosilicate glass having these specific gravities is preferable. And hollow inorganic powder such as a body.

In order for a suspension prepared by mixing the solid pesticidal composition of the present invention and water to have sufficient diffusivity, the specific gravity of the suspension is preferably less than 1.05, It is more preferable that the value be 7 or more and less than 1. The specific gravity of the suspension can be appropriately adjusted by increasing or decreasing the specific gravity of a solid substance having a specific gravity of less than 1 and the amount of the solid substance contained in the solid pesticidal composition. For example, if it is desired to reduce the specific gravity of the suspension, a solid substance having a specific gravity of less than 1 may be used or a compounding amount of the solid substance having a specific gravity of less than 1 may be increased.

The pesticidal active ingredients that can be used in the present invention are not particularly limited, but include, for example, the following, and one or more of these may be used in combination.

Examples of herbicides include pyrazosulfuron ethyl (pyrazosulfuron ethyl / general name), halosulfuron methyl (halosulfuron methyl / generic name), bensulfuron methyl (bensulfuron methyl / generic name), imazosulfuron (imazosulfuron / generic name), Azimsulfuron (azimsulfuron / generic name), cinosulfuron (cinosu
lfuron / generic name), cyclosulfa
muron / generic name) and ethoxysulfuron
furon (generic name), sulfonylurea herbicides, esprocarb (generic name), benthiocarb (ben)
Carbamate herbicides such as thiocarb / generic name, molinate / generic name, dimepiperate / generic name and pyributicarb / pyributicarb / generic name, mefenacet (mefenacet / generic name), butachlor (butachlor / generic name) ), Pretilachlor (pretilachlor / generic name), tenylchlor (thenylchlor / generic name), bromobutide
Acid amide herbicides, such as ethobenzanide (generic name) and etobenzanid (generic name); urea herbicides, such as dimron (dymron / generic name) and cumyluron (cumyluron / generic name); bentazone (bentazone / generic name) And diazine herbicides such as bentazone, 2,4-D
(Generic name), 2,4-D salt, 2,4-D ester,
MCP (generic name), salt of MCP, ester of MCP, M
Phenoxy acid herbicides such as CPB (generic name), MCPB salt, MCPB ester, phenothiol (MCPA-thioethyl / generic name), clomeprop (clomeprop / generic name) and naproanilide (naproanilide / generic name), oxadiazon ( oxadiazon / generic name, pyrazolate (pyrazolate / generic name), pyrazoxifene (pyra
zoxyfen / generic name), benzofenap /
Diazole herbicides such as oxadiargyl (generic name) and oxadiargyl (generic name);
triazine herbicides such as thametryn / generic name and simetryn / generic name, piperophos
os / general name), anilofos (anilofos / generic name), butamifos (butamifos / generic name) and benzulide (bensu)
lide / generic name) and dithiopyr (di)
thiopyr (common name) and pyriminobac-methyl (pyrim
aromatic carboxylic acid herbicides such as inobac methyl (generic name), CNP (generic name), chloromethoxynil (chlormetho)
xynil / generic name), cyhalofop butyl (cyhalofop but
diphenyl ether herbicides such as yl / generic name and bifenox / bifenox, cafenstrole / generic name, pentoxazone / pentoxazone / generic name, indanofan
/ Generic name), oxadiclomefone (generic name), fentrazamide (fentrazamide / generic name),
Other herbicides such as butenachlor (butenachlor / generic name), ACN (generic name), benzobicyclon (benzobicyclon / test name), benfresate (benfuresate / generic name) and cymmethylin (cimmethylin / generic name).

In the insecticide, for example, MPP (common name),
MEP (generic name), pirimiphos methyl
hyl / common name), diazinon (diazinon / common name),
Pyridafenthion (pyridaphenthion / generic name), chlorpyrifos methyl (chlorpyrifos methyl / generic name), vamidothion (vamidothion / generic name), marathon (malathion / generic name), PAP (generic name), dimethoate (dimethoate / generic name), ethylthiomethone ( di
sulfoton / generic name), PMP (generic name), monocrotophos (generic name), BRP (generic name), C
VMP (generic name), dimethylvinpho
s / general name), propaphos (propaphos / generic name), DE
Organophosphorus pesticides such as P (generic name) and EPN (generic name), NAC (generic name), MTMC (generic name), MIP
C (generic name), BPMC (generic name), PHC (generic name), XMC (generic name), methomil (methomyl / generic name), thiodicarb (thiodicarb / generic name), bendiocarb (bendiocarb / generic name), Carbosulfan (common name) and benfracalp (benfu
carbamate insecticides such as racarb / generic name; nereistoxin insecticides such as cartap / generic name, thiocyclam / bensultap / generic name; buprofezin
ezin / generic name) and tebufenozide /
Insect growth regulators such as ethofenprox (generic name) and cycloprothrin (cyc
pyrethroid insecticides such as loprothrin / generic name and other insecticides such as fipronil / generic name and imidacloprid.

Examples of disinfectants include copper disinfectants such as inorganic copper agents, organochlorinated disinfectants such as fthalide (common name), and organic phosphorus disinfectants such as IBP (common name) and EDDP (common name). , Fungicides such as dicarboximides such as iprodione (generic name), mepronil (meprnil)
onil / generic name, flutolanil (flutolanil / generic name), teclophthalam (tecloftalam / generic name), penciclone (pencycuron / generic name), metalaxyl (meta
acid amide fungicides such as laxyl / generic name, thifluzamide / thifluzamide / dicrocymet / generic name, furametpyr / furametpyr / carpropamide / carpropamide / generic name, blasticidin S ( blasticidin S / generic name, kasugamycin / generic name, polyoxin (polyo
antibiotics such as xins / generic name, validamycin A / generic name and spinosad (generic name), azoxystrobin (azoxystrobin / generic name), kresoxim methyl (common name) and metominostrobin Methoxyacrylate fungicides such as (metominostrobin / generic name), acetamidoprid (ac
etamiprid / common name) and clothianidin (chlothian)
Nitromethylene fungicides such as idine / generic name), organic arsenicals, diclomezine / diclomezine,
Ferimzone (ferimzone / generic name), probenazole (probenazole / generic name), isoprothiolane (isoprot
hiolane / generic name), tricyclazole
/ Generic name), pyroquilon (pyroquilon / generic name), iminoctadine acetate (guazatine / generic name), chlorfenapyr (chlorfenapyr / generic name), mepanipyrim (mepa
nipyrim / generic name), oxolinic acid
/ Generic name) and acibenzolar-S-methyl (aciben
Other fungicides such as zolar-S-methyl / generic name).

Examples of plant growth regulators include, for example, uniconazole (uniconazole / common name) and inabenfide (i
nabenfide / common name) and the like.

The surfactant used in the present invention includes:
The following (A), (B), (C), (D) and (E) are mentioned, and one or more of these can be used in combination.

(A) Nonionic surfactant: (A-1) Polyethylene glycol type surfactant: for example
For example, polyoxyethylene alkyl (C_12-18) Athe
Ethylene oxide adduct of alkyl naphthol,
Polyoxyethylene (mono or di) alkyl (C
_8-12) Phenyl ether, polyoxyethylene (mono
Or di) alkyl (C_8-12) Phenyl ether
Rumarin condensate, polyoxyethylene (mono, di or
Tri) phenylphenyl ether, polyoxyethylene
(Mono, di or tri) benzyl phenyl ether,
Lioxypropylene (mono, di or tri) benzyl
Phenyl ether, polyoxyethylene (mono, di or
Tri) styryl phenyl ether, polyoxypropyl
(Mono, di or tri) styryl phenyl ether,
Polyoxyethylene (mono, di or tri) styrylf
Phenyl ether polymer, polyoxyethylene polio
Xypropylene block polymer, alkyl
(C_12-18) Polyoxyethylene polyoxypropylene
Block polymer ether, alkyl (C_8-12) Fe
Nyl polyoxyethylene polyoxypropylene block
Polymer ether, polyoxyethylene bisphenyl ether
-Tel, polyoxyethylene resin acid ester, polyoxy
Cyethylene fatty acid (C _12-18) Monoester, polyoxy
Cyethylene fatty acid (C_12-18) Diester, polyoxy
Ethylene sorbitan fatty acid (C_12-18) Ester, guri
Serol fatty acid ester ethylene oxide adduct,
Castor oil ethylene oxide adduct, hydrogenated castor oil ethyl
Oxide adduct, alkyl (C_12-18) Amine ethyl
Lenoxide adducts and fatty acids (C_12-18) Amide
Examples include ethylene oxide adducts.

(A-2) Polyhydric alcohol type surfactant: for example, glycerol fatty acid ester, polyglycerin fatty acid ester, pentaerythritol fatty acid ester,
Sorbitol fatty acid ( _C12-18 ) ester, sorbitan fatty acid ( _C12-18 ) ester, sucrose fatty acid ester,
Examples include polyhydric alcohol alkyl ethers and fatty acid alkanolamides.

(A-3) Acetylene surfactant: Examples include acetylene glycol, acetylene alcohol, ethylene oxide adduct of acetylene glycol, and ethylene oxide adduct of acetylene alcohol.

(A-4) Other surfactants: Examples include alkyl glycosides.

(B) Anionic surfactant: (B-1) Carboxylic acid type surfactant: for example, polyacrylic acid, polymethacrylic acid, polymaleic acid, maleic acid and olefin (for example, isobutylene and diisobutylene) And acrylic acid and itaconic acid copolymers, methacrylic acid and itaconic acid copolymers, maleic acid and styrene copolymers, acrylic acid and methacrylic acid copolymers, and acrylic acid A copolymer with acrylic acid methyl ester, a copolymer with acrylic acid and vinyl acetate,
Copolymers of acrylic acid and maleic acid, carboxylic acids such as N-methyl-fatty acid ( _C12-18 ) sarcosinate, resin acids and fatty acids ( _C12-18 ), and salts of these carboxylic acids.

(B-2) Sulfate ester type surfactant: For example
If the alkyl (C_12-18) Sulfuric ester, polyoxye
Tylene alkyl (C _12-18) Ether sulfate,
Lioxyethylene (mono or di) alkyl
(C_8-12) Phenyl ether sulfate, polyoxy
Cyethylene (mono or di) alkyl (C_8-12) Fe
Sulfuric esters of polymers of nyl ethers, polyoxyethylene
Tylene (mono, di or tri) phenylphenyl ether
Sulphate, polyoxyethylene (mono, di or
Tri) benzyl phenyl ether sulfate, polio
Xyethylene (mono, di or tri) styrylphenyl
Ether sulfate, polyoxyethylene (mono, di
Or tri) styryl phenyl ether
Acid ester, polyoxyethylene polyoxypropylene
Sulfuric ester of block polymer, sulfated oil, sulfated fat
Fatty acid esters, sulfated fatty acids, sulfated olefins, etc.
And sulfate salts thereof.
Can be

(B-3) Sulfonic acid type surfactant: For example, paraffin (C _12-22 ) sulfonic acid, alkyl (C
_8-12 ) Benzenesulfonic acid, alkyl ( _C8-12 ) formalin condensate of benzenesulfonic acid, cresolsulfonic acid formalin condensate, α-olefin ( _C14-16 )
Sulfonic acid, dialkyl ( _C8-12 ) sulfosuccinic acid,
Lignin sulfonic acid, polyoxyethylene (mono or di) alkyl ( _C8-12 ) phenyl ether sulfonic acid, polyoxyethylene alkyl ( _C12-18 ) ether sulfosuccinic acid half ester, naphthalene sulfonic acid, (mono or di) alkyl ( _C1-6 ) naphthalenesulfonic acid, formalin condensate of naphthalenesulfonic acid,
(Mono or di) alkyl (C _{1 to 6)} formalin condensates of naphthalenesulfonic acid formalin condensate of creosote oil sulfonic acid, alkyl (C _{8 to 12)} ether disulfonic acid, Igepon T (trade name), polystyrenesulfonic Sulfonic acids such as acids and copolymers of styrenesulfonic acid and methacrylic acid, and salts of these sulfonic acids.

[0043] (B-4) phosphoric acid ester type surfactants: For example, alkyl (C _{8 to 12)} phosphoric acid esters, polyoxyethylene alkyl (C _{1 2 to 18)} ether phosphate esters, polyoxyethylene (mono or di) Alkyl ( _C8-12 ) phenyl ether phosphate, polyoxyethylene (mono, di or tri) alkyl ( _C8-12 ) phenyl ether polymer phosphate, polyoxyethylene (mono, di or tri) phenyl phenyl ether Phosphate, polyoxyethylene (mono, di or tri) benzyl phenyl ether Phosphate, polyoxyethylene (mono, di or tri)
Styryl phenyl ether phosphate, polyoxyethylene (mono, di or tri) styryl phenyl ether polymer phosphate, polyoxyethylene polyoxypropylene block polymer phosphate, phosphatidylcholine, phosphatidylethanolimine and condensed phosphoric acid (eg, tripolyphosphoric acid, etc.) ), And salts of the phosphoric esters.

The salts in the above (B-1) to (B-4) include alkali metals (such as lithium, sodium and potassium), alkaline earth metals (such as calcium and magnesium), ammonium and various amines (such as alkyl). Amines, cycloalkylamines and alkanolamines).

(C) Cationic surfactants: Examples include alkylamine salts and alkyl quaternary ammonium salts.

(D) Amphoteric surfactants: Examples include betaine surfactants and amino acid surfactants.

(E) Other surfactants: Examples include silicone surfactants and fluorine surfactants.

The solid pesticidal composition of the present invention may further contain a thickener as a dispersion stabilizer. By adding a thickener, the average particle diameter of the solid substance having a specific gravity of less than 1 is 50.
Even in the case of having a thickness of not less than μm, separation of a solid substance having a specific gravity of less than 1 in a suspension can be suppressed. The thickener must be one that does not reduce the dispersion rate of the solid pesticidal composition in water, and preferred is microcrystalline cellulose.

If necessary, a water-insoluble powder or a water-soluble powder can be used as an extender. Mineral powders such as diatomaceous earth, talc, clay, bentonite, and calcium carbonate are used as the water-insoluble powder.
Water-soluble powders include lactose, fructose, sucrose, glucose,
Sugars such as dextrin and starch, urea, and alkali metal salts or ammonium salts such as sulfuric acid, phosphoric acid, hydrochloric acid, formic acid, acetic acid and propionic acid are used. These extenders may be used alone or as a mixture of two or more.

[0050] If necessary, an absorbent fine powder, a binder, a grinding aid, a decomposition inhibitor, a coloring agent and an antifoaming agent can be added as other auxiliary agents. As the binder, starch, starch derivatives, gum arabic, xanthan gum, sodium alginate, sodium polyacrylate, polyethylene glycol, polyvinyl alcohol,
Water-soluble or water-swellable polymers such as polyvinylpyrrolidone, microcrystalline cellulose and carboxymethyl cellulose.

The shape of the solid pesticidal composition of the present invention is not particularly limited, and may be, for example, any of powder, granule, powder and granule, and tablet.

The method for producing the solid pesticidal composition of the present invention can be produced, for example, by the following method, but is not particularly limited thereto.

In the case of a powdery composition, the required amount of the pesticidal active ingredient, a solid substance having a specific gravity of less than 1, a surfactant, and, if necessary, a bulking agent and other auxiliary agents are added and uniformly mixed. Finely pulverized to obtain a powdery composition. For fine pulverization, a dry pulverizer such as an impact pulverizer, a ball mill or a jet mill can be used. Alternatively, after finely pulverizing the pesticidal active ingredient in advance, the finely pulverized product, a solid substance having a specific gravity of less than 1, a surfactant, and, if necessary, a bulking agent and other adjuvants are uniformly mixed to obtain a powder. A composition is obtained.

In the case of a granular composition, the above-mentioned powdery composition is subjected to a granulation such as an extrusion granulator, a press granulator, a fluidized bed granulator, a stirring granulator or a tumbling granulator. The granulated composition is obtained by granulation. For example, in the case of extrusion granulation, an appropriate amount of water is added to the above powdery preparation, kneaded, then granulated using a granulator and dried to obtain a granular composition.

[0055]

Next, the present invention will be described more specifically with reference to examples. The meanings of the abbreviations used in Table 2 below are shown in Table 1.

[0056]

[Table 1]

The average particle size of the solid substance having a specific gravity of less than 1 shown in Table 1 is a value measured by the following method. 1 g of a solid substance having a specific gravity of less than 1 is added to 100 ml of a 1% aqueous solution of POE alkylaryl ether, and the mixture is stirred for 30 minutes while applying ultrasonic waves to disperse the particles. The dispersion was promptly measured with a Coulter LS130 type laser particle size analyzer (manufactured by Beckman Coulter, Inc.), and the volume median diameter of the particles was determined and defined as the average particle diameter.

The specific gravity of a solid substance having a specific gravity of less than 1 was measured by a pycnometer method (JIS-Z8807).

Examples 1 to 14 The pesticidal active ingredients, surfactants and extenders shown in Table 2 were mixed and pulverized with a single track mill (Seishin Co., Ltd.). Next, a solid substance having a specific gravity of less than 1 shown in Table 2 was mixed with the pulverized product.
Further, a predetermined amount of granulation water was added, the mixture was kneaded with a universal mixer (Dalton Co., Ltd.), and granulated with a basket-luser (BR-200, manufactured by Fuji Paudal) equipped with a 0.5 m / m screen. Then, it dried at 50 degreeC for 2 hours, and obtained the granular solid agricultural chemical composition of this invention.

[Comparative Examples 1 and 2] The pesticidal active ingredients, surfactants and extenders shown in Table 2 were mixed and pulverized with a single track mill (Seishin Co., Ltd.). Further, a predetermined amount of granulation water was added, the mixture was kneaded with a universal mixer (Dalton Co., Ltd.), and granulated with a basket-luser (BR-200, manufactured by Fuji Paudal) equipped with a 0.5 m / m screen. Then, it dried at 50 degreeC for 2 hours, and obtained the granular solid pesticide composition.

[0061]

[Table 2]

[0062]

[Table 3]

The amount of the solid pesticidal composition used per 10 ares, the amount of the suspension prepared by mixing the solid pesticidal composition with water, 0.01, 0.4 and 10 l are And the specific gravity of the suspension are shown in Table 3.

[0064]

[Table 4]

Test Example 1 (Dispersion Stability Test of Suspension) Each of the solid pesticide compositions produced in Examples and Comparative Examples was used in an amount of 500 m each in 10 ares as shown in Table 3.
1 of a graduated measuring cylinder with a stopper, pour hard water at 20 ° C. so as to obtain a spraying liquid amount per 10 ares as shown in Table 3, and invert the measuring cylinder at a pace of one inversion every 2 seconds.
Invert twice to prepare a suspension. After standing still in a constant temperature water bath at 20 ° C., the upper layer of the suspension was observed 30 minutes later, and the presence or absence of floating separation of a solid substance having a specific gravity of less than 1 was evaluated.

Table 4 shows the results. As shown in Table 4, when a solid substance having an average particle diameter of less than 50 μm and a specific gravity of less than 1 was used, the dispersion stability of the suspension was excellent (Example 1-13). Even when a solid substance having an average particle diameter of 50 μm or more and a specific gravity of less than 1 was used, the dispersion stability of the suspension was good when the thickener was used (Example 1).
4).

[0067]

[Table 5]

[Test Example 2] (Diffusion test) In a 25 cm wide, 4 m long, 15 cm high test container made of vinyl chloride (bottom area: 0.01 are), water was placed at a depth of 5 cm. The suspension was withdrawn from the middle part of the suspension prepared according to Test Example 1 at a position 5 cm from the end, and a suspension having a spraying liquid amount per 0.01 are shown in Table 3 using a pipette. And sprayed. Three hours after the treatment, using a pipette, 2 ml of water was collected from each of the treated part and the 1, 2, 3, and 4 m points at a water depth of 2.5 cm, and the concentration of the pesticide active ingredient in water was analyzed by HPLC. The diffusivity is the percentage (%) of the actual water concentration by HPLC analysis with respect to the theoretical water concentration when the pesticidal active ingredient is uniformly diffused.
Indicated by

Table 5 shows the results. As shown in Table 5, the suspension prepared by mixing the solid pesticide formulation containing no solid substance having a specific gravity of less than 1 with water in Comparative Example did not have sufficient diffusibility. However, the suspension prepared by mixing the solid pesticide composition of the present invention containing a solid substance having a specific gravity of less than 1 with water was excellent in diffusivity.

[0070]

[Table 6]

Test Example 3 (Water Disintegration Test) A 100 ml graduated cylinder equipped with a stopper and containing 100 ml of 3rd degree hard water was placed in a thermostatic water bath, and the water temperature was adjusted to 25 ° C.
10 g of the solid pesticidal compositions of Examples and Comparative Examples were placed in the cylinder, stoppered, and the cylinder was repeatedly inverted once every two seconds. The number of inversions until the grains were completely disintegrated was defined as disintegration in water.

The solid pesticidal composition of the present invention containing a solid substance having a specific gravity of less than 1 showed good disintegration in water.

[0073]

[Table 7]

[Test Example 4] (Herbicidal effect and phytotoxicity test) Rice seedlings were transplanted in a paddy field (bottom area: 0.4 are) divided into 2 m wide and 20 m long, and seeds of Nobie were further placed in the compartment. The seeds were sown and immersed in water to a depth of 5 cm. Transplant 15
One day later, a suspension having a spraying liquid amount per 0.4 are shown in Table 3 was sprayed dropwise at a position 50 cm from the end of the compartment. Four weeks after the chemical treatment, the herbicidal effect and the phytotoxicity on the rice were examined at each distance in the vertical direction from the treated part and the edge, and the herbicidal effect and the phytotoxicity were determined from the observation evaluation according to the following criteria.

(Judgment Criteria) 5: Complete Withdrawal or Suppression of 90% or More 4: Suppression of 70 to 90% 3: Suppression of 40 to 70% 2: Suppression of 20 to 40% 1: Suppression of 5 to 20% 0 : Suppression of 5 or less Tables 7 and 8 show the results. As shown in Tables 7 and 8, the solid containing a solid substance having a specific gravity of less than 1 according to the present invention is compared with a suspension prepared by mixing a solid pesticide formulation containing no solid substance having a specific gravity of less than 1 with water in Comparative Example. The suspension prepared by mixing the pesticide composition with water had an excellent herbicidal effect and did not show any phytotoxicity to paddy rice.

[0076]

[Table 8]

[0077]

[Table 9]

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B121 AA12 AA19 AA20 CB02 CB37 CC02 CC03 CC28 CC32 EA26 FA01 FA15 4H011 AA01 AB02 BA01 BB08 BB14 BC03 BC06 BC19 BC20 DC06 DD02 DH02 DH03 DH18 DH19

Claims (11)

[Claims] 1. A specific gravity 1 having an average particle diameter of 10 μm or less.
A solid pesticidal composition comprising less than a solid substance, a surfactant and a pesticidal active ingredient. 2. The solid agricultural chemical composition according to claim 1, wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body. 3. A suspension is prepared by mixing a solid pesticide composition containing a solid substance having a specific gravity of less than 1 and a surfactant and an agrochemical active ingredient with water to prepare a suspension, and then the suspension is directly sprayed on a flooded paddy field. Spraying a solid pesticide composition. 4. The spraying method according to claim 3, wherein the suspension is directly sprayed on a flooded sewer at a rate of 1000 ml or less per 10 ares. 5. The solid substance having a specific gravity of less than 1 has an average particle diameter of 5
5. The spraying method according to claim 3, which is less than 0 [mu] m. 6. The spraying method according to claim 3, wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body. 7. The spraying method according to claim 3, wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder. 8. The spraying method according to claim 3, wherein the suspension contains microcrystalline cellulose. 9. The method according to claim 3, wherein the specific gravity of the suspension is less than 1.05. 10. The suspension according to claim 3, wherein the specific gravity of the suspension is less than 1.
9. The spraying method according to any one of items 8 to 8. 11. A solid pesticidal composition comprising a solid substance having a specific gravity of less than 1, a surfactant and a pesticidally active ingredient, wherein the composition is mixed with water to prepare a suspension, and then the suspension is prepared. A solid pesticide composition which is sprayed directly on flooded sewage fields.