JP2001106601A - Suspension composition and spraying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new suspension composition, and further to provide a spraying method. SOLUTION: This suspension composition comprises a solid material having <1 specific gravity, a surfactant, a dispersion medium and an agrochemical active ingredient (with the proviso that the suspension composition for application on water surface in which the solid material having <1 specific gravity is a hollow organic powder and the dispersion medium is water is omitted). The method for spraying the suspension composition comprises directly spraying the suspension composition comprising the solid material having <1 specific gravity, the surfactant, the dispersion medium and the agrochemical active ingredient (with the proviso that the suspension composition for application on water surface in which the solid material having <1 specific gravity is the hollow organic powder and the dispersion medium is the water is omitted) on a flooded paddy field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a suspension composition for direct spraying of flooded submerged paddy fields, which has excellent diffusibility of an active ingredient of agricultural chemicals in water, and a spraying method.

[0002]

2. Description of the Related Art Conventionally, for spraying pesticides on paddy fields, granules, dusts, emulsions, wettable powders and the like have been used. However, dusts and wettable powders may affect the sprayer and the environment due to dusting, and even in the case of emulsions, there are problems in terms of toxicity and flammability of the organic solvent. Granules are a highly safe dosage form with less of these problems, but require a spray amount of 1 to 4 kilograms per 10 ares, and are particularly labor-intensive for sprayers when spraying over large paddy fields. Therefore, there is a demand for the development of a small amount of a spray for reducing the application rate of the preparation.

However, if the application rate of the granules is 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 directly spraying a suspension composition on a flooded sewage paddy (Japanese Patent Publication No. 7-47521) has been proposed.

[0005] A pesticidal active ingredient is suspended in water or a non-aqueous solvent. The specific gravity of the pesticidal active ingredient is usually 1 or more. Prone. In particular, when the concentration of the pesticidal active ingredient in the composition is high, the specific gravity becomes larger, and when the composition is sprayed on a flooded sewage paddy, the droplet itself tends to sink to the bottom of the water. Therefore, depending on the type of the pesticide active ingredient, the diffusion of the pesticide active ingredient into the soil becomes insufficient due to adsorption to the soil and the like, and when the pesticide active ingredient is sprayed from the ridge, the pesticide active ingredient becomes non-uniform. In some cases, phytotoxicity to paddy rice and insufficient effect in the central part of the paddy field were observed.

[0006] Japanese Patent Application Laid-Open No. 11-228303 discloses a water-insoluble or insoluble agricultural chemical active ingredient, a surfactant,
A water-applied suspended or milk-suspended agricultural chemical composition having improved spreadability and storage stability, characterized by adding a hollow organic powder to an agricultural chemical composition comprising water and, if necessary, an auxiliary agent. Have been.

[0007]

SUMMARY OF THE INVENTION Accordingly, the object of the present invention is to be able to labour-spray to flooded sewage fields,
It is an object of the present invention to provide a suspension composition and a spraying method in which a pesticidal active ingredient is rapidly diffused in paddy water and has no problem in terms of medicinal properties and phytotoxicity.

[0008]

Means for Solving the Problems The present invention provides the following [1] to

[9] A suspension composition and a spraying method according to [9].

[1] A suspension composition containing a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium and an agrochemical active ingredient (where the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersing medium is water Excluding the water-borne application suspension composition).

[2] A suspension composition for direct spraying in a flooded paddy field containing a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium, and an agricultural chemical active ingredient (where the solid substance having a specific gravity of less than 1 is a hollow organic powder) And a water-applied suspension composition in which the dispersion medium is water.)

[3] The suspension composition according to the above [1] or [2], wherein the solid substance having a specific gravity of less than 1 has an average particle size of less than 50 μm.

[4] The suspension composition according to any one of [1] to [3], wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body.

[5] The suspension composition according to any one of [1] to [4], wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.

[6] The suspension composition according to any one of [1] to [5], wherein the specific gravity of the suspension composition is less than 1.05.

[7] The suspension composition according to the above [1] to [5], wherein the specific gravity of the suspension composition is less than 1.

[8] A suspension composition containing a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium and an agricultural chemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersing medium is water Is applied directly to a flooded sewage paddy field.

[0017]

[9] The method of the above-mentioned [8], wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.

[0018]

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 as follows. By lowering the specific gravity of the suspension composition, when the suspension composition is directly sprayed on a flooded sewage paddy field, It is to make the suspension composition hard to sink. Further, even when the suspension composition once settles, the solid substance re-emerses with the pesticidal active ingredient distributed around the solid substance due to its buoyancy, thereby suppressing the sedimentation of the pesticidal active ingredient.
Further, when a surfactant is contained, the suspension composition is imparted with water surface spreadability by its surface tension lowering ability.
By these actions acting synergistically, the diffusivity of the suspension composition on the water surface and in water is significantly improved, and as a result,
It is possible to quickly and uniformly distribute the pesticidal active ingredient over a wide range.

The suspension composition of the present invention can be sprayed at any time before, during, or after transplanting rice, as long as the paddy field after flooding is flooded. It can also be applied to submerged direct sowing rice. It can also be sprayed when irrigation water enters. In addition, the suspension composition may be sprayed locally on the paddy field, and it is not necessary to uniformly spray the suspension composition 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.

The amount of application of the suspension composition of the present invention per unit area is not particularly limited, but the amount of application per 10 ares is preferably 1000 ml or less, more preferably 100 to 500 ml, from the viewpoint of labor saving of application. is there.

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, synthetic resin powders such as polyethylene powder and polypropylene powder, hollow inorganic powders such as hollow bodies composed of microsilas balloons and borosilicate glass, phenolic resins, epoxy resins, acrylic resins (for example, vinylidene chloride-
Acrylonitrile copolymer, styrene-acrylonitrile copolymer, etc.) and a hollow organic powder made of a synthetic resin such as a polystyrene resin. The solid substance may be any substance that reduces the specific gravity of the suspension composition 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.

When a liquid pesticidal active ingredient is used,
When the pesticidal active ingredient is used by dissolving it in an organic solvent, or when using a non-aqueous liquid as all or a part of the dispersion medium, the solid substance having a specific gravity of less than 1 is dissolved in these liquids, It is necessary to select from those that do not cause deterioration due to. Preferred are hollow inorganic powders.

Although the average particle size of the solid substance having a specific gravity of less than 1 is not particularly limited, it is usually less than 50 μm, preferably 0.01 μm, from the viewpoint of improving the stability of the suspension and the diffusibility of the suspension.
To 30 μm, more preferably 0.05 to 10 μm or less.

The specific gravity of the solid substance having a specific gravity of less than 1 can be used as long as it is less than 1, but it is preferable that the specific gravity is 0.8 or less, more preferably 0, in order to exhibit the effect with a smaller addition amount. .7 or less. If the specific gravity is too small, it is easy to separate in the suspension. Preferably the specific gravity is 0.1 or more, more preferably 0.2
Should be selected from more than five.

In view of the above, the specific gravity of the solid substance having a specific gravity of less than 1 is preferably 0.1 to 0.8, more preferably 0.25.
And a hollow inorganic powder such as a hollow body made of borosilicate glass, which has a specific gravity of 0.7 to 0.7.

In order for the suspension composition of the present invention to have sufficient diffusibility, the specific gravity of the suspension composition is preferably less than 1.05, more preferably 0.7 or more and less than 1. . The specific gravity of the suspension composition can be appropriately adjusted by increasing or decreasing the specific gravity of the solid substance having a specific gravity of less than 1 and the amount of the solid substance contained in the suspension composition. For example, if it is desired to lower the specific gravity of the suspension composition, a solid substance having a specific gravity of less than 1 may be used, or the amount of the solid substance having a specific gravity of less than 1 may be increased.

The pesticidal active ingredient that can be used in the pesticidal granules of the present invention is not particularly limited, but includes, 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).

As 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 the disinfectants include copper disinfectants such as inorganic copper agents, organochlorine disinfectants such as fthalide (generic name), and organic phosphorus disinfectants such as IBP (generic name) and EDDP (generic 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 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-based surfactant: Examples include acetylene glycol, acetylene alcohol, an ethylene oxide adduct of acetylene glycol, and an ethylene oxide adduct of acetylene alcohol.

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

(B) Anionic surfactant: (B-1) Carboxylic surfactant: For example, polyacrylic acid, polymethacrylic acid, polymaleic acid, maleic acid and olefins (eg, isobutylene and diisobutylene) With acrylic acid, itaconic acid, methacrylic acid and itaconic acid, maleic acid and styrene, acrylic acid and methacrylic acid, 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.

[0040] (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 type surfactants and amino acid type surfactants.

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

Examples of the dispersion medium used in the present invention include glycols, organic solvents such as vegetable oils and mineral oils, and water. Water is preferred.

Further, if necessary, as other auxiliary agents,
Organic solvents, freezing point depressants, anti-settling agents, defoamers, preservatives and the like can be used. Examples of the organic solvent include didodecyl phthalate, ditridecyl phthalate, phenylxylylethane, dodecylbenzene, and the like.Examples of the freezing point depressant include ethylene glycol, propylene glycol, and glycerin, and the like. Lanthanum, N-vinylacetamide polymer, microcrystalline cellulose, bentonite, colloidal hydrous aluminum magnesium silicate, and the like. Silicone compounds and the like are used as defoamers, and benzoic acid is used as a preservative. Examples thereof include sodium and 1,2-benzisothiazolin-3-one.

The method for producing the suspension composition of the present invention is not particularly limited, but is obtained by adding the above-mentioned components to a dispersion medium and mixing with a stirrer. If necessary, the pesticidal active ingredient, the solid substance having a specific gravity of less than 1, and the other adjuvants may be individually or mixed and finely pulverized by a dry or wet pulverizer.

The fine pulverization by dry pulverization is performed by an impact pulverizer,
It can be performed by a ball mill, a jet mill, or the like.
Fine pulverization by wet pulverization includes attritor (trade name), sand grinder (trade name), Dyno mill (trade name),
It can be performed by a sand mill such as a pearl mill (trade name), an Apex mill (trade name), a biscomil (trade name), and an ultra bisco mill (trade name).

The suspension composition of the present invention is produced by mixing a solid pesticide composition containing a solid substance having an average particle diameter of less than 50 μm and a specific gravity of less than 1, a surfactant and a pesticide active ingredient with an appropriate amount of water. You can also. The shape of the solid pesticide composition may be any of powder, granule, tablet and the like.

[0050]

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.

[0051]

[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 7] Halosulfuron methyl (generic name) was finely pulverized in advance with a jet-omizer (manufactured by Seishin Enterprise Co., Ltd.). Next, the pulverized product, the surfactant shown in Table 2, a solid substance having a specific gravity of less than 1, other adjuvants, and a dispersion medium were stirred and mixed to obtain a suspension composition of the present invention.

[Comparative Example 1] Halosulfuron-methyl was finely pulverized in advance with a jet-omizer (manufactured by Seishin Enterprise Co., Ltd.). Next, the pulverized material, the surfactants shown in Table 2, other adjuvants, and a dispersion medium were stirred and mixed to obtain a suspension composition.

[Comparative Examples 2 to 6] Halosulfuron-methyl was finely pulverized in advance with a Jet Omizer (manufactured by Seishin Enterprise Co., Ltd.). Next, the pulverized product, a surfactant shown in Table 2, a solid substance having a specific gravity of less than 1, other adjuvants, and a dispersion medium were stirred and mixed to obtain a suspension composition.

[0057]

[Table 2]

Table 3 shows the amount of the spray composition per 10 ares and 0.01 ares of these suspension compositions, and the specific gravity of the suspension compositions.

[0059]

[Table 3]

[Test Example 1] (Dispersion stability test) The suspension compositions produced in Examples and Comparative Examples
1) and placed in a 40 ° C constant temperature bath for 3 months and in a 54 ° C constant temperature bath for 3 months. Observe the upper layer of the suspension composition. The presence or absence of flotation 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, specific gravity 1
When the average particle diameter of the solid substance having a specific gravity of less than 50 μm and the specific gravity of 0.25 or more, the solid substance having a specific gravity of less than 1 was not separated by flotation, and the dispersion stability was excellent.

[0062]

[Table 4]

[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. At the position 5 cm from the end,
The suspension composition in the amount of the spray liquid per 1 are was sprayed dropwise using a pipette. 3 hours after the treatment, using a pipette,
2.5c depth at 1,2,3,4m from the treatment section and the edge
2 ml of water was collected from the position of m, and the concentration of the pesticidal active ingredient was analyzed by HPLC. The diffusivity is based on the theoretical concentration in water when the pesticidal active ingredient diffuses uniformly.
It is shown as a percentage (%) of the actual water concentration by analysis.

Table 5 shows the results. As shown in Table 5, the suspension composition of the present invention showed excellent diffusibility as compared with the comparative example.

[0065]

[Table 5]

Claims (9)

[Claims] 1. A suspension composition comprising a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium and an agrochemical active ingredient (where the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is water). Except for certain water applied suspension compositions). 2. A suspension composition for direct spraying in a flooded paddy field, comprising a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium and an agricultural chemical active ingredient (where the solid substance having a specific gravity of less than 1 is a hollow organic powder). And a water-applied suspension composition in which the dispersion medium is water.) 3. The solid substance having a specific gravity of less than 1 has an average particle size of 5
3. The suspension composition according to claim 1, which is less than 0 μm. 4. The suspension 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. 5. The suspension composition according to claim 1, wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder. 6. The suspension composition according to claim 1, wherein the specific gravity of the suspension composition is less than 1.05. 7. The suspension composition according to claim 1, wherein the specific gravity of the suspension composition is less than 1. 8. A suspension composition comprising a solid substance having a specific gravity of less than 1, a surfactant, a dispersing medium and an agrochemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is water). A suspension composition excluding a certain surface application suspension composition) is sprayed directly onto a flooded paddy field. 9. The method for spraying a suspension composition according to claim 8, wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.