JP2002128602A - Agrochemical composition for paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an agrochemical composition that supports agrochemically active components in high concentrations, can uniformly move on the water surface of, for example, paddy field, without sinking down to the soil surface, after the composition is scattered on the paddy field surface and causes no problem of winds blowing the dispersed composition together in heaps, thus can rapidly disperse the agrochemically active components or can retain the slow-active components in dispersion in the paddy field. SOLUTION: The objective agrochemical composition characteristically comprises agrochemically active components and a crushed or granulated plant body of kenaf (Hibiscus cannabinus Linn. Hibiscus Sabdariffa Linn.).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an agricultural chemical composition for paddy fields, and more particularly, to a genus genus (Hibiscus cannabinus Linn./Hibiscus Sabdariffa Li.
The present invention relates to an agricultural chemical composition for a paddy field, wherein the agricultural chemical formulation can be suspended in water by using a crushed or crushed product of nn).

[0002]

2. Description of the Related Art At present, pesticide preparations in paddy fields include granules,
Powders, emulsions, wettable powders, floor pulls, granular wettable powders and the like are known. However, dusts and wettable powders are concerned about the influence on dusters and the environment due to dusting due to the formulation, and emulsions are concerned with the flammability and toxicity of the organic solvent contained therein. Furthermore, when the flowable agent is sprayed directly from the container, there is a possibility that the chemical solution may be applied to the sprayer, and the safety is similarly concerned. Even in the case of granules having relatively few problems, spraying of 1 to 4 kilograms per 10 ares is performed, and when spraying over a large area of water surface by a land improvement project or the like, it is large for sprayers. It is a labor burden.

[0003] Therefore, in order to reduce the application rate of granules,
There is a need for the development of small amounts of spray granules. However,
The reduction in the amount of granules increases the content of the pesticide active ingredient and reduces the number of granules per unit area, which causes uneven distribution, and allows the pesticide active ingredient from the granule to be sufficiently uniform in paddy water It is difficult to elute and diffuse into the water. As a result, the effect is reduced and phytotoxicity to rice is caused. Further, the sprayed granules settle on the soil surface and disperse the pesticidal active ingredient, so that there is a concern about an increase in the residual concentration in the soil.

[0004] On the other hand, attempts have been made to avoid the above-mentioned problem by making the granules have floating on the water surface. That is,
A technology has been developed in which a floating granule carrying a pesticide component on a floating granule nucleus is poured into the water surface of a paddy field or the like, and the injected granule floats on the water surface to evenly disperse the pesticide component. ,
This reduces the effort for even distribution. As the floating nuclei used in this technology, water-surface floating nuclei using inorganic or high-molecular polymers have been widely used. Further, as an example of a floating particle nucleus using an organic substance, for example, Japanese Patent Application Laid-Open No. 10-316505 discloses
A water-floating particulate carrier for agriculture in which a mixture of a binder and a specific gravity adjusting material is granulated into a porous granule as an organic material is described, and wood flour is used as an organic material having a water-floating property. In addition, Japanese Patent Publication No. 2-56323 and Japanese Patent Application Laid-Open No. 6-336403 describe water-floating preparations using cork powder as water-floating particle nuclei.

[0005] However, in the above-mentioned water-floating preparations, there is a new problem that the pesticide components are not uniformly diffused due to blowing by the wind, and although the improvement has been made, it is still not sufficient. It is hard. In addition, the above technique is not satisfactory from the viewpoint of increasing the content of the pesticidal active ingredient.

[0006]

Accordingly, a high concentration of the pesticidal active ingredient is carried, and the formulation thrown into the water surface of a paddy field or the like can be moved without settling on the soil surface and without causing the problem of wind blowing by the wind. However, during this time, there has been a demand for a preparation capable of promptly dispersing the pesticidal active ingredient or dispersing the pesticidal active ingredient slowly.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a formulation carrying an agricultural chemical component floats on the water surface immediately after spraying, but at least 24 hours to 48 hours. It was conceived that a water-administered preparation which solved the problem of wind storm by obtaining the property of sedimenting in time and then drifting on the water floor by wave wind or convection of water could be obtained. After conducting various searches for carriers capable of imparting the above properties to pesticide granules, kenaf (Hibiscus cannabinus Li)
nn./Hibiscus Sabdariffa Linn) was found to have such properties and the present invention was completed.

[0008] That is, the present invention provides an agricultural chemical composition for a paddy field containing an agricultural chemical active ingredient and crushed or crushed kenaf.

The present invention also provides an agricultural chemical composition for paddy fields using crushed or crushed kenaf as a grain nucleus.

[0010] The present invention further provides a carrier for an aqueous suspension formulation containing a crushed or pulverized kenaf as an active ingredient.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Hibiscus kenaf, a Malvaceae family used in the present invention, is a dicotyledonous, Malvaceae annual plant, and its origin is Africa or India. There are two types, cultivated in tropical and subtropical areas, and northern types cultivated in temperate zones. In the present invention, any kenaf can be used.

The crushed or crushed kenaf used in the present invention (hereinafter referred to as “kenaf pieces”) is obtained by mechanically cutting a kenaf stalk with or without a skin using a conventional wood cutting machine or the like. It is obtained by cutting, crushing and pulverizing, and its particle size is from 1 mm or less with a minor axis of 4 mm or less.
There are various grades up to and including mm.

[0013] Since the kenaf pieces can first carry a high concentration of the pesticidal active ingredient, they can be used as carriers for pesticides. Particularly, kenaf fine powder obtained by pulverizing kenaf pieces is a pesticide active ingredient similar to kaolin, bentonite, balm curite, attapulgite, pyrophyllite, talc, clay, calcium carbonate and slaked lime, diatomaceous earth, white carbon (synthetic silicic acid), etc. It has a carrying capacity and can be used as a substitute for them. Note that kenaf fine powder has a slightly lower oil absorbing ability than white carbon.

Further, the settled kenaf pieces have the property of floating on the water bottom. The floating rate and floating time when the kenaf pieces are thrown into water vary depending on the size of the grains, but generally, the larger the particle size, the easier it is to float. Utilizing this property, the floating time on the water surface immediately after spraying can be adjusted. This is a point that is significantly different from cork pieces conventionally used. In other words, the composition containing the cork pieces floats on the water, and may be blown near the ridge by wind blowing or the like, but the preparation using the kenaf pieces of the present invention is only good on the water bottom and is blown by the wind. There are few things.

[0015] The properties of kenaf pieces as described above make it possible to carry a high concentration of an agricultural chemical active ingredient in a formulation utilizing the same, and the formulation thrown into a paddy field moves on the water bottom without settling below the soil surface. During this period, most of the pesticidal active ingredients can be dispersed promptly, and some of the pesticidal active ingredients can be eluted slowly.

The preferred size of the kenaf pieces used in the agricultural chemical composition for paddy fields of the present invention depends on the amount of the pesticidal active ingredient contained and the method of use. For example, when the minor diameter of the kenaf pieces is 0.01 mm to 10 mm. Things can be mentioned.
More preferably, the minor diameter is in the range of 0.1 mm to 10 mm.

The content of kenaf pieces in the paddy field pesticide composition is usually about 10 to 90% by weight, but it depends on the concentration of the pesticidal active ingredient in the preparation and other kinds of ingredients such as surfactants. It can be changed accordingly. It is preferable to add about 15 to 50% by weight from the viewpoint of improvement in water transferability.

The production of the paddy field pesticide preparation of the present invention can be carried out in accordance with a method for producing a paddy field pesticide preparation generally used in the field of preparation, in addition to the above-mentioned kenaf pieces. For example, a pesticidal active ingredient that is liquid at room temperature, a surfactant and, if necessary, a pesticidal active ingredient that is solid at room temperature and an auxiliary agent are added and mixed to obtain a liquid or suspended liquid. In addition to the above, these components are supported on kenaf pieces to form a paddy agricultural chemical formulation. In this case, the essential components constituting the liquid pesticide composition need not always be supported on the kenaf pieces at the same time, but may be supported sequentially.
For example, a kenaf piece is first added to and mixed with a pesticidal active ingredient that is liquid at normal temperature, and then a mixture containing a surfactant is added to and mixed with this mixture, whereby the kenaf pieces carry each component in turn, thereby forming an agricultural chemical for paddy fields. Can be obtained.

The pesticidal active ingredient used in the paddy field pesticide composition of the present invention is not particularly limited as long as it is a compound generally useful as a pesticide, such as an insecticide, fungicide, herbicide or plant growth regulator. These compounds can be used alone or in combination of two or more.

Specific examples of the pesticidal active ingredient of the present invention include, but are not limited to, the following. In addition, those geometric isomers and optical isomers are also included.

(Herbicide) -S-ethyl 2-methyl-4-chlorophenoxythioacetate (phenothiol),
S- (4-chlorobenzyl) N, N-diethylthiocarbamate (benthiocarb), S-benzyl = 1,2-
Dimethylpropyl (ethyl) thiocarbamate (esprocap), S-ethylhexahydro-1H-azepine-1-carbothioate (molinate), 2-chloro-
2 ', 6'-diethyl-N- (butoxymethyl) acetanilide (butachlor), 2-chloro-2', 6'-diethyl-N- (2-propoxyethyl) acetanilide (pretilachlor), ethyl 4- (4- Chloro-o-
Tolyloxy) butyrate (MCPB ethyl), 2,4,6
-Trichlorophenyl-4'-nitrophenyl ether (CNP), α- (2-naphthoxy), propionanilide (naproanilide), methyl 5- (2,4-dichlorophenoxy) -2-nitrobenzoate (bifenox), S -1-methyl-1-phenylethyl piperidine-1-carbothioate (dimepiperate), O-3
-Tert-butylphenyl = 6-methoxy-2-pyridyl (methyl) thiocarbamate (pyributicarb),
(RS) -2-bromo-N- (α, α-dimethylbenzyl) -3,3-dimethylbutylamide (bromobutide), 2-benzothiazol-2-yloxy-N-methylacetanilide (mefenacet), 1- ( α, α
-Dimethylbenzyl) -3- (paratolyl) urea (Dimulon), methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluate (bensulfuronmethyl), 1- (2- Chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)
-3- (4,6-dimethoxypyrimidin-2-yl) urea (imazosulfuron), ethyl = 5- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylate (Pyrazosulfuron-ethyl), 2-methylthio-4,6-
Bis (ethylamino) -s-triazine (Simethrin), 2-methylthio-4,6-bis (isopropylamino) -s-triazine (Promethrin), 2-methylthio-4-ethylamino-6- (1,2- Dimethylpropylamino) -s-triazine (dimetamethrin),
2,4-dichlorophenyl-3′-methoxy-4′-nitrophenyl ether (chloromethoxynil), 5-tert-butyl-3- (2,4-dichloro-5-isopropoxyphenyl) -1,3,4-oxa Diazoline-2-
On (oxadiazone), 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-pyrazolyl-p-toluenesulfonate (pyrazolate), 2- [4-
(2,4-dichlorobenzoyl) -13-dimethylpyrazol-5-yloxy] acetophenone (pyrazoxifene), (RS) -2- (2,4-dichloro-m-tolyloxy) propionanilide (clomeprop),
2- [4- [2,4-dichloro-m-toluoyl] -1,
3-dimethylpyrazol-5-yloxy] -4'-methylacetophenone (benzophenap), S, S'-dimethyl = 2-difluoromethyl-4-isobutyl-6
Trifluoromethylpyridine-3,5-dicarbothioate (dithiopyr), 2-chloro-N- (3-methoxy-2-thenyl) -2 ′, 6′-dimethylacetanilide (thenylchlor), n-butyl- ( R) -2- [4-
(2-Fluoro-4-cyanophenoxy) phenoxy]
Propionate (cyhalofop butyl), 3- [1-
(3,5-dichlorophenyl) -1-methylethyl]-
2,3-dihydro-6-methyl-5-phenyl-4H-
1,3-oxazin-4-one (oxadichromemefone), 3- (4-chloro-5-cyclopentyloxy-
2Furilophenyl) -5-isopropylidene-1,3
-Oxazolidine-2,4-dione (pentoxazone), 1- (diethylcarbomoyl) -3- (2,4,6
-Trimethylphenylsulfonyl) -1,2,4-triazole (cafentrol), N-{[(4,6-
Dimethoxypyrimidin-2-yl) aminocarbonyl] {-1-methyl-4- (2-methyl-2H-tetrazol-5-yl) (azimulfuron), methyl 2-
[(4,6-Dimethoxypyrimidin-2-yl) oxy] -6-[(E) -1- (methoxyimino) ethyl]
Benzoate (pyriminobac-methyl), 4- (2-chloro-phenyl) -5-oxo-4,5-dihydro-tetrazole-1-cyclohexyl-ethyl carboxylate
Amide (fentrazamide), etc.

(Bactericide) O, O-diisopropyl-s-benzylthiophosphate (IBP), 3'-
Isopropoxy-2-methylbenzanilide (mepronil), α, α, α-trifluoro-3′-isopropoxy-o-toluanilide (flutranyl), 3,4,5,6-
Tetrachloro-N- (2,3-dichlorophenyl) phthalamic acid (teclophthalam), 1- (4-chlorobenzyl) -1-cyclopentyl-3-phenylurea (pencyclone), 6- (3,5-dichloro-4-) Methylphenyl) -3 (2H) -pyridazinone (dicromedin),
Methyl = N (2-methoxyacetyl) -N- (2,6-
Xylyl) -DL-alaninate (metalaxyl),
(E) -4-chloro-α, α, α-trifluoro-N-
(1-Imidazol-1-yl-2-propoxyethylidene) -o-toluidine (triflumizole), [5-
Amino-2-methyl-6- (2,3,4,5,6-pentahydroxycyclohexyloxy) tetrahydropyran-3
-Yl] amino-α-iminoacetic acid (kasugamycin),
Validamycin, 3-allyloxy-1,2-benzoisothiazole-1,1-dioxide (propenazole), diisopropyl-1,3-dithiolan-2-ylidene-malonate (isoprothiolane), 5-methyl-
1,2,4-triazolo [3,4-b] benzothiazole (tricyclazole), 1,2,5,6-tetrahydropyrrolo [3,2,1-ij] quinolin-4-one (pyroquilone), 5- Ethyl-5,8-dihydro-8-oxo [1,
3] dioxolo [4,5-g] quinoline-7-carboxylic acid (oxolinic acid), (Z) -2′-methylacetophenone = 4,6-dimethylpyrimidin-2-ylhydrazone 4,5,6,7- Tetrachlorophthalide (ferimzone), 3- (3,5-dichlorophenyl) -N-isopropyl-2,4-dioxoimidazolidin-1-carboxamide (iplodione), etc.

(Insecticide) O, O-dimethyl-O-
(3-methyl-4-nitrophenyl) thiophosphate (MEP), (2-isopropyl-4-methylpyrimidyl-6) -diethylthiophosphate (diazinone), dimethyldicarboxyethyldiphosphate (marathon), O, O- Dipropyl-O-4-methylthiophenyl phosphate (propaphos), 2,3-dihydro-22-dimethyl-7-benzo [b] furanyl = N
-Dibutylaminothio-N-methylcarbamate (carbosulfan), ethyl = N- [2,3-dihydro-2,
2-dimethylbenzofuran-7-yloxycarbonyl (methyl) aminothio] -N-isopropyl-β-alaninate (benflacarb), (RS) -α-cyano-
3-phenoxybenzyl = (RS) -2,2-dichloro-1- (4-ethoxyphenyl) cyclopropanecarboxylate (cycloprothrin), 1-naphthyl-N-
Methyl carbamate (NAC), O, O-diethyl-O
-(3-oxo-2-phenyl-2H-pyridazine-6
-Yl) phosphorothioate (pyridafentione),
O, O-dimethyl-O-3,5,6-trichloro-2-pyridyl phosphorothioate (chloropyrifosmethyl),
O, O-dimethyl-S- (N-methylcarbamoylmethyl) dithiophosphate (dimethoate), O, S-dimethyl-N-acetylphosphoramidothioate (acephate), ethyl paranitrophenylthionobenzenephosphonate (EPN) , 2-secondary butylphenyl-N-methylcarbamate (BPMC), 2- (4
-Ethoxyphenyl) -2-methylpropyl = 3-phenoxybenzyl = ether (ethofenprox),
1,3-bis (carbamoylthio) -2- (N, N-dimethylamino) propane hydrochloride (cartap), 5-dimethylamino-1,2,3-trithiane oxalate (thiocyclam), S, S '-2-dimethylaminotrimethylene =
Di (benzenethiosulfonate) (bensultap),
2-tert-butylimino-3-isopropyl-5
-Phenyl-1,3,5,6-tetrahydro-2H-1,
3,5-thiadiazin-4-one (buprofezin) and the like

(Plant growth regulator) 4'-chloro-2'-
(Α-hydroxybenzyl) isonicotineanilide (inabenfide), (2RS, 3RS) -1- (4-chlorophenyl) -4,4-dimethyl-2- (1H-1,2,
4-triazol-1-yl) pentan-3-ol (paclobutrazol), (E)-(S) -1- (4-
Chlorophenyl) -4,4-dimethyl-2- (1H-1,
2,4-triazol-1-yl) penta-1-ene-
And 3-ol (uniconazole).

The pesticidal active ingredient of the present invention can be used in combination of two or more. As a preferred specific example, as a part of the pesticidal active ingredient, among the above herbicides, benthiocarb or IBP is used. What was blended is mentioned.

The concentration of these pesticidal active ingredients in the preparation is not particularly limited, but is usually 0 to 100 parts by weight of the paddy field pesticide composition from the viewpoint of water transportability and biological activity. Preferably, the amount is from 0.1 to 70 parts by weight.

In the agricultural chemical composition for paddy fields of the present invention, when the pesticidal active ingredient is liquid at room temperature, it can be used as it is. However, when it is solid at room temperature, it can be dissolved or dispersed in a solvent to form a liquid. It is necessary to use. As a solvent that can be used for dissolving or dispersing a solid pesticidal active ingredient, a solvent generally used for pesticide formulations can be used as long as it does not react with a solute.
Examples of specific solvents include dioctyl phthalate, methylnaphthalene, alkylpyrrolidone, dimethylsulfoxide, dimethylacetamide, γ-butyrolactone, phenylxylylethane, glycerin, alkylene glycol, xylene, kerosene, methane series hydrocarbons, fatty acids Examples include organic solvents such as esters and polybasic acids, silicone oils, aqueous solutions of water-soluble salts in a sufficient amount to make the water-soluble film insoluble, and the above-mentioned pesticidal active ingredients which are liquid at room temperature. It is preferable that the compounding amount of these solvents is usually 10 parts by weight to 200 parts by weight based on 100 parts by weight of the pesticidal active ingredient.

It is more preferable to add a surfactant to the agricultural chemical composition for paddy fields of the present invention. Examples of the surfactant used include those generally used in agricultural chemical formulations, and these may be used alone or in combination of two or more.

Specific examples of the surfactant include polyethylene glycol higher fatty acid esters, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene aryl phenyl ether, sorbitan monoalkylate, acetylene alcohol and acetylene diol. Nonionic surfactants such as adducts of alkylene oxides, alkylaryl sulfonates, dialkyl sulfonates, lignin sulfonates, naphthalene sulfonates and condensates thereof, alkyl sulfates, alkyl phosphates Salt, alkyl aryl sulfate, alkyl aryl phosphate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl arylate Can be exemplified sulfuric acid ester salts, polyoxyethylene aryl phenyl ether sulfate, an anionic surfactant such as a polycarboxylic acid type polymer active agent. Further, a silicone-based surfactant, a fluorine-based surfactant, and the like can also be used.

The mixing ratio of these surfactants is usually 0.1 to 30 parts by weight, preferably 0.5 to 20 parts by weight, more preferably 1 to 100 parts by weight, per 100 parts by weight of the composition. It is 10 parts by weight to 10 parts by weight.

In the present invention, the kenaf pieces may be coated with a water-soluble polymer or a water-swellable substance. In this case, the water-soluble polymer or the water-swellable substance is removed from the surface layer of the kenaf pieces as the grain nuclei. It exists solely in the interior and does not adhere the pesticidal active ingredient to the kenaf pieces.

The water-soluble polymer that can be used in the present invention is preferably a solid at room temperature, and any substance may be used as long as it is a substance that does not dissolve in the above-mentioned liquid pesticidal active ingredient at room temperature. It is desirable that the viscosity be 100 mPa · s or more, more preferably 500 mPa
・ S is better than s. The viscosity of the aqueous solution can be measured with, for example, a rotational viscometer.

Specific examples of the water-soluble polymer include sodium polyacrylate having a molecular weight of 5,000 or more, dextrin, polyvinyl alcohol, carboxymethylcellulose, xanthan gum, gum arabic, polyvinylpyrrolidone, and polyalkylene glycol having a molecular weight of 100,000 or more. But not limited to. These water-soluble polymers may be used alone or in combination of two or more.

The water-swellable substance which can be used in the present invention is preferably a substance which is solid at room temperature and does not dissolve in the above-mentioned liquid pesticidal active ingredient at room temperature, and specifically, bentonite is preferred. Bentonite is a group of typical minerals that make up clay, which means montmorillonite group minerals and mineral groups mainly composed of them, and its structure is composed of phyllosilicate minerals with a three-layer structure, May be replaced by a metal such as sodium, calcium and magnesium. Particularly, in the present invention, bentonite containing sodium is preferable.

The paddy agricultural chemical formulation of the present invention may further contain various additives commonly used in the production of paddy agricultural chemicals to such an extent that the activity of the agricultural chemical active ingredient and the migration of the formulation into water are not affected. Other auxiliaries can be added for the purpose. Other adjuvants include binders, specific gravity adjusters, disintegrants,
(Dispersing agent, wetting agent), extender, (solvent), emulsifier, lubricant, water repellent, (foaming agent), other water surface spreader, particle growth inhibitor, stabilizer and the like.

The agricultural chemical composition for paddy fields of the present invention can be used after being packaged in a water-soluble film. As the water-soluble film that can be used in the present invention, a film that rapidly dissolves and disperses in water is suitable, and as the material of the film, polyvinyl alcohol, polyoxypolyalkylene glycol, hydroxypropyl methylcellulose, methylcellulose, carboxy Sodium methylcellulose, sodium polyacrylate, alginic acid,
Gelatin, pullulan, soluble starch, etc., further, water-soluble paper, hydrolyzed paper, etc. are exemplified, but are not particularly limited as long as they are not dissolved in the liquid pesticidal active ingredient at room temperature in the liquid pesticide composition. Not something.

Although the thickness of the water-soluble film used is not particularly limited, it is generally preferably about 20 to 100 μm. Further, multiple packaging may be performed using water-soluble films of the same composition or different compositions. In addition, in order to suppress the formation of an air dome and improve the dissolution of the water-soluble film during the treatment, about 1 to 100 holes having a diameter of about 0.1 to 1 mm may be formed per bag of the preparation.
Alternatively, when performing heat sealing, a gap through which air may escape may be provided in the heat sealing portion.

In the present invention, when other additives are blended, the content in the preparation is usually about 0 to 30% by weight, preferably about 0 to 20% by weight, more preferably about 0 to 10% by weight.
In particular, when the additive is, for example, a binder, the content in the preparation is usually about 0 to 10% by weight, preferably about 0 to 5% by weight, more preferably about 0 to 5% by weight.
It is preferable to adjust to 2% by weight.

More specific examples of the formulation of the agricultural chemical for paddy fields of the present invention include, for example, about 1 to 80% by weight of an agricultural chemical active ingredient,
Preferably about 5-50% by weight, kenaf pieces about 10-90%
% By weight, preferably about 15 to 50% by weight, the surfactant about 0.1 to 30% by weight, preferably about 5 to 20% by weight,
Examples of the additive include those containing about 0 to 20% by weight, preferably 0 to 10% by weight of other additives.

The paddy agricultural chemical preparation of the present invention obtained as described above contains a safe and low toxic agricultural chemical active ingredient, kenaf pieces,
Since it is manufactured using a surfactant and other additives (for example, a binder, a specific gravity adjusting agent, etc.), it can be used as a safe and low-toxic pesticide.

The thus obtained agricultural chemical for paddy fields of the present invention can be used in the same manner as the same type of preparation for surface administration on water. That is, the amount to be charged into a paddy field or the like varies depending on the kind and content of the contained pesticidal active ingredient, but is usually about 10 to 2000 g, preferably about 20 to 15 g per 10 ares of the water surface.
00 g. In addition, a known method generally used for spraying pesticides can be used as the dosing method.For example, the spraying method may be directly applied to paddy fields, or the paddy herbicide of the present invention packaged in a water-soluble film may be thrown into paddy fields. Can also be used. The paddy agricultural chemical formulation of the present invention is preferably stored in, for example, a container containing a desiccant in order to avoid moisture. As such a container, for example, a moisture-proof kraft paper bag, a polyethylene bag, or the like is convenient.

[0042]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, Comparative Examples and Test Examples, but the present invention is not limited to these. Parts represent parts by weight.

Example 1 A liquid agricultural chemical composition was obtained by mixing 51 parts of IBP, 2.5 parts of polyoxyethylene nonylphenyl ether and 4 parts of ligninsulfonate. This and a kenaf piece (short diameter 0.
5mm ~ 2mm, long diameter 2mm ~ 10mm, bulk specific gravity 0.0
6) The mixture was mixed with 42.5 parts to obtain a paddy agricultural chemical composition of the present invention.

Example 2 30 parts of Benthiocarb, 4.8 parts of MCPB ethyl, 9 parts of simethrin, 9 parts of mefenacet, 1 part of polyoxyethylene styryl phenyl ether sulfate, 1 part of polyoxyethylene alkyl phenyl ether sulfate, 1 part of dioctyl sulfo A liquid pesticide composition was obtained by mixing 0.2 part of succinate and 2 parts of acetylene alcohol. This and kenaf pieces (minor diameter 0.5 mm to 2 mm, major diameter 2 mm to 1
(0 mm, bulk specific gravity 0.06) and 43 parts to obtain a paddy field pesticide composition of the present invention.

EXAMPLE 3 42.9 parts of benthiocarb, bensulfuron-methyl 1.
5 parts, Mefenacet 8.6 parts, polyoxyethylene aryl phenyl ether sulfate ammonium salt
A liquid pesticide composition was obtained by mixing 1.2 parts, 1.5 parts of a polyoxyalkylene alkyl ether sulfate ammonium salt, and 2.3 parts of a dialkyl sulfosuccinate.
This and kenaf pieces (short diameter 0.5mm-2mm, long diameter 2mm
-10 mm and a bulk specific gravity of 0.06) 42 parts to obtain a paddy agricultural chemical composition of the present invention.

Example 4 42.9 parts of benthiocarb, bensulfuron-methyl 1.
5 parts, Mefenacet 8.6 parts, polyoxyethylene aryl phenyl ether sulfate ammonium salt
A liquid agricultural chemical composition was obtained by mixing 1.2 parts, 1.5 parts of polyoxyalkylene alkyl ether sulfate ammonium salt, 2.3 parts of dialkyl sulfosuccinate, and 1 part of powdered sodium polyacrylate having a molecular weight of 1,000,000. . This and kenaf pieces (short diameter 0.5mm-2mm, long diameter 2
mm-10 mm, bulk specific gravity 0.06) 41 parts was mixed with a water-soluble film made of polyvinyl alcohol.
35 g per bag was placed, heat sealed and closed to obtain the paddy agricultural chemical composition of the present invention. The present pesticide composition is sprayed at 10 pieces per 10a.

Comparative Example 1 A liquid pesticide composition was obtained by mixing 51 parts of IBP, 2.5 parts of polyoxyethylene nonylphenyl ether and 4 parts of ligninsulfonate. This and pumice stone (shorter diameter 0.2m
m-0.5 mm, bulk specific gravity 0.66) to obtain a pesticide composition.

Comparative Example 2 Benthiocarb 30 parts, MCPB methyl 4.8 parts, simethrin 9 parts, mefenacet 9 parts, polyoxyethylene styryl phenyl ether sulfate 1 part, polyoxyethylene alkyl phenyl ether sulfate 1 part, dioctyl sulfo A liquid pesticide composition was obtained by mixing 0.2 part of succinate and 2 parts of acetylene alcohol. This and a piece of wood (short diameter 0.2mm-0.5mm, bulk specific gravity 0.23)
This was mixed with 43 parts to obtain an agricultural chemical composition.

Comparative Example 3 Benthiocarb 42.9 parts, Bensulfuron-methyl 1.
5 parts, Mefenacet 8.6 parts, polyoxyethylene aryl phenyl ether sulfate ammonium salt
A liquid pesticide composition was obtained by mixing 1.2 parts, 1.5 parts of a polyoxyalkylene alkyl ether sulfate ammonium salt, and 2.3 parts of a dialkyl sulfosuccinate.
This and a piece of wood (shorter diameter 0.2mm-0.5mm, bulk specific gravity 0.2
3) The mixture was mixed with 42 parts to obtain an agricultural chemical composition.

Test Example 1 Water transfer test: The agricultural chemical preparation for paddy fields obtained in Examples 1 to 3 and a commercially available representative water surface application agent (Prospar 1 kilo granule) were tested for their water transfer ability by the following method. Was measured. First, put rice paddy soil about 1c in a 2000ml beaker.
m, and 500 ml of tap water was allowed to stand. 0.5 g of each paddy field pesticide formulation was added thereto, and after 12 hours, the dropping property in water was observed, and further, the state of the water in the beaker when it was shaken was visually observed.

As a result, in all of the preparations of Examples 1 to 3, about 90% of the preparations fell to the soil surface 12 hours after the introduction of the drug. After 24 hours, all had dropped on the paddy soil surface. Due to the vibration of the water in the beaker, it was observed that kenaf pieces placed on the surface of the paddy soil moved. In contrast, such a phenomenon was not observed in commercially available granules for water surface application.

Test Example 2 A net frame having a diameter of 50 cm was installed at the point A of a 2 m × 20 m paddy field having a depth of 5 cm shown in FIG. 1 and Examples 1 to 3 and Comparative Examples 1 to 3 were set in the frame. 14 g of the pesticide composition was treated. Twenty-four hours after spraying (after the pesticide compositions of Examples 1 to 3 settled to the bottom of the water), the net frame was removed, and 24 hours later, the appearance of the pesticide compositions scattered in the paddy field was visually observed. The water temperature during the test was 20 ° C to 27 ° C.
A wind with a wind speed of 3 to 5 m was blowing from the point to the point B. Table 1 shows the results.

[0053]

[Table 1]

Test Example 3 Uniform diffusion test: 10 m shown in FIG.
Two paddy fields of × 10 m were prepared. To those E points, 35 g of the paddy field pesticide composition obtained in Example 4 was introduced. One paddy was left as it was after being put. Also,
The other paddy was covered with a cylindrical net having a diameter of 1 m so that the input kenaf pieces did not move. Twenty-four hours after the introduction, the water and soil in the parts A to I of the paddy field left as it is were collected, the content of the pesticide component therein was measured, and theoretically, when the pesticide active component was uniformly sprayed. The ratio when the component concentration in soil was 100% was determined. The water temperature during the test was 20 to 25 ° C., and a wind with a wind speed of 2 to 5 m was blowing from point A to point I. In addition, the treated soil (point E) of the paddy paddy field covered with a net was collected in a range of 10 cm in radius and 5 cm in depth, including kenaf pieces and excluding kenaf pieces, together with a part of water and analyzed. The results are shown in Tables 2 and 3.

[0055]

[Table 2]

[0056]

[Table 3]

From these results, it can be seen that most of the pesticidal active ingredient diffuses into the water in a short time, but a part remains in the kenaf pieces and has a residual effect of eluting the pesticide active ingredient while moving on the water bottom. Understand. Also, even if it exists on the bottom of the water,
Since the pesticidal active ingredient is present inside the kenaf pieces, it is understood that the influence of the soil residue is small.

[0058]

The kenaf pieces used in the paddy field pesticide formulation of the present invention have the property of floating above the water bottom.
In addition, since the kenaf pieces have excellent oil-impregnating properties, they can carry the pesticidal active ingredient at a high concentration.

Accordingly, in the paddy pesticide preparation of the present invention containing kenaf pieces, most of the pesticidal active ingredient diffuses in water in a short time, but a part of the pesticide active ingredients stays in the kenaf pieces and moves on the bottom of the water. Since it has a residual effect of releasing the active ingredient, it does not cause a problem of blowing by the wind, and has good water transferability, so that it can be advantageously used as a pesticide formulation.

Therefore, it can be widely used as a new type of water-injectable agricultural chemical for paddy fields.

[Brief description of the drawings]

FIG. 1 is a drawing showing a 2m × 20m paddy field used in Test Example 2. In the figure, the point A is a point of introduction of the paddy field composition.

FIG. 2 is a drawing showing a 10 × 10 m paddy field used in Test Example 3. In the figure, point E is the point of input of the paddy field composition. that's all

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A01N 43/78 101 A01N 43/78 101 47/12 47/12 Z 47/36 101 47/36 101E 57 / 14 57/14 H

Claims (11)

[Claims] 1. An agricultural chemical active ingredient and kenaf (Hibiscus cannabinus L) of the genus Malvaceae plant
inn./Hibiscus Sabdariffa
Linn.), Which is a crushed or pulverized product of a paddy field. 2. The agricultural chemical composition for paddy fields according to claim 1, further comprising a surfactant. 3. The agricultural chemical composition for a paddy field according to claim 1, wherein the agricultural chemical active ingredient is liquid at ordinary temperature, or a solid agricultural chemical active ingredient is dissolved or dispersed in a solvent. 4. The agricultural chemical composition for a paddy field according to any one of claims 1 to 3, comprising a plurality of active agricultural chemical ingredients, at least one of which is benthiocarb or IBP. 5. The crushed kenaf or a crushed product having a minor axis of 0.1.
The agricultural chemical composition for paddy fields according to any one of claims 1 to 4, wherein the bulk specific gravity is 1 to 10 mm and the bulk specific gravity is 1 or less. 6. The agricultural chemical composition for a paddy field according to claim 2, wherein the surfactant is an anionic surfactant. 7. The agricultural chemical composition for a paddy field according to any one of claims 1 to 6, wherein the agricultural chemical composition is a solid agricultural chemical composition. 8. The solid agricultural chemical composition according to claim 7, wherein the solid agricultural chemical composition is granular.
Item 4. The agricultural chemical composition for paddy fields according to Item 1. 9. The agricultural chemical composition for paddy fields according to claim 1, wherein a crushed or pulverized kenaf is used as a grain nucleus. 10. The agricultural chemical composition for a paddy field according to claim 1, which is a preparation which is packaged in a water-soluble film and thrown into a paddy field. 11. A carrier for an aqueous suspension formulation containing a crushed or ground kenaf as an active ingredient.