JP3245588B2 - Paddy field weeding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention provides a simple tablet or capsule for application of a medicine in paddy field weeding,
It is another object of the present invention to provide a simple chemical treatment method.

[0002]

2. Description of the Related Art Conventionally, weeding methods for paddy fields, especially in the early stages of rice cultivation.
The mid-term weeding method includes a method in which the herbicidal component is finely powdered solid carrier, fine granules prepared with other auxiliaries, a method in which granules are sprayed as is, and a method in which a wettable powder is diluted with a large amount of water before spraying. However, other methods that do not use a finely divided solid carrier include a method in which an emulsion in which a herbicidal component is dissolved in an organic solvent is sprayed as it is, and a method in which a finely pulverized herbicidal component is dispersed and suspended in water as a sprayable agent as it is. Is mentioned.

[0003]

However, fine granules,
In application of granules and wettable powders, paddy fields are usually used to spray granules, for example, usually 3 to 4 kg per 10 ares, while holding a heavy sprayer or granulator containing the medicine. The drug must be evenly and evenly distributed, either by walking around or by using a large Niagara hose from the levee. Therefore, transporting and spraying the chemicals requires not only severe labor, but also the rice seedlings, which are often damaged, which is not desirable in terms of growth. Even when applying emulsions and Flourables, the weight of the drug is reduced to some extent and a large sprayer is not required, but it is necessary to use a container that discharges a fixed amount of medicine. Need to walk around. SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional method, and is to perform weeding of a paddy field by a simple method without using a special chemical sprayer.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a paddy field herbicide characterized in that the whole amount of the drug applied to the paddy field contains a herbicidal component, a surfactant and a binder which are substantially dissolved in the rice field. Tablets or capsules, and the tablets or capsules are applied to a flooded paddy field so that 10 to 200 tablets per 10 ares and the total weight of the tablets or capsules is 200 to 1,500 g; This is a paddy field herbicidal method characterized by dissolving and dispersing the entire amount of a herbicidal component in field water.

The present invention provides: [1] a tablet or capsule for paddy field herbicide, characterized in that the whole amount of the drug applied to the paddy field contains a herbicidal component, a surfactant and a binder which are substantially dissolved in the rice field. [2] The capsule according to the above, wherein any one of (1) the mixed and ground product of the herbicidal component, the surfactant and the binder, or (2) the granules obtained by granulating the mixed and ground product is wrapped with a water-soluble film. The tablet or capsule for paddy field weeding according to [1]. [3] Tablets or capsules containing a herbicidal component, a surfactant and a binder are added in an amount of 10 to 200 per 10 ares.
And the total weight of tablets or capsules is 200 to 1,50
A paddy field herbicidal method, wherein the tablet or capsule contains a foaming agent, wherein the tablet or capsule is applied to a flooded paddy field to dissolve and disperse substantially the entire amount of the herbicidal component in the field water; And the paddy weeding tablet or capsule according to [1] or [2], or the paddy weeding method according to [3]; and

[5] The herbicidal component is N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -3.
-Methyl-5- (2-chloro-2,2-difluoroethoxy-4-isothiazolesulfonamide, methyl-α-
(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluylate, N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4
-Ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide, N- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) Urea, 3- (4,6-dimethoxy-
1,3,5-triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl] urea, 2-
Methylthio-4,6-bis (ethylamino) -s-triazine, 2-methylthio-4-ethylamino-6- (1,2-
Dimethylpropylamino) -s-triazine, 3,7-dichloro-8-quinolinecarboxylic acid, 2-chloro-2 ', 6'
-Diethyl-N- (2-propoxyethyl) acetanilide, 2-chloro-2 ', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-benzothiazol-2-yloxy-N-methylacetanilide, N- [ 2 '-(3'
-Methoxy) -thienylmethyl] -N-chloroaceto-
2,6-dimethylanilide, 2 ′, 6′-diethyl-N-[(2
-Cis-butenooxy) methyl] -2-chloroacetanilide, exo-1-methyl-4- (1-methylethyl)
-2- (2-methylphenyl) methoxy-7-oxabicyclo [2,2,1] heptane, S, S-dimethyl-2-difluoromethyl-4- (2-methylpropyl) -6- (trifluoromethyl ) At least one selected from the group consisting of -3,5-pyridinedicarbothioate and 2- (3,5-dichlorophenyl) -2- (2,2,2-trichloroethyl) oxirane The present invention provides the paddy field weeding tablet or capsule according to any one of [1], [2] and [4] or the paddy field weeding method according to [3] or [4].

[0007] In another aspect, the present invention provides: [6] A paddy field characterized in that the entire amount of the drug applied to the paddy field contains a herbicidal component, a surfactant and a binder which are substantially dissolved in the paddy water. A paddy field herbicidal method comprising applying a herbicidal tablet to a flooded paddy field and dissolving and dispersing substantially the entire amount of the herbicidal component in field water; [7] containing a herbicidal component, a surfactant and a binder The tablets to be applied are applied to flooded paddy fields so that 10 to 200 tablets per 10 ares and the total weight of the tablets is 200 to 1,500 g, and substantially all of the herbicidal components are dissolved in the water. [8] The method according to [6] or [7], wherein the tablet contains a foaming agent; and

[0008]

[9] The herbicidal component is N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -3.
-Methyl-5- (2-chloro-2,2-difluoroethoxy-4-isothiazolesulfonamide, methyl-α-
(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluylate, N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4
-Ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide, N- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) Urea, 3- (4,6-dimethoxy-
1,3,5-triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl] urea, 2-
Methylthio-4,6-bis (ethylamino) -s-triazine, 2-methylthio-4-ethylamino-6- (1,2-
Dimethylpropylamino) -s-triazine, 3,7-dichloro-8-quinolinecarboxylic acid, 2-chloro-2 ', 6'
-Diethyl-N- (2-propoxyethyl) acetanilide, 2-chloro-2 ', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-benzothiazol-2-yloxy-N-methylacetanilide, N- [ 2 '-(3'
-Methoxy) -thienylmethyl] -N-chloroaceto-
2,6-dimethylanilide, 2 ′, 6′-diethyl-N-[(2
-Cis-butenooxy) methyl] -2-chloroacetanilide, exo-1-methyl-4- (1-methylethyl)
-2- (2-methylphenyl) methoxy-7-oxabicyclo [2,2,1] heptane, S, S-dimethyl-2-difluoromethyl-4- (2-methylpropyl) -6- (trifluoromethyl ) At least one selected from the group consisting of -3,5-pyridinedicarbothioate and 2- (3,5-dichlorophenyl) -2- (2,2,2-trichloroethyl) oxirane The method according to any one of [6] to [8] is provided.

In another aspect, the present invention provides, in particular, [10] a tablet for paddy field herbicide applied directly to a flooded sewage paddy, wherein the whole amount of the drug is applied to the flooded sewage paddy when applied to the flooded sewage paddy. A paddy field herbicidal tablet characterized in that it contains a herbicidal component, a surfactant and a binder, wherein the concentration of the herbicidal component in the water is not more than the solubility of the herbicidal component in water (25 ° C.) assuming dissolution; 11] The herbicidal component is N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -3-methyl-5.
-(2-chloro-2,2-difluoroethoxy-4-isothiazolesulfonamide, methyl-α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)
-O-toluylate, N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4-ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide,
N- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) urea, 3- (4,6-dimethoxy-1,3 , 5-Triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl] urea, 2-methylthio-
4,6-bis (ethylamino) -s-triazine, 2-methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine, 3,7-dichloro-8-
Quinolinecarboxylic acid, 2-chloro-2 ', 6'-diethyl-
N- (2-propoxyethyl) acetanilide, 2-chloro-2 ', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-benzothiazol-2-yloxy-N
-Methylacetanilide, N- [2 '-(3'-methoxy)
-Thienylmethyl] -N-chloroaceto-2,6-dimethylanilide, 2 ', 6'-diethyl-N-[(2-cis-butenooxy) methyl] -2-chloroacetanilide, exo-1-methyl-4- (1-methylethyl) -2- (2-methylphenyl) methoxy-7-oxabicyclo [2,2,1]
Heptane, S, S-dimethyl-2-difluoromethyl-4
-(2-methylpropyl) -6- (trifluoromethyl)
At least one or more selected from the group consisting of -3,5-pyridinedicarbothioate and 2- (3,5-dichlorophenyl) -2- (2,2,2-trichloroethyl) oxirane (10) paddy field herbicidal tablet according to; (12) paddy field herbicidal method characterized by directly applying the tablet according to (10) or (11) to a flooded paddy field; and (13) the tablet 10 to 200 per 10 ares
And directly applied to a flooded paddy field so that the total weight thereof is 200 to 1500 g.
2] A paddy field weeding method described in [2] is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the herbicidal component defined that the total amount of the drug applied to the paddy field is substantially dissolved in the paddy water means the following. That is, the herbicidal component is applied to a paddy field in an amount sufficient to exert a herbicidal effect, that is, a practically sufficient amount of a herbicidal component that does not substantially damage the rice seedlings but exerts a herbicidal effect. It means a herbicidal component whose rice water concentration is not higher than the solubility of the herbicidal component in water (25 ° C.).

Specific examples of the herbicidal component include, for example, N-
[(4,6-Dimethoxypyrimidin-2-yl) aminocarbonyl] -3-methyl-5- (2-chloro-2,2-difluoroethoxy-4-isothiazolesulfonamide (A-1), methyl-α -(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluylate (A-2), N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4-ethoxycarbonyl -1-methyl-5-pyrazolesulfonamide, N
-(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) urea, 3- (4,6-dimethoxy-1,3, Sulfonamides such as 5-triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl] urea; 2
Triazines such as -methylthio-4,6-bis (ethylamino) -s-triazine (A-5) and 2-methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine Quinoline carboxylic acids such as 3,7-dichloro-8-quinoline carboxylic acid (A-3);
2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide, 2-chloro-2', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-benzothiazol-2-yloxy -N-methylacetanilide, N- [2 '-(3'-methoxy) -thienylmethyl]-
N-chloroaceto-2,6-dimethylanilide, 2 ', 6'-
Diethyl-N-[(2-cis-butenooxy) methyl] -2
-Anilides such as chloroacetanilide; exo-1
-Methyl-4- (1-methylethyl) -2-[(2-methylphenyl) methoxy-7-oxabicyclo [2,2,1] heptane, S, S-dimethyl-2-difluoromethyl-4- ( Two
-Methylpropyl) -6- (trifluoromethyl) -3,
5-pyridinedicarbothioate, 2- (3,5-dichlorophenyl) -2- (2,2,2-trichloroethyl) oxirane, etc., are soluble in water, and have an effect on rice and weeds. Considering the above, sulfonamides, triazines and quinolinecarboxylic acids are preferred.

With respect to the herbicidal component, for example, the herbicidal component A-2 is generally applied in a practical amount of 5 to 7.5 g per 10 ares as a practical herbicide for the early to middle stage of rice cultivation. In this case, it is assumed that the flooding depth is 5 cm. Sometimes the water concentration is 0.1-0.15pp
m, whereas the solubility of A-2 (25 ° C.) is 8 ppm, so that A-2 corresponds to the herbicidal component of the present invention. However, the herbicidal component 4- (2,4-dichlorobenzoyl)-
1,3-dimethyl-5-phenacyloxypyrazole (A
-4) is applied in an amount of 180-300 g per 10 ares as a practical herbicide for paddy rice from the early stage to the middle stage, and the flooding depth is 5
Although the concentration of rice water in cm becomes 3.6 to 6 ppm, the solubility (25 ° C.) of A-4 is 0.9 ppm, so that A-4 does not correspond to the herbicidal component of the present invention. In this regard, the herbicidal component A-2 is not only easy to formulate due to its small content in tablets or capsules than A-4, but also when the product is applied to paddy fields, This is because A-4 quickly dissolves in the water, diffuses widely, and is uniformly dispersed, whereas A-4 sediments on the bottom of the water in a solid state and hardly dissolves and hardly disperses.

The surfactant used in the present invention imparts hydrophilicity to a herbicidal component, a binder, and the like. Examples thereof include sodium dodecylbenzenesulfonate, dialkylsulfosuccinate, sodium lauryl sulfate, sodium ligninsulfonate, and polyoxygen. Anionic surfactants such as ethylene alkyl aryl ether sulfate, β-naphthalene sodium sulfonate formalin condensate, dinaphthalene methane sulfonate, sodium alkyl allyl sulfonate and sodium alkyl naphthalene sulfonate: polyoxyethylene nonyl phenyl ether, polyoxy Ethylene oleyl ether, sorbitan monostearate, polyoxyethylene oleate, polyoxyethylene alkyl aryl ether,
Non-ionic surfactants such as polyoxyethylene alkyl ether, sorbitan monooleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene fatty acid ester, and polyoxyethylene styryl phenyl ether are exemplified. These surfactants may be used alone or as a mixture of two or more thereof, or may be used as a mixture of anionic and nonionic surfactants.

The binder used in the present invention binds the particles of the herbicidal component and is preferably a water-soluble binder, such as carboxymethylcellulose, a salt thereof,
Stearic acid, salts thereof, dextrin, polyethylene glycol, starches and the like can be mentioned. The use of surfactants and binders is essential, but their choice depends on the type of herbicidal component and the blending ratio of the entire formulation,
In practice, appropriate ones must be selected through trial and error experiments.

The tablet or capsule for paddy field herbicide of the present invention contains the herbicidal component, a surfactant and a binder. For example, the surfactant is contained in an amount of 0.1 to 20 parts by weight based on 1 part by weight of the herbicidal component. Although it contains 0.1 to 20 parts by weight of a binder and 0.1 to 20 parts by weight, it is needless to say that a compound outside the above-mentioned range is included in the present invention as long as the desired effect is exhibited. Further, the tablet or capsule of the present invention may contain an acidic substance, a foaming agent, a solid carrier, and other agricultural chemical auxiliaries in addition to the above three components. Further, the solubility of the herbicidal component of the present invention in water, the herbicidal component other than the herbicidal component of the present invention, a bactericidal component, an insecticidal component, a plant growth regulating component, a fertilizer component, and the like, as long as they do not significantly impair the dispersibility. Can also.

Examples of the acidic substance include organic acids such as citric acid, tartaric acid, oxalic acid, succinic acid, maleic acid, phthalic acid, malic acid and adipic acid; sodium dihydrogen phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate And hydrogen salts such as potassium hydrogen sulfate. The blowing agent reacts with water or an acid to generate a gas. Examples thereof include carbonates such as sodium carbonate, potassium carbonate, calcium carbonate, and magnesium carbonate; bicarbonate; Bicarbonates such as sodium and potassium bicarbonate; percarbonates such as sodium percarbonate; calcium carbide and ammonium carbonate. Examples of solid carriers include kaolin, talc, clay, bentonite, finely divided silica, mineral fine powders such as siegrite; anhydrous sodium sulfate, urea, and the like. Examples include a decomposition inhibitor, a safener, a dispersion stabilizer, a disintegrant, and a desiccant. Their use amounts cannot be specified unconditionally, but generally 10 to 50 parts by weight of an acidic substance and 10 to 9 parts by weight of a foaming agent as a ratio to the whole tablet or capsule.
0 parts by weight, 0.1 to 90 parts by weight of solid carrier and 0.1 to 20 parts by weight of other agricultural chemical auxiliaries. When an acidic substance and a foaming agent are used, their use is preferred because the solubility and dispersibility of the herbicidal component in water are improved.

The tablet or capsule of the present invention is usually easily produced by a method practiced in the field of medicine or a method analogous thereto. In general, when the herbicidal component is a solid, it is used as fine particles having a particle size of 1 to 200 µ, preferably 1 to 100 µ by being pulverized in advance to enhance solubility and dispersibility in water. As a method for producing a tablet, for example, three components are uniformly mixed by simultaneously mixing three components of a herbicidal component, a surfactant, and a binder, or by mixing another component with two components mixed in advance, Particle size 1-200μ
Into a tablet by compression molding using a tableting machine according to an ordinary method. When using an acidic substance or a foaming agent here, a method in which these are uniformly mixed with a binder in advance and ground, and then mixed with a herbicidal component and a surfactant, or when a solid carrier or other pesticide auxiliary is used. And a method in which the mixture is uniformly mixed with a herbicidal component and a surfactant in advance and ground to form a wettable powder and then mixed with a binder. The above-mentioned tablet production method is, of course, appropriately changed in consideration of the medicinal properties, formulation properties, and the like, and an appropriate one is implemented. Tablets are manufactured in various shapes and sizes, such as a circular plate, an oval plate, a square plate, a rod, and an elliptical sphere, depending on the manufacturing method and tableting machine. Since the drug effect is not greatly affected by the shape of the tablet, any shape, size, and weight may be used, but the shape is a tablet, the size is 1 to 5 cm in diameter, and the thickness is 0.2 to 3cm,
Those weighing 1 to 150 g are preferable in terms of formulation and drug application.

As a method for producing the capsule of the present invention, for example, a herbicidal component, a surfactant and a binder are uniformly mixed,
If necessary, add an acidic substance, a solid carrier or other pesticide auxiliaries, uniformly mix them, and pulverize the crushed material to a particle size of 1 μm to
Granulate to 1.5 mm, and granulate the polyvinyl alcohol,
The capsules made of water-soluble cellulose, gelatin or the like are filled, or the above-mentioned pulverized product and wettable powder are filled as they are without granulation. This capsule also has the same shape, size and weight as in the case of the tablet, but the shape is elliptical spherical and the size is 1 to 10 cm in diameter and 1 to 10 cm in length,
Those weighing 1 to 150 g are preferred. In addition to the capsules of the present invention, in addition to those prepared as described above, the above-mentioned pulverized material or wettable powder is not filled in a capsule container, but is directly wrapped with a water-soluble film such as polyvinyl alcohol, water-soluble cellulose, or gelatin. Including.

When the tablet or capsule of the present invention is applied to a flooded paddy field, the tablet or capsule usually once sinks to the bottom of the water, but upon contact with water, the herbicidal component is quickly eluted into the field water and diffuses uniformly in the water. I do. Tablets or capsules using an acidic substance and a foaming agent settle on the bottom of the water and float on water or on the water surface due to the generation of gas, so that their disintegration is accelerated, and the solubility and dispersibility of the herbicidal components are further promoted. In a paddy field, convection occurs in the paddy water due to a difference in temperature between day and night, a difference in water depth, and the like, which also promotes the dispersion of the herbicidal components. Thus, in the present invention, substantially the entire amount of the herbicidal component can be dissolved and dispersed in the tap water immediately after administration of the drug, and, for example, the herbicidal component can be uniformly distributed in the tap water after several hours to several days. Weeds can be uniformly controlled without causing harm to rice.

In the present invention, 10 tablets or capsules are used.
It is applied so that the total weight of tablets or capsules is 200 to 1,500 g per are,
If the amount deviates greatly from this range, it is not desirable in terms of medicinal properties and phytotoxicity, or a great deal of labor is required for the spraying operation. For the preferred method of application, tablet or capsule manufacturing method, size,
Herbicidal components, surfactants, types of binders and other additives, cannot be specified unconditionally due to differences in the mixing ratio, etc.
5 to 150 g of the herbicidal component per 10 ares is divided into tablets or capsules in an amount of 0.05 to 15 g.
Apply 100 months. Thus, tablets or capsules are 10-
It is only necessary to apply one to 100 m ² , so that it is sufficient to throw the water into the paddy field of the area from the ridge without entering the paddy field, so that the spraying operation is simple and advantageous compared to the conventional drug application method. The present invention generally relates to transplantation of rice seedlings from 5 days to 1 day.
In the case of direct sowing of rice after 5 days, the most favorable effect can be obtained when applied to the early to middle stage of paddy rice cultivation 10 to 20 days after sowing, but application of the tablets or capsules does not particularly hinder medicinal effects and phytotoxicity. Unless otherwise stated, it may be applied at other times. Even if the tablet or capsule of the present invention is once dissolved or dispersed in an appropriate amount of water and applied locally to a paddy field, desirable effects in terms of medicinal properties and phytotoxicity can be obtained.

[0021]

Examples Examples of the present invention will be described, but the present invention is not limited by these descriptions. Example 1 (Formulation Examples) Components used in each formulation example and their abbreviations are described below. The amount of each component used is expressed on a weight basis. Herbicidal component (A) A-1: N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -3-methyl-5- (2-chloro-2,2-difluoroethoxy) -4-iso Thiazole sulfonamide A-2: methyl-α- (4,6-dimethoxypyrimidine-2
-Ylcarbamoylsulfamoyl) -o-toluylate A-3: 3,7-dichloro-8-quinolinecarboxylic acid A-4: 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-phena Siloxypyrazole A-5: 2-methylthio 4,6-bis (ethylamino)-
s-Triazine surfactant (B) B-1: polyoxyethylene nonylphenyl ether 5
B-2: Polyoxyethylene alkyl aryl ether sulfate (trade name, Solpol 5039: manufactured by Toho Chemical Industry) B-3: Naphthalene sulfone Sodium acid formalin condensate (trade name, Labelin FAN: manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) Acidic substance (C) C-1: Succinic acid Foaming agent (D) D-1: Sodium bicarbonate D-2: Sodium carbonate Binder (E) E-1: Sodium carboxymethylcellulose (trade name, Serogen-PR: manufactured by Daiichi Kogyo Seiyaku) Solid carrier (F) F-1: Fine powder silica (trade name, Carplex: manufactured by Shionogi Pharmaceutical Co.) F-2: Ziglite Other (G) G-1: Dye (trade name, Food Blue No. 1 (Brilliant Blue FCF): Use of reagent (Tokyo Kasei))

Formulation Examples I-a- (A) 42.4 parts of C-1 5.2 parts of E-1 D-13
1.4 parts and 21.0 parts of D-2 were uniformly mixed and pulverized to obtain a blend. 0.46% of A-1 and 3.34% of A-3 previously crushed to a particle size of about 5 to 10 μm in a mortar and B
-13.8% and 92.4% of the blend were mixed and pulverized with a micro sample mill (AP-S type, manufactured by Hosokawa Industries) to obtain a pulverized product. 48.2 g of this pulverized material was compression-molded for 2 minutes at a pressure of 150 to 160 kg / cm ² using a tableting machine, and one tablet (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm was obtained.
g) was obtained.

Formulation Example I-a- (B) Dye G-1 was added to the mixture of Preparation Example I-a- (A) before pulverization.
Was added except that approximately 2% of the total weight was added.
In the same manner as in the case of (A), 38.6 g of the pulverized product was used for a tablet having a diameter of 5 cm and a thickness of 1.3 cm (38.4 g) using a tableting machine.
I got Formulation Example I-b Formulation Example I-a- (B) is the same as that of Formulation Example I-a- (B), except that the composition has a composition of 5.2 parts of E-1, 73.8 parts of D-1 and 21.0 parts of D-2. In the same manner as described above, 38.6 g of the pulverized product was compression-molded using a tableting machine to obtain one tablet (38.4 g) having a diameter of 5 cm and a thickness of 1.6 cm.

Formulation Example Ic 38.08% of a formulation having the same composition as the formulation of Formulation Example Ia- (A), 30.96% of A-4 and B-1
Preparation Example a except that 30.96% was mixed and pulverized
-In the same manner as in the case of (B), use a tableting machine to
8.6 g was compression molded to obtain one tablet (38.4 g) having a diameter of 5 cm and a thickness of 1.6 cm.

Formulation Example (a) The same procedure as in Formulation Example (a) (A) was carried out, and 10.7 g of the pulverized product was compression-molded using a tableting machine.
One tablet (10.5 g) having a size of 5 cm and a thickness of 0.8 cm was obtained.

Formulation Example ae In the above Formulation Example aa- (A), 1.2 parts of A-1
A-3 8.8 parts, B-2 3.0 parts, B-3 2.0
Part A, 36.9% of a wettable powder consisting of 6 parts of F-1 and 79.0 parts of F-2, and 62.1% of the blend, and in the same manner as in the case of Formulation Example Ia- (A). 10.7 g of the product pulverized using a tableting machine was compression molded to a diameter of 2.5
One tablet (10.5 g) having a size of 0.8 cm and a thickness of 0.8 cm was obtained.

Formulation Example (i) The same procedure as in Formulation Example (e) was carried out and crushed to obtain one tablet (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm from 48.2 g. .

Formulation Example ag In the above Formulation Example aa- (A), A-2 0.52%
Using 3.33% of A-3, 3.85% of B-1 and 92.3% of the blend, the same procedure as in Formulation Example I-a- (A) was carried out. Obtained one tablet (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm.

Formulation Example ah 1.35 parts of A-2 in Preparation Example Aa- (A),
A-3 8.65 parts, B-2 3.0 parts, B-3 2.
In the case of Formulation Example i-a- (A), using 38.53% of a wettable powder consisting of 0 parts, 6.0 parts of F-1 and 79.0 parts of F-2 and 61.47% of the blend. The procedure was carried out in the same manner as described above to obtain one tablet (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm from 48.2 g of the pulverized product.

Formulation Example ai In the above Formulation Example a- (A), A-1 0.455%,
A-3 3.34%, A-5 1.53%, B-1
Using 5.33% and 89.36% of the above blend, the same procedure as in Preparation Example I-a- (A) was carried out.
One tablet (48.0) having a diameter of 5 cm and a thickness of 1.6 cm from 2 g
g) was obtained.

Formulation Example aj 0.81 part of A-1 in the above Formulation Example aa- (A),
A-3 6.27 parts, A-5 2.87 parts, B-2
3.0 parts, B-3 2.0 parts, F-1 6.0 parts and F
-Performed in the same manner as in Formulation Example I-a- (A) using 53.19% of a wettable powder consisting of 79.0 parts and 46.81% of the blend, and 48.2 g of a pulverized product From diameter 5c
One tablet (48.0 g) having a thickness of 1.6 cm and a thickness of 1.6 cm was obtained.

Example B (Dispersibility test-I) As an obstacle, water was poured into a 3.5 m radius concrete circular pool (FIG. 1) having a 0.5 m radius column at the center of the circle at a depth of about 5 cm. Was. As shown in FIG.
The tablet prepared in the above formulation example is put into the W-1 point 75 m away from the center, and after a predetermined time elapses, 0.75 m, 1.75 m from the center of the circle
Alternatively, water was collected at each point at a distance of 2.75 m, and the state of dispersion of the herbicidal components was investigated.

[0033]

[Table 1]

[0034]

[Table 2]

(Ii) At 19 hours after administration, no tablet precipitate was observed at the point of W-1.

Example C (Dispersibility test-II) The same test group as the test group of Example E (herbicidal test-II) described later was used. A test section having a width of 8 m and a length of 6 m was provided as one section in the paddy field that was scraped, and water was poured to a depth of 3 to 6 cm.
Nine days after scratching, one tablet (W-1 point in FIG. 2) or two tablets (W-2 in FIG.
And W-3). Each tablet of 2 applications goes through the same formulation method as that of 1 application, but the thickness is 1/2
It is. Twenty-four hours later, at each of the points W-1, X and Y, field water was sampled and the state of dispersion of the herbicidal components was examined. Many obstacles such as straw chips and weed fragments were observed in the paddy fields.

[0037]

[Table 3]

Example D (Weeding Test-I) After cultivating a paddy field with a tractor on June 7, 20 kg of a granular compound fertilizer (NP ₂ O ₅ -K: 14-10-13) per 10 a was used as a base fertilizer. gave. Water was entered on June 12, two days later, the tractor was used for scratching, and two-leaf seedlings (variety: Nipponbare) that had been box-raised on June 16 were mechanically transplanted. On June 20, a 3.5 mx 3 m test plot was established using plastic levee sheets in a two-unit system. The next day, three tubers of germinated horned beetle were planted at the end of the test plot per plot. Other weeds were spontaneously generated, but all were high. Flooding depth 5
It was adjusted to 7 cm, and one tablet prepared in the above formulation example was thrown on the center of the test plot on June 26. In the comparative group, granules according to the conventional formulation method were uniformly applied, corresponding to the tablets.
The chemicals are 0.45 g / a for herbicidal component A-1 and 3 g for A-3.
/ A. The leaf age of each weed at the time of chemical treatment was 1.
The fireflies, azaleas and Spodoptera crickets were at the 1.5 to 2 leaf stage at the 5-1.8 leaf stage. On the 45th day after the chemical treatment, the growth status of paddy rice and weeds was visually observed, and the degree of growth inhibition was represented by the following criteria, and the results in Table 4 were obtained.

The growth inhibition of about 5: 100% t: 96~99% 5- 4: 91~95% 5-4: 85~90% 4-5: 81~84% 4: 70~80%

[0040]

[Table 4]

Example E (Weeding Test-II) A paddy field was plowed with a tractor on July 17 and water was introduced on July 21. The next day, a tractor was used to set up an 8m x 6m test plot using a plastic ridge sheet. 24 tubers of Spruce cricket germinated on July 24 per plot
The plant was planted at the position indicated by the point x. Millet and pupa were naturally generated. On July 31, the flood depth was adjusted to 3 to 6 cm, and one or two tablets prepared in the above formulation example were placed in each position of W-1 or W-2, W-3 in FIG. I threw it. The weeds at the time of the chemical treatment were 1.5 to 2 leaf stage for barnyardgrass and oak, and 2 leaf stage for Spodoptera cricket. On the 30th day after the chemical treatment, the degree of growth inhibition was determined in the same manner as in Example 2 above, and the results shown in Table 5 were obtained.

[0042]

[Table 5]

[0043]

EFFECT OF THE INVENTION By applying the composition of the present invention as a tablet or a capsule to a flooded paddy field, the herbicidal component can be rapidly dissolved in the flooded paddy field, and at the same time, dispersal or diffusion can be achieved. be able to. The tablet and capsule of the present invention can obtain a herbicidal action simply by throwing it from a ridge into a paddy field, greatly reducing the burden on labor, further reducing the time required for application, and greatly improving work efficiency. In addition, transportation and storage are simplified. Also,
By dispersing or diffusing the active ingredient over a wide area such as the entire paddy field, while avoiding local residue and phytotoxicity at the drug injection section,
A stable herbicidal effect can be obtained.

[Brief description of the drawings]

FIG. 1 shows a concrete circular pool;
A radius of 0.5 m of the center of the circle is a cylinder protruding above the water surface.
-1 point is the input point of the tablet, W-1 ~ 3, X-1 ~
3, points of Y-1 to 3 and Z-1 to 3 are water sampling points.

FIG. 2 shows a paddy field, W-1 to 3 are input points of tablets, and W-1, X and Y are sampling points of water.

FIG. 3 shows a paddy field, where W-1, W-2 and W-3 are tablet input points, and a point X is a planting point of a water flies.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Maeda, 2-3-1 Nishi-Shibukawa, Kusatsu-shi, Shiga Prefecture Central Research Laboratory, Ishihara Sangyo Co., Ltd. (72) Mikio Miyaji 2-chome, Nishi-Shibukawa, Kusatsu-shi, Shiga No.3-1 Ishihara Sangyo Co., Ltd. Central Research Laboratory (72) Inventor Akira Nakagawa 2-3-1 Nishi-Shibukawa, Kusatsu-shi, Shiga Prefecture Ishihara Sangyo Co., Ltd. Central Research Laboratory (72) Inventor Noboru Yoshikawa Kusatsu-shi, Shiga 2-3-1 Nishi-Shibukawa Ishihara Sangyo Co., Ltd. Central Research Laboratory (56) References JP-A-57-163303 (JP, A) JP-A-4-226901 (JP, A) JP-A-60-42313 ( JP, A) JP-A-53-99327 (JP, A) JP-A-1-211504 (JP, A) JP-B-47-2930 (JP, B1) JP-B-51-46816 (JP, B1) (58) ) investigated the field (Int.Cl. ^7, B name) A01N 25/34 A01N 43/42 A01N 43/56 A01N 43/70 A01N 47/36

Claims (4)

(57) [Claims] The present invention relates to a tablet for paddy field herbicide applied directly to a flooded sewage paddy field, wherein it is assumed that the entire amount of the drug is dissolved in the field water when applied to the flooded sewage paddy field. A paddy field herbicidal tablet comprising a herbicidal component having a solubility of not more than 25 ° C. in water of the herbicidal component, a surfactant and a binder. 2. The herbicidal component is N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -3-methyl-5- (2-chloro-2,2-difluoroethoxy-4-).
Isothiazolesulfonamide, methyl-α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluylate, N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4 -Ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide, N- (2-chloroimidazo [1,2-a] pyridine-3
-Ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) urea, 3- (4,6-dimethoxy-1,3,5-
Triazin-2-yl) -1- [2- (2-methoxyethoxy) -phenylsulfonyl] urea, 2-methylthio-4,6-bis (ethylamino) -s-triazine,
-Methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine, 3,7-dichloro-
8-quinolinecarboxylic acid, 2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide, 2-
Chloro-2 ', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-benzothiazol-2-yloxy-N-methylacetanilide, N- [2'-(3'-methoxy) -thienylmethyl] -N -Chloroaceto-2,6-dimethylanilide, 2 ', 6'-diethyl-N-[(2-cis-
Butenooxy) methyl] -2-chloroacetanilide,
Exo-1-methyl-4- (1-methylethyl) -2- (2
-Methylphenyl) methoxy-7-oxabicyclo [2,
2,1] heptane, S, S-dimethyl-2-difluoromethyl-4- (2-methylpropyl) -6- (trifluoromethyl) -3,5-pyridinedicarbothioate and 2-
The tablet for paddy field herbicide according to claim 1, which is at least one or more selected from the group consisting of (3,5-dichlorophenyl) -2- (2,2,2-trichloroethyl) oxirane. 3. A paddy field weeding method, characterized by directly applying the tablet of claim 1 or 2 to a paddy field flooded with water. 4. The tablet is prepared by adding 10 to 2 tablets per 10 ares.
The method according to claim 3, wherein the paddy field is directly applied to a paddy field flooded so as to have a total weight of 200 to 1500 g.