JP3215683B2 - Tablets or capsules for paddy weeding - 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 drug, and even more uniform drug spraying is still required. You need to walk around rice fields.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional methods, and enables weeding of paddy fields by a simple method without using a special chemical sprayer. That is, the present invention relates to a paddy field herbicidal tablet or capsule containing a sulfonylurea-based herbicidal component in which the total amount of the drug applied to the paddy field is substantially dissolved in the field water, a surfactant, a foaming agent and a binder, The present invention relates to a paddy field herbicidal tablet or capsule containing a paddy field in which the total amount of the drug applied is substantially soluble in the rice field and to which other herbicidal components are added. In addition, the present invention relates to the tablet or capsule is 10-20 per 10 ares
0 and the total weight of the tablets or capsules is 200 to 15
The present invention relates to a paddy field weeding method which is applied to a paddy field flooded so as to be 00 g and dissolves and disperses substantially all of the herbicidal components in the field water.

[0005] The present invention provides: [1] A paddy field characterized in that the total amount of the drug applied to the paddy field contains a sulfonylurea-based herbicidal component, a surfactant, a foaming agent, and a binder which are substantially dissolved in the field water. Tablet or capsule for herbicidal use; [2] capsules comprising: (1) the herbicidal component, a surfactant,
[3] The tablet or capsule for paddy field herbicide according to the above [1], wherein any one of a mixed and crushed product of a foaming agent and a binder or (2) granules obtained by granulating the mixed and crushed product is wrapped with a water-soluble film. The tablet is (1) a tablet obtained by tableting and molding the mixed and ground product of the herbicidal component, surfactant, foaming agent and binder.
[4] The tablet or capsule according to [1], wherein the tablet or capsule contains other herbicidal components in which the total amount of the drug applied to the paddy field substantially dissolves in the paddy water. ] The tablet or capsule for paddy field herbicide according to any one of [3] to [3]; and [5] 10 to 200 paddy field weeding tablets or capsules per 10 ares, and the total weight of the tablet or capsule is 2
Apply to paddy field flooded so that it becomes 00-1500 g,
The tablet or capsule for paddy field herbicide according to any one of the above [1] to [4], wherein substantially all of the herbicidal component can be dissolved and dispersed in the tap water.

In another aspect, the present invention provides: [6] applying the tablet or capsule for paddy field herbicide according to any one of the above [1] to [4] to a flooded paddy field to substantially remove the herbicidal substance. Paddy field herbicidal method characterized by dissolving and dispersing the whole amount of the components in tap water; [7] 10 to 200 paddy field herbicidal tablets or capsules per 10 ares, and the total weight of the tablets or capsules is 2
Apply to paddy field flooded so that it becomes 00-1500 g,
The method according to the above [6], wherein substantially all of the herbicidal components are dissolved and dispersed in the water; [8] The method wherein the tablet or capsule for paddy herbicide is directly applied to a flooded paddy field. Characteristic [6] or [7]
The method described in;

[9] The method according to any one of the above [6] to [8], which is weeding in an early to middle stage of paddy rice cultivation.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A sulfonylurea-based herbicidal component or other herbicidal component specified in the present invention that "the entire amount of a drug applied to a paddy field is substantially dissolved in paddy water" is substantially harmful to rice seedlings. If the herbicidal component is applied to a paddy field without giving a sufficient amount of herbicidal effect, that is, a practical amount of herbicide, and the total amount of the herbicidal component dissolves in the paddy water, the concentration of the herbicidal component in the paddy field is equal to the water content of the herbicidal component. Means a herbicidal component having a solubility in water (25 ° C.) or less. For example, methyl-2- (4,6-
Dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluylate (hereinafter abbreviated as A-2) is
5 to 7.5 g of herbicide in the early to middle stage of rice cultivation is usually applied per 10 ares, and the concentration in rice field is 0.1 to 0.15 ppm (practical amount) assuming a flooding depth of 5 cm. Since its solubility in water (25 ° C.) is 8 ppm, it corresponds to the sulfonylurea herbicidal component specified in the present invention.

On the other hand, the herbicidal component 4- (2,4-dichlorobenzoyl) -1,3-, which has recently been put to practical use as a paddy field herbicide.
Dimethyl-5-phenacyloxypyrazole (hereinafter abbreviated as pyrazoxifene) is generally applied in a range of 180 to 300 g per 10 ares as a practical herbicide for paddy rice in the early to middle stages, and its concentration in paddy water at a depth of 5 cm of water is 3.6 to 6 ppm.
(Practical drug amount), and the solubility in water (25 ° C) is 0.9.
Since it is ppm, it does not fall under the other herbicidal components specified in the present invention. This means that the herbicidal component A-2 has a lower content than pyrazoxifen, so that it can be easily formulated into the tablet or capsule of the present invention. Because of its high solubility, it dissolves quickly in water and diffuses widely, dispersing it evenly, whereas pyrazoxifene hardly dissolves and is difficult to disperse.
It shows that it settles to the bottom of the water in a solid state.

Specific examples of the sulfonylurea herbicidal component include, for example, N-[(4,6-dimethoxypyrimidine-
2-yl) aminocarbonyl] -3-methyl-5- (2
-Chloro-2,2-difluoroethoxy-4-isothiazolesulfonamide (hereinafter abbreviated as 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-
Pyrazole sulfonamide (hereinafter abbreviated as A-3), N-
(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl) -N '-(4,6-dimethoxy-2-pyrimidinyl) urea (hereinafter abbreviated as A-4) and 3- (4,6 -Dimethoxy-1,3,5-triazin-2-yl) -1- [2-
(2-methoxyethoxy) -phenylsulfonyl] urea (hereinafter abbreviated as A-5).

Other herbicidal components include 2-methylthio-4,6-bis (ethylamino) -s-triazine (hereinafter abbreviated as B-1), 2-methylthio-4-ethylamino-
Triazines such as 6- (1,2-dimethylpropylamino) -s-triazine (hereinafter abbreviated as B-2); such as 3,7-dichloro-8-quinolinecarboxylic acid (hereinafter abbreviated as B-3) Quinolinecarboxylic acids; 2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide (hereinafter abbreviated as B-4), N- [2'-(3'-methoxy)-
Thienylmethyl] -N-chloroaceto-2,6-dimethylanilide (hereinafter abbreviated as B-5), 2 ', 6'-diethyl-N
Anilides such as-[(2-cis-butenooxy) methyl] -2-chloroacetanilide (hereinafter abbreviated as B-6); S, S-dimethyl-2-difluoromethyl-4-
(2-methylpropyl) -6- (trifluoromethyl)
-3,5-pyridinedicarbothioate (hereinafter abbreviated as B-7), but triazines and quinoline carboxylic acids are preferable in consideration of solubility in water, action on rice and weeds. .

The surfactant in the present invention comprises a herbicidal component,
It imparts hydrophilicity to a binder or the like, for example, sodium dodecylbenzenesulfonate, dialkylsulfosuccinate, sodium dialkylsulfosuccinate, sodium lauryl sulfate, higher alcohol sodium sulfate, lignin sulfonate, polyoxyethylene alkyl aryl ether Sulfate, β-
Anionic surfactants such as sodium naphthalene sulphonate formalin condensate, dinaphthalene methanesulfonate, alkylarylsulfonate, sodium alkylarylsulfonate and sodium alkylnaphthalenesulfonate: polyoxyethylene nonylphenyl ether, polyoxyethylene oleyl ether, Polyoxyethylene oleate, polyoxyethylene alkylaryl ether, polyoxyethylene alkyl ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene fatty acid ester, polyoxyethylene styrylphenyl ether, sorbitan monooleate, sorbitan monolaurate, Sorbitan monostearate, sorbitan sesquioleate, sorbitan palmitate, acetyl Glycol, nonionic surfactants such as diglycerol Bora Tomono stearate and the like. 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.

It has also been found that the use of a specific surfactant in the tablet or capsule preparation of the present invention suppresses the decomposition of the sulfonylurea compound, which is the main herbicidal component. Examples of the specific surfactant include those having no oxyalkylene group such as oxyethylene group and oxypropylene group in its structure, such as polyoxyethylene alkyl aryl ether sulfate and polyoxyethylene group. Other than oxyethylene nonylphenyl ether. Furthermore, even a surfactant containing an oxyalkylene group, as long as it does not promote decomposition of the sulfonylurea-based herbicidal component,
You may use together with another surfactant within the quantitative range.

[0013] The blowing agent in the present invention is a combination of an acidic substance and an alkaline substance which react in the presence of water to generate gas. As the acidic substance, the substance itself is acidic or dissolved in water and exhibits acidic properties, such as citric acid, tartaric acid, oxalic acid, succinic acid, maleic acid, phthalic acid, malic acid, and adipic acid. Organic acids; hydrogen salts such as sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, and potassium hydrogen sulfate; alums such as potassium alum and ammonium alum; and the like. Examples thereof include carbonates such as sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, and ammonium carbonate; bicarbonates such as sodium bicarbonate and potassium bicarbonate; and percarbonates such as sodium percarbonate.

The binder used in the present invention binds each component particle, and may be any one which is preferably water-soluble. Examples thereof include carboxymethylcellulose, salts thereof, dextrin, and polyethylene glycol. , Polyvinyl alcohol, polyalkylene glycol, lignin sulfonate, gum arabic, starch paste, other starches, sucrose and the like. Further, as the binder in the present invention, even if the binder itself is not a general binder, any binder can be used as long as it plays a role of binding each component particle. Examples of substances that can be used in this way include acidic substances such as stearic acid, succinic acid, adipic acid, and phosphoric acid and salts thereof; and alkaline substances such as sodium carbonate and sodium bicarbonate.

Some binders, such as the above-mentioned surfactants, suppress the decomposition of the sulfonylurea-based herbicidal components. Examples of such a compound include compounds other than compounds having an oxyalkylene group, such as polyethylene glycol, polyvinyl alcohol, and polyalkylene glycol. However, the above-mentioned binder may be used within the quantitative range as long as it does not promote the decomposition of the sulfonylurea-based herbicidal component.

Since the selection of the surfactant, the foaming agent and the binder varies depending on the kind of the herbicidal component and the blending ratio of the whole preparation, an appropriate one must be actually selected by trial and error experiments.

The tablet or capsule for paddy field weeding of the present invention comprises:
The sulfonylurea-based herbicidal component, a surfactant, a foaming agent and a binder, and further, those containing the other herbicidal components added thereto, for example, 1 part by weight of the sulfonylurea-based herbicidal component 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, more preferably 1 to 5 parts by weight of the surfactant, and 1 to 8 parts by weight of the foaming agent.
00 parts by weight, preferably 5 to 100 parts by weight, more preferably 5 to 25 parts by weight, and 0.1 to 20 parts by weight of the binder, preferably 0.2 to 10 parts by weight, more preferably
It is contained in a ratio of 0.4 to 1.5 parts by weight. Also,
Other herbicidal components may be added in an amount of 0.5 to 100 parts by weight based on 1 part by weight of the sulfonylurea-based herbicidal component. In this case, the mixing ratio of the surfactant, the foaming agent, and the binder to all the herbicidal components is in the range described above. It is needless to say that a material outside the above range is included in the present invention as long as the initial effect is exhibited.

The tablet or capsule of the present invention may contain a solid carrier and other agricultural chemical auxiliaries in addition to the above-mentioned components.
In addition, the solubility of the herbicidal component in water as defined in the present invention, as long as the herbicidal component other than the herbicidal component of the present invention is not significantly impaired, a herbicidal component, a bactericidal component, an insecticidal component, a plant growth regulating component, a fertilizer component, etc. It can also be contained. Examples of the solid carrier include mineral fine powders such as kaolin, talc, clay, bentonite, and finely divided silica; inorganic salts such as anhydrous sodium sulfate; and organic substances such as urea. Usually used as other agricultural chemical auxiliaries. Solvents, decomposition inhibitors, safeners, dispersion stabilizers, disintegrants, desiccants and the like. Their use amounts cannot be unequivocally defined, but generally 0.1 to 50 parts by weight of the solid carrier as a percentage of the whole tablet or capsule and other pesticide auxiliaries
0.1 to 20 parts by weight.

The tablet or capsule of the present invention is usually easily produced by the following method or a method analogous thereto. In general, when the herbicidal component is a solid, the particle size is 1 to 4 by pulverizing in advance to enhance solubility and dispersibility in water.
It is used as fine particles of 200 μ, preferably 1 to 100 μ.

As a method for producing a tablet, for example, the herbicidal component, the surfactant, the foaming agent, and the binder are mixed simultaneously, or the remaining components are mixed with any of the premixed components, so that all the components are made uniform. Mix, particle size 1-200μ
Into a tablet by compression molding using a tableting machine according to an ordinary method. When using a solid carrier or other pesticide auxiliaries here, a method in which this is uniformly mixed with a herbicidal component and a surfactant in advance, crushed to form a wettable powder, and then mixed with a foaming agent and a binder. Is mentioned. 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 circular plates, oval plates, square plates, and rods, 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 circular plate, the size is 1 to 5 cm in diameter, and the thickness is 0.2 to 3 cm. And those weighing 1 to 150 g are preferable in terms of formulation and drug application.

The method for producing the capsule of the present invention includes, for example, uniformly mixing a herbicidal component, a surfactant, a foaming agent and a binder, and adding a solid carrier or other pesticide auxiliaries, if necessary, to uniformly mix them. The mixed and pulverized pulverized material has a particle size of 1 μm to 1.
The granules are granulated to 5 mm, and the granules are filled in capsules made of water-soluble cellulose, gelatin, or the like, or the granules and wettable powder are filled as they are without granulation. This capsule may have the same shape as that of the tablet, and may be any of a spherical shape, an elliptical spherical shape, a size and a weight. However, the shape is an elliptical spherical shape and the size is 1 to 5 cm in diameter and 1 to 10 cm in length. Those having a weight of 1 to 150 g are preferred. In addition to the capsules prepared as described above, the capsules of the present invention also include those in which the above-mentioned pulverized product or wettable powder is not filled in a capsule container but is wrapped as it is in a water-soluble film such as water-soluble cellulose or gelatin.

When the tablet or capsule of the present invention is applied to a flooded paddy field, gas is generated upon contact with water, the herbicidal component is rapidly eluted into the field water, and a surfactant also acts to remove the herbicide. The components diffuse into the water and disperse uniformly. Thus, when the tablet or capsule of the present invention is administered to a paddy field, substantially the entire amount of the herbicidal component can be rapidly dissolved and dispersed in the field water, and for example, the herbicidal component is uniformly distributed in the field water after several hours to 20 hours. Therefore, weeds can be uniformly controlled without damaging the rice.

In the case of weeding paddy fields using the tablets or capsules of the present invention, application is performed so that 10 to 200 are per 10 ares and the total weight of tablets or capsules is 200 to 1500 g. Then medicinal effect,
It is not desirable in terms of phytotoxicity, or requires a great deal of labor for spraying. Desirable application methods cannot be specified unconditionally due to differences in tablet or capsule production methods, sizes, herbicidal ingredients, surfactants, foaming agents, binders and other additives, and the proportions of such additives. Herbicidal component 5
150 g is divided into 0.05 to 15 g portions per tablet or capsule, and 10 to 100 portions are applied. Thus, tablets or capsules may be applied to one tablet every ¹⁰ to 100 m ² ,
Therefore, since it is only necessary to throw into the paddy field of the area from the ridge without entering the paddy field, the spraying operation is simple, which is advantageous as compared with the conventional drug application method.

When weeding a paddy field using the tablet or capsule of the present invention, generally, in the case of transplanted rice, seedling transplantation is performed.
In the case of direct sowing rice, the most favorable effect is obtained when applied to the early to middle stage of paddy rice cultivation 10 to 20 days after sowing, but even if the tablets or capsules are applied, there is no particular problem in terms of medicinal effect 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.

[0025]

Examples Examples of the present invention will be described, but the present invention is not limited by these descriptions. In the following examples, "parts" are expressed on a weight basis.

(Preparation of effervescent compound) Preparation Example 1 42.4 parts of succinic acid, sodium carboxymethylcellulose (trade name; Cellogen PR, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
5.2 parts, 31.4 parts of sodium bicarbonate and 21.0 parts of sodium carbonate are mixed uniformly, and then mixed with a micro sample mill (AP-S type,
(Hosokawa Industry Co., Ltd.) to obtain a foamable compound A.

Preparation Example 2 In the above Preparation Example 1, the mixture before pulverization was further added with a pigment (trade name: Food Blue No. 1, Brilliant Blue FCF,
0.5 part of Tokyo Kasei Co., Ltd.) was mixed uniformly, and foamable compound B was obtained in the same manner as in Preparation Example 1 above.

(Preparation of Tablets A to P and Comparative Tablets (a) to (g)) Formulation Example 1 Herbicidal component A previously ground to a particle size of about 5 to 10 μm in a mortar.
-1 0.46 part and other herbicidal component B-3 3.34 part, mixture of polyoxyethylene nonyl phenyl ether 50% and fine powder silica 50% (trade name: Dixsol W-
92, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and 92.4 parts of the effervescent compound A were mixed and pulverized with a micro sample mill (same as above) to obtain a pulverized product. 48.2 g of this crushed material
Was compressed using a tableting machine at a pressure of 150 to 160 kg / cm ² for 2 minutes to obtain a tablet A (48.0 mm) having a diameter of 5 cm and a thickness of 1.6 cm.
g) was obtained.

Formulation Example 2 Dyes (edible blue No. 1,
In the same manner as in Preparation Example 1 except that about 2% of the total weight of the above was added, 38.6 g of the crushed product was converted into a tablet B (38.4 g) having a diameter of 5 cm and a thickness of 1.3 cm using a tableting machine. Obtained.

Formulation Example 3 In the same manner as in Formulation Example 1, 10.7 g of the pulverized material was compression-molded using a tableting machine to form a diameter of 2.5 cm and a thickness of 0.8 cm.
Tablet C (10.5 g) was obtained.

Formulation Example 4 In Formulation Example 1, 1.2 parts of herbicidal component A-1 and 8.8 parts of other herbicidal component B-3 were mixed with polyoxyethylene alkyl aryl ether sulfate (trade name: Solpol 50).
39, manufactured by Toho Chemical Industry Co., Ltd.) 3.0 parts, sodium naphthalenesulfonate formalin condensate (trade name: Labelin F)
AN, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), 2.0 parts, fine powdered silica (trade name: Carplex, manufactured by Shionogi & Co., Ltd.), 6 parts, and a mixed and ground product of kaolinite and sericite (trade name: Sigrite) Pulverized in the same manner as in Preparation Example 1 using 37.9 parts of a wettable powder consisting of 79.0 parts and 62.1 parts of the effervescent compound A.
g, compression molded using a tableting machine, diameter 2.5 cm, thickness
0.8 cm of tablet D (10.5 g) was obtained.

Formulation Example 5 Pulverized in the same manner as in Formulation Example 4 48.2 g
Gave a tablet E (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm.

Formulation Example 6 In Formulation Example 1, 0.52 parts of the herbicidal component A-2, 3.33 parts of the other herbicidal component B-3, 3.85 parts of Dixsol W-92 (same as above), and 92.3 parts of the foaming composition A were used. In the same manner as in Preparation Example 1, a tablet F (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm was obtained from 48.2 g of the pulverized product.

Formulation Example 7 In Formulation Example 1, 1.35 parts of herbicidal component A-2, 8.65 parts of other herbicidal component B-3, and 3.0 of Solpol 5039 (same as above)
The above formulation was prepared by using 38.53 parts of a wettable powder consisting of 2.0 parts of Labelin FAN (same as above), 6.0 parts of carplex (same as above) and 79.0 parts of siegrite (same as above) and 61.47 parts of the effervescent composition A. In the same manner as in Example 1, pulverized material 48.2 g
Gave a tablet G (48.0 g) having a diameter of 5 cm and a thickness of 1.6 cm.

Formulation Example 8 Herbicidal component A-1 0.455 parts, other herbicidal component B-3 3.34 parts, other herbicidal component B-1 1.53
Parts, Dixsol W-92 (same as above), 5.33 parts and 89.36 parts of the foamable composition A, and in the same manner as in Preparation Example 1, from 48.2 g of the pulverized product, a diameter of 5 cm and a thickness of 1.6
cm tablet H (48.0 g) was obtained.

Formulation Example 9 In Formulation Example 1, 0.85 parts of herbicidal component A-1, 6.27 parts of other herbicidal component B-3, and 2.87 parts of other herbicidal component B-1
Department, Solpol 5039 (same as above) 3.0 parts, Labelin FAN
Using 53.19 parts of a wettable powder consisting of 2.0 parts (the same as above), 6.0 parts of a carplex (the same as above), and 79.0 parts of Sigleite (the same as above) and 46.81 parts of the effervescent compound A, Similarly, from 48.2 g of ground material, 5 cm in diameter and thickness
A 1.6 cm tablet I (48.0 g) was obtained.

Comparative Preparation Example 1 38.08 parts of the effervescent compound A, pyrazoxyfen 30.96
Part and Dixsol W-92 (the same as above) were mixed and crushed, except that 38.6 g of the crushed product was compression-molded using a tableting machine in the same manner as in Preparation Example 2 except that the mixture was crushed.
A comparison tablet (a) (38.4 g) having a thickness of 1.6 cm was obtained.

Formulation Examples 10 to 14 and Comparative Formulation Examples 2 to 4 0.2 parts of herbicidal component A-3 previously ground in a mortar, 3.3 parts of other herbicidal component B-3, 3.5 parts of surfactant shown in Table 1 below Then, 88.0 parts of the foaming compound B and 5 parts of magnesium oxide were mixed and ground again to obtain a pulverized product. Using a tableting machine, 4.05 g of this pulverized product was pressured at 150 to 160 k.
g / cm ² for 2 minutes, 2cm in diameter, 0.8cm in thickness
Each tablet (4.0 g) was obtained.

[0039]

[Table 1]

Formulation Example 15 Herbicidal component A-3 0.21 part, other herbicidal component B-3 3.32
Parts, Sorgen 90 (same as above) 3.54 parts, magnesium oxide
5.00 parts, 0.44 part of a pigment (edible blue No. 1, same as above) and 87.49 parts of the foamable compound A were mixed and pulverized with a micro sample mill (same as above) to obtain a pulverized product. This crushed material
4.05 g was weighed using a tableting machine at a pressure of 150 to 160 kg / cm.
^The mixture was compression-molded for 2 minutes to obtain tablets O (4.0 g) having a diameter of 2 cm and a thickness of 0.8 cm.

Formulation Example 16 A tablet P having a diameter of 2 cm and a thickness of 0.8 cm was prepared in the same manner as in Formulation Example 15 except that Sorgen 90 (same as above) was replaced with Sorgen 50 (same as before). (4.0
g) was obtained.

Formulation Example 17: Herbicidal component A-3 0.22 part, which was previously ground in a mortar, 3.43 part of other herbicidal component B-3, 1.01 part of B-7, Sorgen 5
0 (same as above), 4.66 parts of magnesium oxide, 5.00 parts of magnesium oxide and 85.68 parts of the foaming compound B were mixed and ground again with a mortar to obtain a pulverized product. 4.05 g of this pulverized product was compression-molded for 2 minutes at a pressure of 150 to 160 kg / cm ² using a tableting machine to form a powder having a diameter of 2 kg.
A tablet Q (4.0 g) having a thickness of 0.8 cm and a thickness of 0.8 cm was obtained.

Formulation Example 18 In Formulation Example 17, the other herbicidal component B-7 was replaced with B-
5. Add 2.66 parts and 4.66 parts of Sorgen 50 (same as above) to 6.55
In the same manner as in Formulation Example 17 except that 85.68 parts of the foamable compound B and 81.90 parts of the effervescent compound B were used, a tablet R (4.0 g) having a diameter of 2 cm and a thickness of 0.8 cm was obtained.

Formulation Example 19 In Formulation Example 17, the other herbicidal component B-7 was replaced with B-
6. To 5.21 parts, 4.66 parts to 8.86
In the same manner as in Preparation Example 17, except that 85.68 parts of the foamable compound B were replaced with 77.28 parts, a tablet S (4.0 g) having a diameter of 2 cm and a thickness of 0.8 cm was obtained.

Test Example 1 (Dispersibility test-I) Radius having a 0.5 m radius column at the center of the circle as an obstacle
Approximately 5 water depths in a 3.5m concrete circular pool (Fig. 1)
Water was put in cm. As shown in Figure 1, 0.75 from the center of the circle
The tablet prepared in the above formulation example was applied at W-1 point away from the center by 0.75 m, 1.75 m from the center of the circle 4 hours after the application.
Water was collected at each point at a distance of m or 2.75 m, and the state of dispersion of the herbicidal components was investigated. The results are shown in Table 2 below.

[0046]

[Table 2]

(Note) 4 hours after application of the tablet, no tablet precipitate was observed in the present invention section in terms of W-1.
In contrast, a large amount of precipitate was observed on the water bottom. As can be seen from the above test results, it is difficult to uniformly disperse the herbicidal component pyrazoxifene in the contrast group, whereas in the present invention group, both the herbicidal components A-1 and B-3 are uniformly dispersed.

Test Example 2 (Dispersibility Test-II) A test plot having a width of 8 m and a length of 6 m was provided as a test plot in a paddy field that was scraped, and water was poured to a depth of 3 to 6 cm. Nine days after scratching, the tablets prepared in the above Formulation Examples were added to one tablet per test group.
(Point W-1 in FIG. 2). W- 24 hours later
At each point of 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.

[0049]

[Table 3]

(Note) In Test Nos. 5 and 6, the herbicidal component B was used.
-1 was not analyzed, and granules A and B corresponded to the tablets of Test Nos. 1 and 2 and Nos. 5 and 6, respectively, and were prepared by a conventional method. As can be seen from the above test results, the dispersibility of the herbicidal components A-1 and B-3 in the test plots Nos. 1, 2, 5 and 6 of the present plots was the same as the test plot of the comparative plot.
Since it is not inferior to or superior to Nos. 7 and 8, the result of sufficient uniform dispersion of the herbicidal component can be obtained only by mere injection.

[0051] After plowing water paddy field tractor in Test Example 3 (Herbicidal test -I) 6 July, granular compound fertilizer as basal _{(N-P 2 O 5 -K} : 14- 10-13) to 10a per 20 kg was applied. Water was entered on June 12, and two days later, the tractor was used for scratching and box seedlings were raised on June 16. 2
Leaf-stage seedlings (variety: Nihonbare) were mechanically transplanted. June 2
On day 0, a test area of 3.5 mx 3 m was set up in duplicate using plastic ridge sheets. The next day, three tubers of germinated horned beetle were planted at the end of the test plot per plot. Other weeds spontaneously emerged, but all occurred frequently. Inundation depth 5
It was adjusted to ７7 cm, and on June 26, one tablet prepared in the above formulation example was thrown into the center of the test plot. In the comparative group, granules prepared by a conventional preparation method were uniformly applied, corresponding to the tablets. The chemicals were 0.45 g / a for herbicidal component A-1 and 3 for B-3.
g / a. Leaf age of each weed at the time of chemical treatment is
The 1.5-1.8 leaf stage, the fireflies, the puppies, the azalea, and the horned beetle were at the 1.5-2 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.

[0052] growth inhibition about 5: 100% t: 96~99% 5- 4: 91~95% 5-4: 85~90% 4-5: 81~84% 4: 70~80%

[0053]

[Table 4]

As can be seen from the test results, the herbicidal effect equivalent to that in the control group can be obtained without damaging the paddy rice by simply throwing in the paddy rice.

Test Example 4 (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 Sap.
The plant was planted at the position indicated by the point x. Millet and pupa were naturally generated. On July 31, the depth of flooding 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 drug treatment were in the 1.5 to 2 leaf stage for barnyardgrass and corn, and in the 2 leaf stage for Spodoptera litura. On the 30th day after the chemical treatment, the degree of growth inhibition was determined in the same manner as in Test Example 3 above, and the results shown in Table 5 were obtained.

[0056]

[Table 5]

Test Example 5 (Aging test of drug substance) Tablets J to N prepared by the above-mentioned preparation method and comparative tablet (b)
To (d), use two samples each, set one as a standard sample, and seal the other in a laminate bag at 54 ° C.
And stored for 7 days to conduct an abuse test. The standard sample and a part of the sample after the abuse test were taken, and the content of the active ingredient in the sample was quantified by an internal standard method using liquid chromatography, and the time-dependent change rate (decomposition rate) was calculated by the following equation.

[0058]

Embedded image

Table 6 shows the results.

[0060]

[Table 6]

As can be seen from the above results, the surfactant containing no polyoxyethylene group can stabilize the sulfonylurea-based herbicidal component as compared with the surfactant containing a polyoxyethylene group.

Test Example 6 (Diffusion test) Each test section of a wooden frame having a length of 1 m, a width of 4 m and a height of 20 cm was provided.
Paddy soil was evenly spread on the bottom of the paddy, and the water depth was 5 cm after entering and scraping. As shown in FIG. 4 described later, the tablet O or P is put into one of the test plots at one end (point W) of the short side, and the central part (point X, a position 2 m from one end of the short side).
And the other end of the short side (point Y) at a predetermined time (3.
After 5 hours, 1 day, 2 days, 4 days and 6 days), the field water was collected and the state of dispersion (concentration: ppm) of the herbicidal components was examined. Table 7 shows the results.

[0063]

[Table 7]

[0064]

According to the tablet or capsule for paddy field weeding provided by the present invention, various weeds can be uniformly controlled by a simple method of simply throwing the paddy into the paddy field without using a special chemical sprayer. Can be.

[Brief description of the drawings]

FIG. 1 shows a concrete circular pool having a column projecting on the water surface with a radius of 0.5 m at the center of the circle, W-1 represents the tablet input point, and W-1 to X-3, X -1 to
3, Y-1 to 3 and Z-1 to 3 are diagrams showing sampling points of water, respectively.

FIG. 2 is a view showing a paddy field, where W-1 to 3 are tablet input points, and W-1, X and Y are tap water sampling points.

FIG. 3 shows paddy fields, W-1 and W-2.
And W-3 are the points of input of the tablets, and the point X is the point of implantation of the horned frog.

FIG. 4 shows a test section of a wooden frame having a length of 1 m, a width of 4 m, and a height of 20 cm.
The point is a diagram showing the sampling point of the water.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Maeda 2-3-1, Nishi-Shibukawa, Kusatsu-shi, Shiga Prefecture Inside the Central Research Laboratory, Ishihara Sangyo Co., Ltd. (72) Mikio Miyaji 2-chome, Nishi-Shibukawa, Kusatsu-shi, Shiga Prefecture 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-3-128301 (JP, A) JP-A-1-139582 (JP, A) JP-A-63-45201 ( JP, A) JP-A-62-263103 (JP, A) JP-A-62-169702 (JP, A) JP-A-51-88641 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) A01N 47/28 A01N 25/12 A01N 25/28

Claims (4)

(57) [Claims] 1. A flooded Underwater paddy directly applied to the paddy field herbicidal tablets or capsules, and the assumption that (1) at the time of application is the total amount of the posology dissolved in field water
The concentration of the herbicidal component in the water
Rice herbicide characterized by containing a sulfonylurea-based herbicidal component having a temperature of (25 ° C.) or less , (2) a surfactant containing no oxyalkylene group in the structure , (3) a foaming agent, and (4) a binder. Tablets or capsules. Wherein said capsule, (1) the herbicidal component, a surfactant, wrapped by a water-soluble film one of granules granulating a powdered mixture, or (2) ground mixture of blowing agent and a binder The capsule for paddy field weeding according to claim 1, which is a herbicide. Wherein the tablet or capsule, posology at the time of application
Assuming that the total amount of
When the water concentration is less than the solubility of the herbicidal component in water (25 ° C)
There other paddy field herbicidal tablet or capsule according to claim 1 or 2 containing a herbicidal components. 4. The tablet or capsule is 10 to 200 pieces per 10 ares and has a total weight of 200 to 1500 g.
Paddy herbicidal tablets or capsules according to any one of the claims 1 to 3 is for use facilities to be.