JPH06211610A - Herbicidal composition and tablet for paddy field - Google Patents

Abstract

PURPOSE:To obtain a herbicidal composition for paddy field having synergism and excellent in residual effects and a herbicidal tablet for paddy field enabling simple application of the composition. CONSTITUTION:The composition is obtained by combining (A) 1pt.wt. pyrazole- based compound selected from 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5- phenacyloxypyrazole, pyrazolate and benzofenap with (B) 0.02-2 pts.wt. compound effective for controlling Japanese millet which is a paddy field weed selected from 2-chloro-2',6'-diethyl-N-(2-propoxyethyl)acetanilide, mefenacet and dithiopropyl and (C) 0.004-0.2pt.wt. sulfonylurea-based compound of N-[(4,6- dimethoxypyrimidin-2-yl)aminocarbonyl]-4-ethoxycarbonyl-1-methyl-5- pyrazolesulfonic amide. The tablet is prepared by blending 6-36 pts.wt. component A, 0.4-24 pts.wt. component B and, 0.06-3 pts.wt. component C with 1-8 pts.wt. surfactant and 29-92.54 pts.wt. foaming agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field herbicidal composition having a synergistic action and an excellent residual effect, a paddy field herbicidal tablet capable of simple application of the composition, and a paddy field herbicidal method.

[0002]

2. Description of the Related Art JP-A-62-212309 and 62.
-292708 and Japanese Patent Laid-Open No. 3-24003 disclose two or three mixed herbicidal compositions as herbicides for paddy fields. These are specific herbicides according to the present invention. No description of the combination of components is found.

Further, Japanese Patent Laid-Open Nos. 3-128301, 3-173802 and 3-223203 disclose paddy field herbicidal tablets for the purpose of simple chemical application. , Those using the combination of the specific herbicidal components according to the present invention are not specifically described.

As described above, although many herbicides for paddy fields have been researched and developed, the emergence of more satisfactory herbicides having excellent herbicidal effects and labor-saving spraying work is desired. Has been done.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have conducted research to develop a herbicide having an excellent herbicidal effect, and that a paddy field herbicidal composition containing a specific herbicidal active ingredient described below gives phytotoxicity to rice. Not only, the herbicidal effect of the active ingredient single agent is not only additively obtained, but also synergistic herbicidal effect is exerted and rice water leaks after the chemical treatment, or rainfall continues to flow out (overflow). However, it was also found that the herbicidal effect does not decrease even if the low temperature continues and the generation of weeds continues for a long time, and that it has an excellent residual effect. Further, a study was conducted to easily apply the composition, and when the herbicidal active ingredient, the surfactant and the effervescent agent were mixed to form tablets, the spraying work was significantly saved without impairing the aforementioned effects. And completed the present invention.

That is, the present invention relates to 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-phenacyloxypyrazole (general name: pyrazoxifene, hereinafter A-
1), 4- (2,4, dichlorobazoyl)-
1,3-Dimethylpyrazol-5-yl-p-toluenesulfonate (generic name: pyrazolate, hereinafter abbreviated as A-2) or 4- (2,4-dichloro-3-methylbenzoyl) -1,3-dimethyl- For controlling pyrethroid compounds (hereinafter abbreviated as compound A) selected from 5- (4-methylphenacyloxy) pyrazole (general name: benzophenap, hereinafter abbreviated as A-3) and paddy field weeds Effective 2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide (generic name: pretilachlor, hereinafter abbreviated as B-1), 2- (2-benzothiazolyloxy) -N -Methyl-N-phenylacetamide (generic name: mephenacet, hereinafter abbreviated as B-2) and S, S-dimethyl-2-difluoromethyl-4- (2-
Methylpropyl) -6- (trifluoromethyl) -3,
At least one compound (hereinafter abbreviated as compound B) selected from the group consisting of 5-pyridinedicarbothioate (generic name: dithiopyr, hereinafter abbreviated as B-3);
[(4,6-Dimethoxypyrimidin-2-yl) aminocarbonyl] -4-ethoxycarbonyl-1-methyl-
The present invention relates to a paddy field herbicidal composition (hereinafter simply referred to as a herbicidal composition), which comprises a combination of 5-pyrazolesulfonamide (generic name: pyrazosulfuron-ethyl, abbreviated as C-1 below) with a sulfonylurea compound. Further, a paddy field herbicide tablet (hereinafter simply referred to as a tablet) characterized by containing the above-mentioned herbicidal active ingredient, a surfactant and an effervescent agent, and the tablet is 10 to 200 per 10 ares.
The present invention relates to a paddy field weeding method in which a herbicidal active ingredient is dispersed in paddy water by applying to a paddy field flooded so that the total weight of the tablet becomes 500 to 1500 g.

The herbicidal composition of the present invention will be described below. The mixing ratio of the active ingredient of the herbicidal composition of the present invention can be within a relatively wide range, but usually 0.02 to 2 parts by weight, preferably 0. 03 to 1 part by weight, compound C-1 is 0.00
4 to 0.2 parts by weight, preferably 0.006 to 0.1 parts by weight.

The application rate of the herbicidal composition of the present invention varies depending on the mixing ratio of the active ingredients, the formulation form, the type of target weeds, the weather conditions, etc., and therefore cannot be specified unconditionally, but usually 90 to 180 g of Compound A per 10 ares, Desirably 120-180
g, compound B is 6 to 120 g, preferably 6 to 100
g, compound C-1 is 0.9 to 15 g, preferably 1.2
It is applied to give ~ 9 g. The herbicidal composition of the present invention is formulated in the same manner as in the case of conventional pesticides, especially paddy herbicides, but the following ones are most efficient and desirable for application. That is, it is a herbicidal method using the herbicidal composition of the present invention in the form of tablets, which will be described below.

The surfactant in the tablet of the present invention imparts hydrophilicity to herbicidal ingredients and the like, and fatty acid salts such as mixed fatty acid soda soap, castor oil potassium soap, and the like;
Alkyl sulfate ester salts such as sodium lauryl sulfate, higher alcohol sodium sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate; alcohol sulfate ester salts such as sodium alcohol sulfate ester; alkylbenzene sulfonate salts such as sodium dodecylbenzenesulfonate; Alkylnaphthalene sulfonates such as sodium alkylnaphthalene sulfonate; Alkyl sulfosuccinates such as sodium dioctyl sulfosuccinate; Alkyl diphenyl ether disulfonates such as sodium alkyl diphenyl ether disulfonate; Alkyl phosphates such as potassium alkyl phosphate Ester salt; polyoxyethylene lauryl ether sodium sulfate, polyoxyethylene alkyl ether Sodium sulfate, polyoxyethylene alkyl ether sulfate such as polyoxyethylene alkyl ether sulfuric acid triethanol amine;
Polyoxyethylene alkyl allyl ether sulfate ester salt such as sodium polyoxyethylene alkylphenyl ether sulfate; β-naphthalene sulfonic acid sodium salt formalin condensate, special aromatic sodium sulfonate sodium salt formalin condensate, naphthalene sulfonic acid formalin condensation Salt of a substance; polycarboxylic acid salt such as sodium polycarboxylate; polystyrene sulfonate; polyoxyethylene alkyl ether phosphate; anionic surfactant such as lignin sulfonate;

Of polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene higher alcohol ethers; polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether Such as polyoxyethylene alkyl allyl ether; polyoxyethylene styryl phenyl ether such as polyoxyethylene styryl allyl ether; polyoxyethylene
Oxyethylene / oxypropylene block polymers such as polyoxypropylene block polymers; sorbitan monolaurate, sorbitan monopalmylate, sorbitan monostearate, sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, sorbitan sesquioleate, Sorbitan fatty acid esters such as sorbitan distearate; polyoxyethylene sorbitan fatty acids such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan monooleate Esters; Glycerin fatty acid esters such as glycerol monostearate, glycerol monooleate; Poly Kishiechiren hydrogenated castor oil; polyoxyethylene glycerol stearic acid ester, polyoxyethylene glycerin fatty acid esters such as polyoxyethylene glycerin oleate; 2,
Acetylene glycols such as 4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol; 3-methyl-1-
Nonionic surfactants such as acetylene alcohol such as butyn-3-ol are mentioned, but when C-1 is decomposed in the preparation, the decomposition is suppressed by using a surfactant containing no oxyalkylene group. As such, the use of such surfactants is desirable.

As the surfactant containing no oxyalkylene group, for example, alkylbenzene sulfonate, alkyl sulfosuccinate, alkyl sulfosuccinate ester salt, alkyl sulfate, higher alcohol sulfate, lignin sulfonate, naphthalene sulfonate formalin are used. Examples thereof include salts of condensates, anionic surfactants such as alkylallyl sulfonates and alkylnaphthalene sulfonates; nonionic surfactants such as sorbitan fatty acid esters, acetylene glycol, and diglycerin borate monostearate.

These surfactants may be used either individually or as a mixture of two or more, or as a mixture of anionic and nonionic surfactants.
In addition, even a surfactant containing an oxyalkylene group can be used in combination within the quantitative range as long as it does not significantly accelerate the decomposition of the compound C-1.

The blowing agent in the present invention is a combination of an acidic substance and an alcal substance which reacts in the presence of water to generate a gas. Examples of the acidic substance include those which themselves exhibit acidity or which dissolve in water to exhibit acidity, and examples thereof include citric acid, tartaric acid, oxalic acid, succinic acid, maleic acid, phthalic acid, malic acid and adipic acid. Organic acids; hydrogen salts of sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, potassium hydrogen sulfate, and the like; alums such as potassium alum, ammonium alum, and the like. Examples of alkaline substances include 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.

In selecting the surfactant and the foaming agent, it depends on the kind of the herbicidal active ingredient and the blending ratio of the whole preparation, so that it is necessary to actually select an appropriate one by trial and error experiments. The compounding ratio of each component in the tablet of the present invention is 6 to 36 parts by weight, preferably 8 to 36 parts by weight of compound A and 0.4 to 24 parts of compound B, expressed in weight ratio based on the whole tablet. Parts by weight, preferably 0.4
To 20 parts by weight, compound C-1 is 0.06 to 3 parts by weight, preferably 0.08 to 1.8 parts by weight, surfactant is 1 to 8 parts by weight, and blowing agent is 29 parts by weight. ~ 92.54
Parts by weight. The foaming agent is usually prepared in a weight ratio of the acidic substance to the alkaline substance of 1: 2 to 2: 1. Of course, even those outside these ranges are included in the present invention as long as the desired effects are exhibited.

B as the herbicidal active ingredient contained in the present invention
Since -1 is an oily substance, if it is used as it is as a component of the tablet of the present invention and prepared, sufficient hardness may not be obtained or the oily substance may ooze out.
It is used by impregnating it with an oil absorbing carrier. As the oil-absorbing carrier that can be used here, any oil-absorbing carrier having an oil absorption of 50 wt% or more and having no adverse effect on the obtained tablet may be used. For example, finely powdered amorphous silicon dioxide (Product name: Carplex, Syloid, Nipseal, Tokuseal, Aerosil, etc.), Starch hydrolyzate (Product name: Pineflow, Paindex, etc.), Talc (Product name: LM-P, LM-R, High filler, etc.) ,
Diatomaceous earth (Brand name: Radiolite F, Radiolite SP
F, Celite SSC, Celite FIOSS, Ceratom M
W-23, Ceratom MW-25, Oplite), artificial compound of diatomaceous earth / lime (trade name: Microcell, etc.), World Cerabon, a mixture of kaolinite and sericite (trade name: Sieglite MC, etc.), silicic acid Calcium (product name: Torohero, etc.), light calcium carbonate (product name:
Toyostar TF-X, etc.), Silicate light calcium carbonate (trade name: Toyofine TF-X200, etc.), acid clay, powdered activated carbon, carbon black, natural earth graphite, perlite (pearlite) processed product (trade name: TOPCO Etc.), ultrafine particles of anhydrous aluminum oxide (trade name: aluminum oxide C, etc.), ultrafine particles of titanium oxide (trade name: titanium dioxide P25, etc.), basic magnesium carbonate, magnesium aluminate silicate (trade name: Neusilin, etc.) ),
Examples thereof include silica / alumina synthetic filler (trade name: Zeofil, etc.), hydrous magnesium silicate (trade name: Miraclay, etc.) and the like, and these may be mixed and used as necessary. The oil absorption amount here is JISK5101.
It was measured by.

When B-1 as the herbicidal active ingredient is impregnated in the oil-absorbing carrier, it can be mixed with a surfactant and impregnated if necessary. The ratio of the surfactant is 0.2 to 1 part by weight, preferably 0.4 to 0.7 part by weight, relative to 1 part by weight of the compound B-1. The surfactant mentioned here is the same as the above-mentioned one, but as the surfactant for emulsifying the compound B-1, particularly, for example, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene. Nonionic surfactants such as phenyl alkyl allyl ether sulfate, polyoxyethylene alkyl ether, polyoxyethylene hydrogenated castor oil, polyoxyethylene / polyoxypropylene block polymer, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester; alkyl allyl Anionic surfactants such as sulfonates, alkylsulfosuccinates, and alkyl phosphate ester salts may be used. These surfactants may be used as one kind or as a mixture of two or more kinds, and may be used as a mixture of nonionic and anionic types. In addition, in order to suppress the decomposition of C-1, it is preferable to use one that does not contain an oxyalkylene group.

The tablet of the present invention may contain a binder, a solid carrier, and other agrochemical auxiliaries, if necessary, in addition to the above components. The binder may be any one as long as it binds the constituent particles and is preferably water-soluble. For example, carboxymethyl cellulose, a salt thereof, dextrin, polyethylene glycol, polyvinyl alcohol, polyalkylene glycol. , Polyvinylpyrrolidone, lignin sulfonate, gum arabic,
Starch paste, other starches, sucrose and the like can be mentioned. Further, as the binder in the present invention, even if the binder itself is not generally used as a binder, any binder can be appropriately used as long as it has a function of binding each component particle. Examples of the substances that can be used in this manner include acidic substances such as succinic acid, adipic acid and phosphoric acid and salts thereof; alkaline substances such as sodium carbonate and sodium bicarbonate; high boiling points such as liquid paraffin and isoparaffin. Solvents; waxes; animal and vegetable oils and the like. As a solid carrier, mineral fine powder such as kaolin, talc, clay and bentonite; inorganic salts such as anhydrous sodium sulfate and sodium chloride; organic substances such as urea; synthetic polymer system such as polyacrylate system;
Examples include cellulose-based and starch-based highly water-absorbent resins, magnesium stearate, calcium carbonate, and other commonly used agricultural chemical aids, solvents, decomposition inhibitors, phytotoxicity-reducing agents, dispersion stabilizers, antifungal agents. , Disintegrants, desiccants, extenders and the like.

The blending ratio of the oil-absorptive carrier, binder, solid carrier and other pesticide auxiliaries cannot be specified unconditionally, but generally, the whole tablet is 100 parts by weight, and it is expressed as a weight ratio based on that. It is 0.1 to 40 parts by weight. When these are added to the tablet of the present invention, they are usually mixed in place of a part of the foaming agent.

Further, the tablet of the present invention can contain pigments mainly used in the food field, such as food blue No. 1 and food red No. 2, in which case the pigment serves as a guide during spraying work. The spraying work can be carried out efficiently, and it is effective in avoiding duplicate spraying.

The tablet of the present invention is usually produced by the following method or a method similar thereto. Compound A has a particle size of 50 μm by being pulverized in advance in order to improve dispersibility in water.
m or less, preferably 0.1 to 5 μm, used as fine particles, and compound B (excluding B-1), compound C-1, a surfactant, a foaming agent, and an oil-absorptive carrier optionally contained, Binders, solid carriers and other pesticidal auxiliaries are also ground, if necessary. Here, B as a herbicidal active ingredient
-1 is used after being mixed with a surfactant as necessary to impregnate the oil-absorbent carrier and further crushing the impregnated product as needed. As a method for producing tablets, for example, the herbicidal active ingredient treated as described above, the surfactant and the effervescent agent are mixed at the same time, or all the other ingredients are mixed by mixing any of the other ingredients in advance. A method of tableting by uniformly mixing and compression-molding this using a compression molding machine such as a tableting machine or a briquette machine according to a usual method, and further tableting after granulating arbitrary components once, for example. There is a method. The molding pressure of the compression molding machine differs depending on the components in the preparation, the compounding ratio, and the type and performance of the compression molding machine. Therefore, it is necessary to actually select an appropriate pressure by trial and error experiments. Further, when the tablet of the present invention is industrially produced, it can be continuously produced according to a usual tablet formulation method, but in this case, the composition is fluidized in order to enable continuous compression molding. It is desirable to give sex.

Further, when a binder, a solid carrier and / or other pesticide auxiliary agent is blended, this is uniformly mixed with the herbicidal active ingredient and the surfactant which have been previously treated as described above and pulverized to obtain a wettable powder. The method of blending with the foaming agent after the preparation of the above, and the herbicidal active ingredient treated as described above, the surfactant and the foaming agent are mixed at the same time, or they are mixed with any other ingredient in advance and further mixed with the other ingredients. Method etc. are mentioned. Needless to say, the tablet production method described above may be appropriately modified in consideration of drug efficacy, formulation properties, etc.

The tablets may have various shapes and sizes, such as a circular plate shape, an oval plate shape, a rectangular plate shape, a rod shape, a spherical shape, an elliptic spherical shape, and a donut shape, depending on the manufacturing method and the compression molding machine. Manufactured. Since the drug efficacy is not greatly affected by the shape of the tablet, any shape, size, or weight may be used, but the shape may be spherical or circular plate-like and the diameter may be 1 to 5 cm, Thickness 0.2-3c
It is preferable that m and weight are from 1 to 150 g in terms of formulation and drug application. Further, the above-mentioned components may be used as capsules as long as the desired effects of the present invention are not impaired.

As the method for producing the capsule, for example, the herbicidal active ingredient treated as described above, a surfactant and a foaming agent are uniformly mixed, and if necessary, a binder, a solid carrier and / or
Or, add other pesticide aids and mix them evenly, granulate the pulverized pulverized product, and fill the granules with capsules made of water-soluble cellulose, water-soluble starch, gelatin or the like, or granulate. Without crushing the pulverized product, a method of directly filling a wettable powder into a capsule, and further granulating any of the components as described above and other remaining components into tablets according to the method for producing the tablet. A method of filling the capsules in the same manner by using the crushed material may be mentioned. This capsule can also be formulated into various shapes, sizes and weights as in the case of tablets. In addition to those prepared as described above, the capsules are not filled with the above granules, pulverized products or wettable powders, and the water-soluble cellulose, water-soluble starch,
Those covered with a water-soluble film such as polyvinyl alcohol and gelatin are also included.

When the tablet of the present invention is applied to a flooded paddy field, a gas is generated upon contact with water, the herbicidal active ingredient is rapidly released into the paddy water, and the surfactant also acts to act as a herbicidal active ingredient. Disperse in water and disperse evenly. Thus, when the tablet of the present invention is administered to a paddy field, the herbicidal active ingredient can be rapidly dispersed in the paddy field, for example, for several hours to
Since the herbicidal active ingredient can be uniformly distributed in the paddy water after 20 hours, it is possible to control weeds uniformly without giving any phytotoxicity to the paddy rice.

When weeding a paddy field with the tablet of the present invention, 10 to 200 tablets are applied per 10 ares and the total weight of the tablet is 500 to 1500 g. Undesirable or labor-intensive spraying operation. A desirable application method cannot be unconditionally specified due to differences in tablet manufacturing method, size, herbicidal active ingredient, surfactant, effervescent agent and other additives, mixing ratio, etc., but 100 herbicidal active ingredients per 10 are. ~ 300g is divided into 1 to 30g per tablet, and 10 to 100 tablets are applied. Thus, only one tablet or capsule needs to be applied to every ¹⁰ to 100 m ² , and therefore it is not necessary to enter the paddy field but to throw it into the paddy field of the area from the ridge, so the spraying work is easy and damages the rice seedlings. Therefore, it is advantageous as compared with the conventional drug application methods.

Regarding the herbicidal composition of the present invention, for formulations other than the above-mentioned tablets, various forms prepared by blending the above-mentioned herbicidal active ingredient and various adjuvants in accordance with a usual agricultural chemical formulation method, for example, Preparations such as granules, wettable powders, wettable granules, and suspensions are also included. In these formulations, the herbicidal active ingredient is contained in a weight ratio of 1 to 98%, preferably 1 to 95%.

Examples of the adjuvant include those selected from the surfactants, oil-absorbent carriers, solid carriers, agricultural chemical aids and the like described above for tablets, as well as olive oil, kapok oil, castor oil, papaya oil, camellia oil, coconut oil and sesame oil. Vegetable oils such as corn oil, rice bran oil, peanut oil, cottonseed oil, soybean oil, rapeseed oil, linseed oil, cutting oil, liquid paraffin, mineral oils, solvents such as propylene glycol monomethyl ether, aluminum magnesium silicic acid, organizing Those selected from anti-settling agents such as bentonite, thickeners such as xanthan gum, and various auxiliary agents commonly used in the field of agrochemicals are appropriately used.

The herbicidal composition and tablet of the present invention can well control the growth of annual weeds to perennial weeds, and have a herbicidal effect when applied either before or after germination of weeds. In addition, when the paddy field is weeded using the composition and the tablet, generally, a preferable effect can be obtained by applying the paddy rice seedling before transplantation up to 20 days after transplantation. It can be applied at other times as long as it does not fall.

[0029]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited thereto. In addition, in the following formulation examples, "parts" are expressed on a weight basis.

Formulation Example 1 (1) A-11 crushed to an average particle size of 5 μm or less by a supersonic jet crusher (manufactured by Nippon Pneumatic Mfg. Co., Ltd.)
2.62 parts, powdered C-1 0.16 parts, fine powder amorphous silicon dioxide (trade name: Carplex CS-7; manufactured by Shionogi & Co., Ltd.) 1.50 parts, higher alcohol sodium sulfate ester (Brand name: Monogen Y-500; manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 1.0 part, sodium dioctyl sulfosuccinate (Brand name: Newcalgen EX-70; manufactured by Takemoto Yushi Co., Ltd.) 1.00 parts and carboxy 2.00 parts of sodium methylcellulose (trade name: Serogen PR; manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) are mixed in a plastic bag, and then mixed and pulverized by a micro sample mill (manufactured by Hosokawa Micron Co., Ltd.) to obtain a mixed powder a. Obtained. (2) Starch hydrolyzate (trade name: Pineflow; manufactured by Matsutani Chemical Co., Ltd.) 8.60 parts, sodium bicarbonate 22.00
Parts, sodium carbonate 14.50 parts, and succinic acid 30.
50 parts were mixed in a plastic bag to obtain a mixed powder b.

(3) B-1 4.62 parts and sorbitan monolaurate (trade name: Sorgen 90; manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 1.50 parts were placed in a beaker and stirred by hand with a stainless steel spoon. A mixed solution C was obtained. (4) After that, the mixed powders a and b are put into a rocking mixer (manufactured by Aichi Denki Co., Ltd.), and the mixed liquid c is sprayed and added to a place where the mixture is rotating and mixed, and the operation of the rocking mixer is appropriately rotated. The mixed powder and the mixed solution were sufficiently mixed with each other while shaking, or crushing to obtain a mixed powder D. (5) Put the compounded powder D into a punching die with a diameter of 2.5 cm,
A hand press (SSP-10A type; manufactured by Shimadzu Corporation) was compression molded with a gauge pressure of 3.5t, and the diameter was 2.5cm.
A tablet having a thickness of 1.7 cm and a weight of 12.54 g was obtained.

Formulation Example 2 (1) 2 parts of sorbitan monostearate (trade name: Sorgen 50; manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), Newkalgen E
X-70 (trade name) 4 parts and Carplex CS-7
6 parts of (brand name) were mixed in a plastic bag, further preliminarily mixed and pulverized in a mortar, and then pulverized and mixed by a centrifugal pulverizer (manufactured by Nippon Seiki Seisakusho Co., Ltd.) to obtain a mixed powder a. (2) 15 parts of bentonite was thinly spread and put in a vat, 4.62 parts of B-1 was sprinkled evenly on the vat, and after sufficiently absorbing oil, light hand mixing was performed to obtain a mixed powder b.

(3) A-1 12.62 parts, C-1
0.16 parts, bentonite 15 parts, calcium carbonate 3
9.1 parts, the mixed powder (a) and the mixed powder (b) were mixed in a plastic bag, and then mixed and pulverized by a centrifugal pulverizer to obtain a mixed powder c. (4) Beaker with 50 lignin sulfonic acid calcium salt
% Aqueous solution (trade name: Sun Extract C; manufactured by Sanyo Kokusaku Pulp Co., Ltd.), diluted with an appropriate amount of water, poured into and mixed with the compounded powder c, and then an appropriate amount of water is added. Mortar kneading until a state suitable for extrusion granulation was obtained. After that, the kneaded product was extruded and granulated by a table-top shaping granulator (72φ × 32-100W type manufactured by Shin-ei Kikai Seisakusho Co., Ltd.), dried and sized to obtain a granule.

Test Example 1 A 1 / 1,700a plastic vat was filled with paddy field soil, seeds of Novier, firefly and eel were sown and lightly covered with soil. After standing in a greenhouse at a water depth of 0.5 to 1 cm, when Nobie and Firefly sprout,
Tubers of Urikawa and Cyperus edulis were planted, and paddy rice seedlings grown at the 2-leaf stage were further transplanted. After that, keep the water depth at 3-4 cm, Nobie: 2 leaf stage, Firefly: 1.5
Leaf stage, eel: 1.5 leaf stage, Urikawa: 1.5 leaf stage, Mizugaya vine: At the time of reaching the 1 leaf stage, each herbicidal active ingredient of the herbicidal composition of the present invention was prepared according to a usual formulation method. A water-dilutable solution of a wettable powder was uniformly added dropwise with a pipette so that each herbicidal active ingredient had a predetermined dose.

On the 20th day after the chemical treatment, the growth state was visually observed, and the herbicidal effect and phytotoxicity were evaluated based on the following criteria, and the results shown in Table 1 were obtained.

[0036]

[Table 1]

As can be seen from the results shown in Table 1, the herbicidal composition of the present invention has an excellent herbicidal effect as compared with the case where each herbicidal active ingredient is used alone.

Test Example 2 A 1 / 3,000-a plastic vat was filled with paddy soil and seeds of firefly were sowed and lightly covered with soil. It was left standing in a greenhouse at a water depth of 0.5 to 1 cm, and a tuber of Urikawa was planted when the firefly sprouted.
After that, keep the water depth at 3 cm, firefly: 2.5 leaf stage,
Urikawa: At the time of reaching the 3-leaf stage, the same wettable powder water diluting solution as in Test Example 1 was uniformly dropped by a pipette so that each herbicidal active ingredient had a predetermined dose.

On the 30th day after the chemical treatment, the weeding rate was calculated from the remaining condition of the above-ground parts of each weed, and the judgment was made based on the following criteria, and the results shown in Table 2 were obtained.

It is to be noted that Colby (Col) is known as a method for assaying the interaction of herbicidal activity by three kinds of compounds.
by) (SR Colby, “Weeds”)
Vol.15, pp.20-22, 1967), the predicted herbicidal rate was calculated, judged based on the above criteria, and shown in Table 2 for comparison. Ea = herbicidal rate (%) when compound a was treated with x g / a Eb = herbicidal rate (%) when compound b was treated with y g / a Ec = weeding when compound c was treated with z g / a Ratio (%) A = Compounds a, b, and c are x, y, and z g / a, respectively.
Predicted herbicidal rate (%) after treatment If the measured value (%) of the herbicidal effect exceeds A, it means that synergism is observed in the three compound compositions, and if less than that, antagonism is observed. To do.

[0041]

[Table 2]

As can be seen from the results shown in Table 2, the herbicidal composition of the present invention has a clear synergistic herbicidal effect.

Test Example 3 Two 1 / 3,000a plastic bats filled with paddy soil were prepared at the same time (drainage area and non-drainage area).
Firefly and Urikawa were grown in the same manner as in Test Example 2, and when the firefly: 2 leaf stage and Urikawa: 2.5 leaf stage were reached, the same wettable water dilution as in Test Example 1 was added to each herbicidal component. The pipettes were evenly drip-treated so that the prescribed dose was reached, and 48 hours later, the water in the drainage area was adjusted to a water depth of 0.5.
The water was suctioned and drained to cm, and after about 5 hours, water was poured again to the same water depth (3 cm) as in the non-drained area. 30 days after the chemical treatment, the weeding rate was calculated from the residual state of the above-ground part of each weed, and Test Example 2
Judgment was made based on the same criteria as above, and the results in Table 3 were obtained.

[0044]

[Table 3]

From the results shown in Table 3, the herbicidal composition of the present invention is
It is clear that the effect is less susceptible to fluctuations due to the movement of paddy water in the early stage after the chemical treatment, and even when the herbicidal composition of the present invention is applied to an actual paddy field, the effect is caused by the outflow of paddy water due to water leakage or rainfall. It can be said that it has a performance that does not easily decrease.

Test Example 4 A 1.25 m × 10 m test section (FIG. 1) was set up in a vinyl house, paddy soil containing seeds of millet, firefly, and eel was placed therein, and after-water-scraping was carried out. Two days later, tubers of Urikawa and Mizuhigayuri were planted (point in Fig. 1: Urikawa, ◎ point: Mizugaya), water depth 2-3 c.
managed by m. After that, Hie: 0.8-1.2 leaf stage, Firefly: 0.8-1.3 leaf stage, Konagi: 0.5 leaf stage, Urikawa: 1-1.5 leaf stage, Mizugayatsuri: 0.5- At the time of reaching the 1-leaf stage, the water depth was adjusted to about 4 cm, and 1 tablet prepared in the above Preparation Example 1 was dropped (point in FIG. 1). 30 days after the chemical treatment, the growth state (A to D in FIG. 1)
Each part) was evaluated in the same manner as in Test Example 1,
The results shown in Table 4 were obtained.

[0047]

[Table 4]

From the results shown in Table 4, it can be seen that an excellent herbicidal effect can be obtained over the whole area even by the topical application of the tablet of the present invention, which greatly saves the application work.

[0049]

[Brief description of drawings]

FIG. 1 shows a test area of 1.25 m × 10 m, where x indicates a tuber of Urikawa, ∘ indicates a point where a tuber of Mizugaya vine is implanted, and ◯ indicates a point where a tablet is dropped.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location A01N 43/40 101 B 9159-4H 43/56 C 9159-4H A 9159-4H 43/78 101 9159-4H ( 72) Inventor Kazuyuki Maeda 2-3-1, Nishi-Shibukawa, Kusatsu-shi, Shiga Ishihara Sangyo Co., Ltd. Central Research Laboratory (72) Inventor, Yasuo Morishima 2-3-1, Nishi-shibukawa, Kusatsu-shi, Shiga Ishihara Sangyo Co., Ltd. In the laboratory

Claims (3)

[Claims] 1. 4- (2,4-dichlorobenzoyl)-
1,3-dimethyl-5-phenacyloxypyrazole,
4- (2,4-dichlorobenzoyl) -1,3-dimethylpyrazol-5-yl-p-toluenesulfonate or 4- (2,4-dichloro-3-methylbenzoyl)-
A pyrazole-based compound selected from 1,3-dimethyl-5- (4-methylphenacyloxy) pyrazole and 2
-Chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide, 2- (2-benzothiazolyloxy) -N-methyl-N-phenylacetamide and S, S-dimethyl-2- Difluoromethyl-4- (2
-Methylpropyl) -6- (trifluoromethyl)-
At least one compound selected from the group consisting of 3,5-pyridinedicarbothioate and N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl]-
A herbicidal composition for paddy fields, which comprises a combination of 4-ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide with a sulfonylurea compound. 2. 4- (2,4-dichlorobenzoyl)-
1,3-dimethyl-5-phenacyloxypyrazole,
4- (2,4-dichlorobenzoyl) -1,3-dimethylpyrazol-5-yl-p-toluenesulfonate or 4- (2,4-dichloro-3-methylbenzoyl)-
A pyrazole-based compound selected from 1,3-dimethyl-5- (4-methylphenacyloxy) pyrazole and 2
-Chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide, 2- (2-benzothiazolyloxy) -N-methyl-N-phenylacetamide and S, S-dimethyl-2- Difluoromethyl-4- (2
-Methylpropyl) -6- (trifluoromethyl)-
At least one compound selected from the group consisting of 3,5-pyridinedicarbothioate and N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl]-
A paddy field herbicide tablet comprising a herbicidal active ingredient comprising a combination of 4-ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide with a sulfonylurea compound, a surfactant and a foaming agent. 3. The paddy field herbicidal tablet according to claim 2 is applied to a paddy field flooded so that 10 to 200 tablets per 10 ares and the total weight of the tablets are 500 to 1500 g, and the herbicidal active ingredient. A method for weeding a paddy field, which comprises: