JPH0747521B2 - Aqueous suspension formulation and application method for flooded paddy field after rice planting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aqueous suspension preparation for weeding in a flooded sewage paddy after planting and a spraying method.

[Prior Art] Conventionally, as a formulation form of herbicide for flooded sewage paddy, generally, two types, a granule having an advantage that it can be easily applied and an emulsion for spraying undiluted rice in the rice field, occupy the majority. An emulsion or wettable powder that is diluted with a large amount of water and sprayed is used.

Granules are most often used because they are relatively easy to apply. To formulate this granule, the herbicidal drug substance (the active ingredient of the herbicide) is mixed and pulverized with a fine powder carrier such as bentonite, talc, or crepe, and then the granulation step is performed, or the fine powder carrier is produced. There are various methods such as a method in which a herbicide drug substance is uniformly mixed with a granular carrier obtained by granulation and adsorbed. Since these are subjected to granulation and drying steps or by adsorption, the herbicide bulk is strongly adsorbed to the carrier, resulting in a decrease in the effective utilization of the herbicide bulk. Therefore, in the case of granules, to obtain the same herbicidal effect as an emulsion or wettable powder diluted with a large amount of water,
It is necessary to mix the herbicide bulk with the granules in a large amount and spread the granules, which leads to a high cost of the drug or is not preferable from the viewpoint of environmental pollution.

In addition, a certain amount of granules is required to be evenly distributed in the paddy field, and currently 3 to 4 kg per 10 are.
kg of product is sprayed. This product is a little heavy,
Furthermore, since it is considerably bulky, it has many disadvantages in terms of transportation, storage, etc. as compared with wettable powders or emulsions.

On the other hand, the emulsion for spraying undiluted rice before rice transplantation can be easily sprayed without the use of equipment like granules, and it is equivalent even if the amount of the herbicide raw material sprayed per same area is smaller than in the case of granule spraying. The effect of can be obtained. However, when the undiluted solution of this emulsion is sprayed after rice planting, that is, after transplanting rice seedlings,
There is a drawback that it causes serious phytotoxicity to paddy rice mainly due to the organic solvent contained in a large amount in the preparation. Therefore, the emulsion for undiluted solution application can only be applied before rice transplanting. Furthermore, emulsions have many problems, such as toxicity and irritation to humans and small animals due to organic solvents in the formulation, problems of offensive odor, and caution in transportation and storage from the viewpoint of flammability. There is.

In addition, in the conventionally used emulsion or powder wettable powder that is diluted with a large amount of water and sprayed,
A great deal of labor is required at the time of spraying to dilute the drug in about 50 to 100 water. For this reason, it has much less chance of application than granules or emulsions for pre-rice plant spray. Further, in the case of an emulsion, there is a problem caused by the above-mentioned organic solvent, and in the case of a wettable powder, there is a problem in handling and working environment that fine powder is scattered during preparation of a spray liquid. .

In recent years, an aqueous suspension formulation has been developed in addition to an emulsion or powdery wettable powder as one of the agricultural chemical formulation forms to be used after diluting with a large amount of water. In general, when the pesticidal drug substance is a solid, this aqueous suspension preparation is pulverized into a fine powder with an average particle size of about 0.5 μ to 10 μ, and water is used as a dispersion medium to form a surfactant and, if necessary, a water-soluble formulation. It is a formulation in which a hydrophilic polymer and the like are blended and stabilized in a suspension state.

When used, this aqueous suspension preparation is diluted with a large amount of water of 50 to 100 per 10 are and sprayed in the same manner as a wettable powder in the form of emulsion or powder. In this case, it is possible to expect a medicinal effect equivalent to that obtained by diluting an emulsion or powdery wettable powder in a large amount of water and spraying it. In addition, since the dispersion medium is water, there are almost no problems such as toxicity, irritation or bad odor to humans and small animals due to organic solvents, as compared with emulsions. However, since it is diluted with a large amount of water and then sprayed, a great deal of labor is required at the time of spraying, and it is not applied as a spraying method for herbicide for paddy fields.

In addition, the aqueous suspension formulation is suitable for high-concentration small-quantity spraying in the air by an aircraft, but since it is sprayed in a fine mist, the drift of the drug to the residential area, urban area, etc. outside the spraying area becomes a problem. Has become. Airborne application of pesticides by aircraft in the field of paddy rice is applied only to insecticides and fungicides, not as a method of applying herbicides. This is because the rice planting date and time is different for each paddy field,
Since the growth condition of various weeds occurring after rice planting is different in each paddy field, it is necessary to spray the herbicide to each paddy field according to the growth condition of the weeds. This is because it is practically impossible to apply the method over a wide area such as airborne application.

[Problems to be solved by the invention]

As described above, all the herbicide formulation forms conventionally applied to flooded paddy fields have various problems.

The present inventors have found that, in a flooded sewage paddy field after rice planting, it is as easy to spray as a granule or an emulsion for undiluted solution spraying, and weeding is performed similarly to a wettable powder or emulsion diluted with a large amount of water and sprayed. As a result of intensive studies to develop a formulation form of a herbicide which can sufficiently exert the herbicidal effect of the drug substance, and further shows little phytotoxicity to seedling rice such as immediately after rice planting, the present invention was obtained. completed.

[Means and Actions for Solving Problems]

The present invention, the solubility of the herbicide at 25 ° C in water at 100 ppm or less is 1 to 60%, contains 30 to 95% of water, and the remaining main component is a surfactant. Aqueous suspension formulation for direct spraying after paddying of paddy field (hereinafter referred to as the composition of the present invention), and a method for spraying a herbicide, which comprises spraying the aqueous suspension formulation directly onto a flooded paddy field after planting. (Hereinafter, referred to as the spraying method of the present invention).

The composition of the present invention is easy to spray, can exert a sufficient herbicidal effect even with a small amount of the herbicide bulk applied to the same area as compared with the case of granules, and further to seedling rice such as immediately after rice planting. It has an excellent feature that it shows little drug damage.

As the method for producing the composition of the present invention, when the herbicide bulk is a solid at room temperature, for example, a method of previously pulverizing the herbicide bulk with an air mill or a hammer mill and then dispersing it in water together with a surfactant, or an interface A method in which a herbicide bulk is mixed with water containing an activator and dispersed while being atomized by a wet mill such as a ball mill, vibration mill, tower mill, or sand mill, or the herbicide bulk is pulverized to some extent in advance. And the like, and then further disperse it in water together with the surfactant, and further atomize it with the above-mentioned wet pulverizer.

When the herbicide bulk is liquid at room temperature, for example, the bulk and the surfactant are mixed in advance, and water is gradually added with stirring to disperse the ingredients uniformly, or the bulk is mixed with an aqueous solution of the surfactant. Then, a method of stirring and uniformly dispersing the same can be used.

The surfactant that can be used in the composition of the present invention is not particularly limited, and those conventionally used in the field of agrochemical formulations can be used. For example, lignin sulfonate, alkylallyl sulfonate, dialkyl sulfosuccinate. , Polyoxyethylene alkyl allyl phosphate, polyoxyethylene alkyl allyl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate and other anionic surfactants, polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl Ether, polyoxyethylene alkyl ether, polyoxyethylene sorbitan alkylate, polyoxyethylene glycol, polyoxyethylene alkyl ester,
Examples thereof include nonionic surfactants such as polyoxyalkylene glycol. These surfactants may be used alone or in combination of two or more, and the mixing ratio in the case of mixing may be arbitrarily selected.

In the composition of the present invention, a water-soluble polymer compound can be used in combination with the surfactant. Examples of the water-soluble polymer compound that can be used include gum arabic, sodium alginate, tragacanth gum, xanthan gum (xanthan gum), dextrin, gelatin, casein, glue, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone. , Soluble starch, sodium polyacrylate, etc.

Further, examples of the antifreezing agent of the composition of the present invention in the cold season include ethylene glycol, propylene glycol, glycerin, methanol, ethanol, isopropanol, urea, alkali halide salts and the like.

Further, the composition of the present invention may contain other components such as a defoaming agent such as silicone, or an antifungal agent.

The herbicidal drug substance that can be used in the composition of the present invention has a solubility in water at 25 ° C. of 100 ppm or less. When the herbicidal drug substance having a solubility in water at 25 ° C. of 100 ppm or more is applied to the composition of the present invention and the spraying method of the present invention,
The active ingredient may be washed away due to water leakage in the paddy field, or the active ingredient may be washed away into the river due to dissolution in the flooded water of the paddy field, and the herbicidal drug substance may not be able to exert its full herbicidal effect. If the herbicidal drug substance has a solubility in water at 25 ° C of 100 ppm or less, a stable herbicidal effect can be obtained without such a problem.

The herbicidal drug substance that can be used in the composition of the present invention is not particularly limited as long as it has a solubility in water at 25 ° C. of 100 ppm or less of the herbicidal drug substance, and specific examples include the following compounds. . It goes without saying that the herbicidal drug substance that can be used in the composition of the present invention is not limited to the compounds of this specific example. This compound No. is cited in the description below.

Compound No. Compound name 1 O-4-tert-butylphenyl = N- (6-methoxy-
2-pyridyl) -N-methylthiocarbamate 2 O-3-tert-butylphenyl = N- (6-methoxy-2
-Pyridyl) -N-methylthiocarbamate 3 O-4-chloro-3-ethylphenyl = N- (6-methoxy-2-pyridyl) -N-methylthiocarbamate 4 O-4-bromo-3-ethylphenyl = N- (6-Methoxy-2-pyridyl) -N-methylthiocarbamate 5 3-tert-butyl-4-chlorophenyl = N- (6-methoxy-2-pyridyl) -N-methylcarbamate 6 O-4-trifluoromethylphenyl = N- (6-methoxy-2-pyridyl) -N-methylthiocarbamate 7 1- (α, α-dimethylbenzyl) -3- (4-methylphenyl) urea [generic name: Daimlon] 8 N- (α, α-dimethylbenzyl) -2-bromo-3,
3-Dimethylbutyramide [generic name: bromobutide] 9 2- (2-naphthyloxy) propionanilide [generic name: naproanilide] 10 2- (2,4-dichloro-3-methylphenoxy) propionanilide [Test name: MY -15] 11 4- (2,4-Dichlorobenzoyl) -1,3-dimethyl-5
-Pyrazolyl = p-toluenesulfonate [generic name: pyrazolate] 12 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-phenacyloxypyrazole [generic name: pyrazoxifene] 13 4- (2,4 -Dichloro-3-methylbenzoyl) -1,3-
Dimethyl-5- (4-methylphenacyloxy) pyrazole [Test name: NY-71] 14 5-Benzyloxy-4- (2,4-dichlorobenzoyl)
-1-Methylpyrazole [Test name: NC-310] 15 2,4,6-Trichlorophenyl = 4-nitrophenyl ether [Generic name: Chlornitrophen] 16 2,4-Dichlorophenyl = 3-methoxy-4-nitrophenyl ether [General name: clomethoxynil] 17 2,4-dichlorophenyl = 3-methoxycarbonyl-4-
Nitrophenyl ether [generic name: bisphenox] 18 2-chloro-4-trifluoromethylphenyl = 4-nitro-3- (tetrahydropyran-3-yloxy) phenyl ether [Test name: MT-124] 19 N- Methyl-2- (2-benzothiazolyloxy) acetanilide [Test name: NTN-801] 20 2 ', 3'-Dichloro-4-ethoxymethoxybenzanilide [Test name: HW-52] 21 5-tert- Butyl-3- (2,4-dichloro-5-isopropoxyphenyl) -1,3,4-oxadiazole-2 (3H)
-ON [generic name: oxadiazon] 22 2-amino-3-chloro-1,4-naphthoquinone [generic name: ACN] 23 2- (4,6-dimethoxypyrimidin-2-yl) aminocarbonylaminosulfonylmethyl] benzoic acid Acid methyl ester [Test name: DPX-84] 24 N-butoxymethyl-2-chloro-2 ′, 6′-diethylacetanilide [General name: butachlor] 25 N-propoxyethyl-2-chloro-2 ′, 6 ′ -Diethylacetanilide [generic name: pretilachlor] 26 S-4-chlorobenzyl = N, N-diethylthiocarbamate [generic name: ventiocarb] 27 S-α, α-dimethylbenzyl = N, N-pentamethylenethio Carbamate [Test name: MY-93] 28 S-benzyl = N-ethyl-N- (1,2-dimethylpropyl) thiocarbamate [Test name: SC-2957] Do Depending on the grass species of the weeds, one kind may be used alone, or two or more kinds may be mixed and mixed, and the mixing ratio in the case of mixing may be arbitrarily selected. These herbicidal drug substances are contained in the composition of the present invention in an amount of 1 to 60%.
It is contained in the range of. In addition, the composition of the present invention contains 30 to 95
%, The main component of the balance is a surfactant.

The composition of the present invention, like the granules and emulsion for undiluted solution,
It can be sprayed easily and easily without using any special equipment. Further, the composition of the present invention can obtain a sufficient herbicidal effect equal to or higher than that of the granule even if the amount of the herbicidal drug substance applied to the same area is small. In addition, unlike the emulsion for spraying undiluted solution, the major feature is that even if the composition of the present invention is sprayed after rice planting, there is little chemical damage to the seedling transplanted rice.

The composition of the invention can be applied directly without diluting the stock solution with further water. For spraying, a stock solution of the composition of the present invention is dropped onto the entire surface of a paddy field under flooding, or a drop operation is performed for work at the time of rice planting, and water is input after rice planting. It is also possible to spread the chemicals over the entire surface of the paddy field by directly dripping the inflow water at the intake.

The amount of the composition of the present invention used per unit area is not particularly limited, but is preferably in the range of 0.1 to 4 per 10 ares, more preferably 0.3 to 2 per 10 ares from the viewpoint of spraying labor and formulation. It is a range.

Since the undiluted solution of the composition of the present invention is directly applied by spraying, the volume of undiluted solution applied to 10 ares can be adjusted in the range of 0.1 to 4, and in this case, 3 kg to 4 kg per 10 ares when granules are applied. The volume and weight of the product can be significantly reduced as compared with the spray amount, which is very advantageous in terms of transportation and storage of the product.

〔Example〕

Next, examples of formulations of the composition of the present invention and comparative examples of formulations of wettable powders, emulsions and granules used for comparison will be described. In the examples and comparative examples, “part” means part by weight.

Example 1 Compound No. 1 (12 parts), ethylene glycol (5 parts), xanthan gum (Zansan gum) 0.15% +, which was previously dry-milled with a pin mill 160Z type (manufactured by Fuji Sangyo Co., Ltd.)
Guar gum 0.15% aqueous solution 78.5 parts, Solpol 9838 [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 2 parts, Solpol 9047K
[Product name, manufactured by Toho Chemical Industry Co., Ltd.] Part 2, Pronal EX
-200 [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 0.5 parts, hard glass beads with a diameter of 1 to 1.5 mm for grinding were added, and a four-cylinder sand grinder [manufactured by Igarashi Machinery Co., Ltd.]
Pulverization at 2200 rpm for 1 hour gave a uniform aqueous suspension formulation.

In Examples 2 to 4, the same operations as in Example 1 were performed using the following components to obtain aqueous suspension formulations.

Example 2 Compound No. 3 2 parts Ethylene glycol 5 parts Xanthan gum 0.15% + Guar gum 0.15% Aqueous solution 88.5 parts Solpol 9838 2 parts Solpol 9047K 2 parts Pronal EX-200 0.5 parts Example 3 Compound No. 2 50 parts Ethylene glycol 5 parts Xanthan gum 0.2 parts Solpol 9838 5 parts Solpol 9047K 1 part Pronal EX-150 [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 1 part water 37.8 parts Example 4 Compound No. 3 6 parts ethylene glycol 5 parts xanthan gum 0.15% + guar gum 0.15% aqueous solution 84.5 parts Solpol 9838 2 parts Solpol 9047K 2 parts Pronal EX-200 0.5 parts Example 5 Compound No. 26 10 parts and Solpol 355 [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 4 parts, Pronal EX-200 A mixture of 0.55 parts xanthan gum 0.15% + guar gum 0.15% aqueous solution 80.5 parts and ethylene glycol 5 parts while mixing 0.5 parts vigorously. Dropwise to give a uniform aqueous suspension concentrate.

In Example 6, the same operations as in Example 5 were carried out using the following components to obtain an aqueous suspension preparation.

Example 6 Compound No. 24 5 parts Ethylene glycol 5 parts Xanthan gum 0.15% + Guar gum 0.15% Aqueous solution 86.5 parts Solpol 3628K [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 3 parts Pronal EX-200 0.5 part Comparative Example 1 Compound No. .1 10 parts, 87.3 parts of Kunilite [trade name, manufactured by Kunimine Industry Co., Ltd.], 1.35 parts of Neoperex [trade name, manufactured by Kao Atlas Co., Ltd.] and Solpol 800A [trade name, manufactured by Toho Chemical Industry Co., Ltd.] ] 10% wettable powder was obtained by mixing and grinding with 1.35 parts.

Comparative Example 2 Compound No. 2 (10 parts), xylene (80 parts) and solpol
It was mixed and dissolved with 10 parts of 800A to obtain a 10% emulsion.

Comparative Example 3 Compound No. 3 3.5 parts was bentonite 30 parts, talc 60.
5 copies, Solpol 9047K 2 copies Solpol 5160 [Product name,
Toho Chemical Industry Co., Ltd.] 2 parts and Solpol 355 2.
After mixing and pulverizing the parts, 10 parts of water was added and uniformly stirred, extruded through a sieve hole having a diameter of 0.7 mm, dried and cut into a length of 1 to 2 mm to obtain 3.5% granules.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Examples 7 to 30 and Comparative Examples 4 to 41 Paddy soil in a substituting state was placed in a plastic container having an area of 1836 cm ² (31 x 56 cm) to a depth of 7 cm from the bottom, and seeds of Novie were sown on the entire surface of the soil, and 2 leaves were used. Paddy rice seedlings (cultivar:
Nihonbare), 6 plants were planted, 2 at a depth of 1 cm. Next day 3 cm
Was flooded and grown in a greenhouse. Each drug was treated with a predetermined amount 3 days after transplanting rice seedlings and 1.5 leaf stage of Nobie (9 days after transplanting rice seedlings). The treatment was carried out by the method described below for each formulation.

(Treatment Method 1) A predetermined amount of the stock solution of the composition of the present invention prepared according to Example 4 was dropped by a pipette only near the center of the water surface of the plastic container.

(Treatment Method 2) A predetermined amount of the stock solution of the composition of the present invention prepared according to Example 4 was added dropwise to the water surface of a plastic container with a pipette at substantially equal intervals.

(Treatment Method 3) A predetermined amount of the wettable powder prepared according to Comparative Example 1 was diluted with 9 ml of water (equivalent to about 50 when converted per 10 ares to be sprayed), and then dripped on the entire water surface of the plastic container. I went.

(Processing Method 4) A predetermined amount of the emulsion prepared according to Comparative Example 2 was diluted with 9 ml of water and then added dropwise to the entire water surface of the plastic container.

(Processing method 5) A predetermined amount of an undiluted solution of the emulsion prepared according to Comparative Example 2 was dropped onto the water surface of a plastic container with a pipette at substantially equal intervals.

(Treatment Method 6) A predetermined amount of the granule prepared according to Comparative Example 3 was sprayed on the water surface of the plastic container at substantially equal intervals.

Further, as a comparative example, a drug-untreated plastic container (untreated section) was also prepared.

After each chemical treatment, each plastic container is allowed to stand in the greenhouse,
Watered at appropriate times. One month after the chemical treatment, the herbicidal effect and the effect on the paddy rice were examined by observation. The herbicidal effect and phytotoxicity were evaluated according to the following criteria. The results of the 3-day post-treatment of paddy rice seedlings are shown in Table 1, and the results of the 1.5 leaf stage treatment of Novier are shown in Table 2.

Examples 31 to 36 and Comparative Examples 42 to 48 The paddy soil in the state of substituting was put in a plastic container having an area of 1836 cm ² (31 × 56 cm) to a depth of 7 cm from the bottom, and a 2-leaf stage paddy rice seedling (variety: Nipponbare) was placed at 1 cm. 9 plants were planted at a depth of 1 each. The next day, after injecting 3 cm of water, each chemical was treated by the method described below.

(Treatment Method 7) One drop of each undiluted solution of the composition of the present invention prepared according to Example 4 and the emulsion prepared according to Comparative Example 2 was pipetted into the center of the second leaf blade of each paddy rice seedling. Dropped. At this time, the adherence of the drug to the leaf blade was observed according to the following criteria.

Adhesion status of chemicals Evaluation criteria Adhesion status No Adhesion None No slight adhesion, most drops Dropped Small adhesion Small half-medium adhesion Large majority to all adhesion (Treatment method 8) Use the same stock solution of the treatment used in treatment method 7. 9 each
Droplets were dropped on the water surface of the plastic container at substantially equal intervals.

As a comparative example, a chemical-untreated plastic container (untreated section) was also prepared.

After each chemical treatment, the water depth of each plastic container was kept at 3 cm in the greenhouse while avoiding watering the foliage. Three weeks after the chemical treatment, the chemical damage to paddy rice was evaluated by observation according to the above criteria. Table 3 shows the evaluation results and the state of attachment of the chemicals to the leaf blades of paddy rice during the chemical treatment.

Examples 37 to 42 and Comparative Examples 49 to 52 A concrete pot having a drainage port at the bottom and an area of 2500 cm ² (50 x 50 cm) was filled with gravel to a depth of 5 cm from the bottom, and sand was placed on the pad to 2 cm. The soil was packed to a thickness of 17 cm.
An appropriate amount of water was added to make a rough scraping state in a portion of about 5 cm from the surface layer. Sow novier seeds on the soil surface, and two 2-leaf stage paddy rice seedlings (cultivar: Nihonbare) 2 at a depth of 1 cm 6
Planted a plant. The next day, 3 cm of water was poured. Three days after transplanting the rice seedlings, a predetermined amount of the composition of the present invention prepared according to the above Example 4 was treated in the same manner as the above-mentioned treatment method 2.
As a comparative example, S-ethyl = N, N-hexamethylene thiocarbamate [generic name: molinate] (water solubility 900 pp
m) was treated according to the same method as the aqueous suspension preparation prepared according to Example 5. Further, as a comparative example, a drug-untreated section was also prepared.

After the chemical treatment, 3 cm of water leakage per day for 3 days and a non-leakage area were provided. After that, the water depth was kept at 3 cm. One month after the chemical treatment, the herbicidal effect and the chemical damage to paddy rice were observed and evaluated according to the above criteria. The results are shown in Table 4.

Examples 43 to 48 and Comparative Examples 53 to 60 Paddy fields were cultivated, substituting, and then partitioned into 4 m ² (2 x 2 m) using a board and a ridge board, and sowing seeds of Novier seeds, and 2 2 paddy rice seedlings (variety: Nihonbare) at the leaf stage at a depth of 3 cm
18 plants were planted each. The next day, water was flooded to 2-3 cm. 3 days after transplanting rice seedlings and 1.5 leaf stage of Novier
After a day), a predetermined amount of each drug was treated. The composition of the present invention was prepared according to the above Example 4 and treated according to the above treating method 2. Granules were prepared according to Comparative Example 3 and treated according to Treatment Method 6. Further, as a comparative example, an untreated section was also prepared.

After that, the water depth was kept at 2-3 cm. Survey is drug processing 1
After a month, the herbicidal effect and the phytotoxicity to paddy rice were evaluated by observation according to the above criteria. The results of the 3-day post-treatment of paddy rice seedlings are shown in Table 5, and the results of the Novier 1.5 leaf stage treatment are shown in Table 6.

[Effects of the invention] As is clear from the above Examples and Comparative Examples, when the composition of the present invention and the method of application of the present invention are used, the herbicidal drug substance applied to the same area as compared with the case of granule application is used. A sufficient herbicidal effect can be achieved even with a small amount. Also, compared to a wettable powder or emulsion diluted with 50 to 100 water per 10 ares and sprayed, or a granule with 3 to 4 kg per 10 ares sprayed per 10 ares can be reduced. Therefore, the merit of reducing the spraying labor is great. It is also advantageous in terms of transportation and storage. Furthermore, in the emulsion for undiluted solution spraying, since the undiluted solution of the emulsion causes tremendous phytotoxicity when attached to the rice leaf blade portion, it cannot be sprayed after transplanting rice, but the composition of the present invention sprays the drug after transplanting rice. However, it causes only slight chemical damage to paddy rice, and practically causes no problems.

As described above, the composition of the present invention and the spraying method of the present invention,
It has many excellent features and is highly practical.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-36458 (JP, A) JP-A-55-79303 (JP, A) JP-A-60-214701 (JP, A) JP-B-52- 39725 (JP, B2) Tetsuo Takematsu, "Latest Herbicidal Method for Herbicides" Paddy and Paddy Urasaku (Revised Supplement), issued September 1, 1937, p. 115-119 Proc. So. Weed Sci. S oc. , 29; 439-441 (1976)

Claims (2)

[Claims] 1. A submerged water containing 1 to 60% of the herbicide drug substance having a solubility in water at 25 ° C. of 100 ppm or less and 30 to 95% of water, and the residual main component is a surfactant. An aqueous suspension formulation for direct spraying after sewage paddy planting. 2. An aqueous suspension containing 1 to 60% of the herbicide drug substance whose solubility in water at 25 ° C. is 100 ppm or less, 30 to 95% of water, and the main component of the remainder being a surfactant. A method for spraying a herbicide, which comprises spraying a formulation directly onto a flooded paddy field after rice planting.