JPH03128301A - Herbicide for rice fields - Google Patents

Abstract

PURPOSE:To obtain the title herbicide excellent in diffusibility in a paddy with abundant water enabling various kinds of labor-saving application method to be adopted, by incorporating a herbicide active ingredient plus surfactant with each specified proportion of a carbonate and water-soluble solid acid. CONSTITUTION:The objective foamable paddy herbicide comprising (A) a herbicide active ingredient, (B) a surfactant, (C) a carbonate, and (D) a water-soluble solid acid. The amount of the component C plus the component D accounts for 20-85wt.% (pref. ca. 40-50wt.%) of the total weight. The weight ratio of the component C to the component D is (1:5)-(5:1) [pref. ca. (1:3)-(3:1)]. The component C is pref. sodium bicarbonate, sodium carbonate, etc.; whereas the water-soluble solid acid is pref. maleic acid, fumaric acid, boric acid, etc. The present herbicide migrates while generating CO2 gas, when applied on a paddy with abundant water; therefore, the herbicide active ingredient will quickly, uniformly diffuse into the paddy field.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a foaming herbicide for paddy fields.

<Prior art> As a foaming herbicide for paddy fields, Japanese Patent Publication No. 47-27930
It is stated in the publication number etc.

<Problems to be Solved by the Invention> However, the formulation described in the above publication has problems such as insufficient dispersibility and insufficient efficacy when applied to paddy fields.

Means for Solving the Problems> In view of the above circumstances, the present inventors conducted studies and found a more useful effervescent herbicide for paddy fields, leading to the present invention.

That is, the present invention contains a herbicidal active ingredient, a surfactant, a carbonate, and a water-soluble solid acid, and the total weight of the carbonate and the water-soluble solid acid is 20=85% of the total weight, and , the weight ratio of carbonate and water-soluble solid acid is l:5~
This relates to a herbicide for paddy fields (hereinafter referred to as the herbicide of the present invention) having a ratio of 5:1.

In the herbicide of the present invention, the total weight of carbonate and water-soluble solid acid is preferably 40 to 70% of the total weight, and the weight ratio of carbonate to water-soluble solid acid is 1:3 to 1:3.
A range of 3:l is preferable.

The herbicidal active ingredient used in the herbicide of the present invention is not particularly limited, but includes, for example, the following compounds (including optically active substances).

) can be given.

(1) (2) (3) (4) (5) (6) (7) (8) (R8)-2-bromo-N-(α,α-dimethylbenzyl)-3,3-dimethylbutyramide 〇-Ethyl〇-(5-methyl-2-nitrophenyl)-N-sec-butylphosphoramidothioate N-(chloroacetyl)-N-(2゜6-dinitylphenyl)grin ethyl ester 1-( α,α-dimethylbenzyl) 3-(4-methylphenyl)urea 2-(2-naphthyloxy)propionanilide 2-(2,4-dichloro-3-methylphenoxy)propionanilide 4-(2,4-dichloro benzoyl) 1,3-dimethyl-5-pyrazolyl p-toluenesulfonate 4-(2,4-dichlorobenzoyl) -1,3-dimethyl-5-phenacylo(9) xypyrazole 4-(2,4-cyclo3- methylbenzoyl)-1,3-dimethyl-5 (4-methylphenacyloxy)pyrazole (10) 2. 4. 6-1-dichlorophenyl
4 Nitrophenyl ether (11) 2. 4-dichlorophenyl 3-methoxy-4-nitrophenyl ether (12) 2. 4-dichlorophenyl 3-methoxycarbonyl-4-nitrophenyl ether (13) N-methyl-2-(2-benzothiazolyloxy)acetanilide (14) 2', 3°-dichloro-4-ethquin Methoxybenzanilide (15) 5-tert-butyl-3-(2
,4-dichloro-5-isopropoxyphenyl)-1,
3,4-oxadiazol-2(3H)-one (16) 2-amino-3-chloro-1,4-naphthoquinone (17) 2-[(4,6-cymethoxypyrimidin-2-yl)amino Carbonylaminosulfonylmethylbenzoic acid methyl ester (18) 3. 7-dichloro-8-quinolinecarboxylic acid (19) 5-((4,6-cymethoxypyrimidin-2-yl)aminocarbonylaminosulfonyl)-1
-Methylpyrazole-4-carboxylic acid ethyl ester (20) 3-chloro-2-[2-fluoro-4-chloro-5-(2-propynyloxy)phenyl)-4,5,6,7-tetrahydro- 2
H-indazole (21) 0-4-tert-butylphenyl N-(
6-medoxy2-pyridyl)-N-methylthiocarbamate (22) 0-3-tert-butylphenyl N-(
6-Medoxy (2-pyridyl)-N-methylthiocarbamate (23) 0-4-chloro-3-ethylphenyl N-
(6-Medoxy 2-pyridyl)-N-methylthiocarbamate (24) 0-4-bromo-3-ethylphenyl N-
(6-Medoxy 2-pyridyl)-N-methylthiocarbamate (25) 3-tert-butyl-4-chlorophenyl N-(6-Medoxy 2-pyridyl)-N
-Methylthiocarbamate (26) 0-4-trifluoromethylphenyl N-(6-medoxy-2-pyridyl)-N-methylthiocarbamate (27) 1-(2-chlorobenzyl)-3-(α,
α-dimethylbenzyl)urea (28) 3-chloroo-2-(7-fluoro-4-propargyl-2H-1,4-benzoxazine-3(4
H)-one-6-yl)-4,5,6,7-tetrahydro2H-indazole (29) 5-benzyloxy-4-(2,4-dichlorobenzoyl)-1-methylpyrazole (30) 2- Chloro-4-trifluoromethylphenyl 4-nitro-3-(tetrahydropyran-3-yloxy)phenyl ether Among these herbicidal active ingredients, those with low melting points are added with a high-boiling point solvent to prevent crystallization. be able to.

The above herbicidal active ingredients can be used singly or in a mixture of two or more depending on the species of weeds to be weeded, and when mixed, the blending ratio can be arbitrarily selected. The amount of these herbicidal active ingredients varies depending on the type of active ingredient, but is generally 0.1 to 6% based on the total weight.
The range is 0%, preferably 10-50%.

Examples of the surfactant used in the herbicide of the present invention include alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate, alkylnaphthalene sulfonates, norigenin sulfonates such as sodium ligninsulfonate, alkylaryl sulfonates, Anionic surfactants such as dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether sulfate ester salts, alkali metal salts of copolymers with carboxyl groups such as sodium salts of maleic acid and isobutylene copolymers, polyoxyethylene Examples include nonionic surfactants such as alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester. Further, a cationic surfactant, an amphoteric surfactant, etc. may be used as necessary.

These surfactants may be used alone or in a mixture of two or more in any proportion.

The amount of surfactant used in the herbicide of the present invention is usually 1 to 40%, preferably 3 to 20% based on the total weight.

Examples of the carbonate used in the herbicide of the present invention include sodium carbonate, potassium carbonate, lithium carbonate, ammonium carbonate, calcium carbonate, sodium sesquicarbonate, sodium bicarbonate, potassium bicarbonate, lithium bicarbonate, ammonium bicarbonate, and sesquicarbonate. Potassium, ammonium sesquicarbonate, etc. may be mentioned, and sodium hydrogen carbonate and sodium carbonate are particularly preferred. The above carbonates may be used alone or in combination of two or more in any proportion.

Examples of the water-soluble solid acids used in the herbicide of the present invention include citric acid, succinic acid, maleic acid, fumaric acid, tartaric acid, oxalic acid, malonic acid, malic acid, adipic acid, boric acid, and dihydrogen phosphate. Examples include sodium, potassium dihydrogen phosphate, but especially maleic acid, fumaric acid,
Citric acid, malic acid, boric acid and sodium dihydrogen phosphate are preferred. These may be used alone or in combination of two or more in any proportion.

The herbicide of the present invention optionally contains lactose, an average molecular weight of 60
Powdered water-soluble carriers such as 00 to 20,000 polyethylene glycol powder, and water-soluble polymers such as gum arabic, gum tragacanth, xanthan gum, methylcellulose, hydroxypropylcellulose, polyvinylpyrrolidone, polyvinyl alcohol, and soluble starch may also be added. .

When the herbicidal active ingredient is solid, the herbicidal herbicide of the present invention can be mixed with only the herbicidal active ingredient or with any or all of surfactants, carbonates, and water-soluble solid acids, and then dried using a jet miser, bottle mill, hammer mill, etc. It can be produced by grinding in a grinder and then mixing the remaining ingredients. If the herbicidal active ingredient is a liquid or has been made liquid by adding a solvent, the herbicidal active ingredient is absorbed into a powdered oil-absorbing carrier such as hydrated silicic acid, and then treated in the same manner as above. All you have to do is manufacture it.

Although the thus obtained powdered herbicide of the present invention may be used as it is, it is preferable to formulate it into granules or tablets from the viewpoint of handling, safety, environment, etc. The granules referred to herein are granules obtained by granulating a powdered agricultural chemical composition, and the shape thereof varies depending on the granulation method, and there are various shapes ranging from cylindrical and spherical to amorphous. In addition, tablets are manufactured by compressing an agricultural chemical composition into a certain shape, and the shape is a disc-shaped one with no dots.
There are various types such as those with corners, rounded corners, lens shapes with shallow to deep curvature, pillow shapes, almond shapes, finger shapes, triangles, squares, pentagons, capsule shapes, etc.

Granules are prepared by converting the powdered herbicide of the present invention into sheet-like, pillow-like granules or slugs using a dry granulator or slug machine such as a roller compactor or briquetting machine, and then processing this into a sheet-like, pillow-like granule or slug. It can be obtained by crushing or destroying it. When using a dry granulator, the powder composition is placed between rotating rolls and a pressure of 30 kg/ct or more, preferably 50 kg/cri or more is applied. Since this method does not use water, no carbon dioxide gas is generated during the manufacturing process, and sufficient foaming is observed when the granules are applied to rice fields.

The particle size of the above granules ranges from about 100 to 100 μm, preferably from about 4000 to 250 μm.

Tablets are obtained by placing a certain weight of the powder composition in a mortar and compressing it, but industrially, the above granules are used to tablet with a tabletting machine or a briquetting machine. By doing so, tablets of a constant weight can be obtained continuously.

The size of the tablet varies depending on the method of application, but is usually about 7 to 60 mm in diameter, about 1 to 40 mm thick, and weighs about 0.3 to 100 g, more preferably about 1 to 40 g.
It is in the range of 50g.

The herbicide of the present invention is applied to flooded drains.

The application amount of the herbicide of the present invention is not particularly limited, but is usually in the range of about 50 to 2000 g, preferably about 500 to 1000 g per 10 ares.

The herbicide of the present invention can be easily applied without using any special equipment.

For example, an applicator enters a rice field and applies it uniformly or to one part of the rice field.
The herbicide of the present invention can be applied to points above pressure points, applied to the sides of ridges or at the water mouths of paddy fields without entering the paddy field, or applied from the ridges to spread the active ingredient throughout the paddy field. . It is also possible to spray from the ridge with a power spreader (grainer), or from the air using a helicopter, a radio-controlled airplane, or the like.

By the way, in order for an effervescent preparation to achieve good diffusion on the water surface, appropriate wettability and rapid expansion and wetting are required, and the herbicide of the present invention satisfies these conditions.

When the herbicide of the present invention is applied to flooded drains, it generates carbon dioxide gas and moves, and the herbicidal active ingredient quickly and uniformly diffuses throughout the rice field, so it exhibits sufficient herbicidal effects against weeds in the rice field. It is also an excellent herbicide with little phytotoxicity. Also,
The herbicide of the present invention can be applied at a conventional application rate (for example, in the case of granules, 1O
Since the amount of application can be significantly reduced compared to 3,000 to 4,000 g per area, it has high utility value in terms of product manufacturing, transportation, storage, and labor-saving spraying.

<Examples> Next, the present invention will be explained in more detail with reference to formulation examples, comparative examples, and test examples, but the present invention is not limited to these examples.

In addition, parts in the formulation examples and comparative examples represent parts by weight.

First, a formulation example will be shown.

Formulation Example 1 Compound (1120 parts, REAX 85A (Westva
Sodium lignin sulfonate manufactured by Co., Ltd.) 18 parts, REAX
2 parts of 988B (lignosulfonic acid powder manufactured by West VaCO), 30 parts of sodium bicarbonate, and 30 parts of maleic acid were thoroughly mixed in a juice mixer, and then ground in a centrifugal grinder. Next, this was made into sheet-like granules using a roller compactor - TF-MINI type (Freund Sangyo Co., Ltd. shoe-type granulator) under a pressure of 50 kg/cd, and then crushed using a mortar and pestle. Diameter is 100
Granules were obtained by sizing the particles to a size of 0 to 297 μm.

Formulation Example 2 Same composition and same operation as Formulation Example 1, particle size 16
Granules of 80-1000 μm were obtained.

Formulation Example 3 Compound (1) 20 parts, REAX@85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAXL988B, 20 parts of sodium bicarbonate, and 40 parts of maleic acid to obtain granules with a particle size of 1000 to 297 μm.

Formulation Example 4 Compound (1) 20 parts, REAX 85A 18 parts, R
The same operation as in Formulation Example I was carried out using 2 parts of EAX 88B, 40 parts of sodium hydrogen carbonate, and 20 parts of maleic acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 5 Compound (1) 20 parts, REAX ■85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX088B, 30 parts of sodium carbonate, and 30 parts of maleic acid.
Granules having a particle size of 1000 to 297 μm were obtained.

Formulation Example 6 Same composition and same operation as Formulation Example 5, particle size 16
Granules of 80-1000 μm were obtained.

Formulation Example 7 Compound (1120 parts, REAX 85A 9 parts, REA
Perform the same operation as in Formulation Example 1 using 1 part of X088B, 35 parts of sodium hydrogen carbonate and 35 parts of maleic acid,
Granules having a particle size of 1000 to 297 μm were obtained.

Formulation Example 8 20 parts of compound (1120 parts, 5orpol 5060 (Toho Chemical Co., Ltd. spray-dried product containing sodium dodecylbenzenesulfonate and powdered hydrated silicic acid in l:1), 30 parts of sodium hydrogen carbonate, and 30 parts of maleic acid) The same operation as in Formulation Example 1 was performed using granules having a particle size of 1000 to 297 μm.

Formulation Example 9 Compound (1120 parts, GEROPON@5C-211 (
The same operation as in Formulation Example 1 was carried out using 20 parts of sodium salt of a copolymer having a carboxyl group (manufactured by O-Ne Boulin), 30 parts of sodium carbonate, and 30 parts of maleic acid, and a Granules were obtained.

Formulation Example 1O 20 parts of compound (1), MOWET@D425 (DESO
Formalin condensate of sodium naphthalene sulfonate manufactured by TC1) 20 parts, sodium carbonate 30 parts and maleic acid 3
The same operation as in Formulation Example 1 was performed using 0 parts, and the particle size was 10 parts.
Granules with a diameter of 00 to 297 μm were obtained.

Formulation Example 11 Compound (1120 parts, REAX 85A 18 parts, R
The same operation as in Formulation Example 1 was carried out using 2 parts of EAX 88B, 30 parts of Niscalon #1500 (calcium carbonate manufactured by Nitto Funka Co., Ltd.) and 30 parts of maleic acid to form granules with a particle size of 1000 to 297 μm. Obtained.

Formulation Example 12 Compound (1120 parts, REAX 85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX088B, 20 parts of sodium bicarbonate, 20 parts of maleic acid, and 20 parts of lactose to obtain granules with a particle size of 1000 to 297 μm.

Formulation Example 13 Compound (1120 parts, REAX@85A 18 parts, R
The same operation as in Formulation Example 1 was carried out using 2 parts of EAX 88B, 15 parts of sodium bicarbonate, 15 parts of maleic acid and 30 parts of lactose to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 14 Formulation Example 1 was prepared using 20 parts of compound (1), 18 parts of REAX 85A, 2 parts of REAX088B, 10 parts of sodium bicarbonate, 10 parts of maleic acid, and 40 parts of lactose.
The same operation as above was performed to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 15 Compound (1) 20 parts, REAX■85A 18 parts, REA
The same operation as in Formulation Example 1 was performed using 2 parts of X088B, 30 parts of sodium carbonate, and 30 parts of fumaric acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 16 Compound (1) 20 parts, REAX■85A 18 parts, REA
2 parts of X88B, 30 parts of sodium carbonate and DL-
Perform the same operation as in Formulation Example 1 using 30 parts of malic acid,
Granules having a particle size of 1000 to 297 μm were obtained.

Formulation Example 17 Compound (1) 20 parts, REAX@85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX 88B, 30 parts of sodium carbonate, and 30 parts of succinic acid to obtain granules having a particle size of 100 to 297 μm.

Formulation Example 18 Compound (1) 20 parts, REAX ■85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX 88B, 30 parts of sodium carbonate, and 30 parts of sodium dihydrogen phosphate trihydrate to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 19 Compound (1150 parts, REAX 85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX 88B, 15 parts of sodium bicarbonate, and 15 parts of maleic acid to obtain granules having a particle size of 100.0 to 297 μm.

Formulation Example 20 20 parts of compound (1), 0.12 parts of compound (20), RE
The same operation as in Formulation Example 1 was performed using 18 parts of AX■85A, 2 parts of REAX■88B, 30 parts of sodium hydrogen carbonate, and 29.88 parts of maleic acid, and the particle size was 1000.
Granules of ~297 μm were obtained.

Formulation Example 21 1 g of the granules obtained in Formulation Example 1 was placed in a tablet molding machine with a diameter of 20 arms and compressed at a pressure of 100 kg/car to obtain tablets.

Formulation Example 22 375 mg of the granules obtained in Formulation Example 7 were placed in a tablet molding machine with a diameter of 10 mm and compressed at a pressure of 100 kg/ci to obtain tablets.

Formulation Example 23 3 g of the granules obtained in Formulation Example 9 were placed in a tablet molding machine with a diameter of 30 mm and compressed at a pressure of 500 kg/ctd to obtain tablets.

Formulation Example 24 The granules obtained in Formulation Examples 1 and 2 were mixed at a ratio of 1:1,
5 g of this mixture was placed in a tablet molding machine with a diameter of 30 [1II11] and compressed at a pressure of 500 kg/+ffl to obtain tablets.

Formulation Example 25 Compound (1120 parts, REAX ■85A 13.5 parts, R
EAX088B1.5 part, GEROPON 5C-2
1 part 5 parts, 30 parts sodium carbonate and 30 parts maleic acid
The same operation as in Formulation Example I was carried out using
Granules with a size of 0 to 297 μm were obtained.

Formulation Example 26 Compound (4) 28 parts, GEROPON 5C-21
The same operation as in Formulation Example 1 was performed using 110 parts of REAX[F]85A, 2 parts of sodium carbonate, and 30 parts of maleic acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 27 Compound (27) 32 parts, GEROPONO3C-211
The same operation as in Formulation Example 1 was performed using 5 parts of MOWET D425, 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1000 to 1000.
Granules of 297 μm were obtained.

Formulation Example 28 Compound (1110 parts, Compound (28) 0.24 parts, R
EAX@85A 18 parts, Demol ■EP (Kao (f
The same operation as in Formulation Example 1 was performed using 1.76 parts of carboxylic acid surfactant manufactured by A), 40 parts of sodium carbonate, and 30 parts of maleic acid to obtain granules having a particle size of 1680 to 297 μm.

Formulation Example 29 Compound (1) 7.5 parts, Compound (28) 0.18 parts,
REAX■85A Part 18, Demol ■EP4.32
The same operation as in Formulation Example 1 was carried out using 45 parts of sodium bicarbonate, 45 parts of sodium hydrogen carbonate, and 25 parts of maleic acid, and the particle size was 1680 parts.
Granules of ~297 μm were obtained.

Formulation example 30 The same operation as in the formulation example was performed using 20 parts of compound (1), 20 parts of REAX 85A, 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1000 to 297μ.
Granules of m were obtained.

Formulation Example 31 Same composition and same operation as Formulation Example 30, particle size 4.
Granules with a size of 000 to 3360 μm were obtained.

Formulation Example 32 Same composition and same operation as Formulation Example 30, particle size was 3.
Granules of 360-2800 μm were obtained.

Formulation Example 33 Same composition and same operation as Formulation Example 30, particle size 2.
Granules of 800-2380 μm were obtained.

Formulation Example 34 Same composition and same operation as Formulation Example 30, particle size 2.
Granules of 380-2000 μm were obtained.

Formulation Example 35 Same composition and same operation as Formulation Example 30, particle size 2.
Granules with a size of 000 to 1680 μm were obtained.

Formulation Example 36 Same composition and same operation as Formulation Example 30, particle size 2.
Granules with a size of 000 to 1000 μm were obtained.

Formulation Example 37 Same composition and same operation as Formulation Example 30, particle size 1.
Granules of 680-500 μm were obtained.

Formulation Example 38 20 parts of compound (1), 20 parts of REAX 85A, 25 parts of sodium carbonate, 25 parts of maleic acid, and 10 parts of lactose
The same operation as in Formulation Example 1 was carried out using
Granules with a size of 0 to 297 μm were obtained.

Formulation Example 39 Compound (1120 parts, REAX 85A 20 parts, sodium carbonate 20 parts, maleic acid 20 parts and lactose 20 parts)
The same operation as in Formulation Example 1 was carried out using
Granules with a size of 0 to 297 μm were obtained.

Formulation Example 40 Compound (1120 parts, REAX 85A 10 parts, sodium carbonate 30 parts, maleic acid 30 parts and lactose 10 parts)
The same operation as in Formulation Example I was carried out using
Granules with a size of 0 to 297 μm were obtained.

Formulation Example 41 The same operation as Formulation Example 1 was performed using the compound (1120 parts, 5 parts of REAX@85A, 30 parts of sodium carbonate, 30 parts of maleic acid, and 15 parts of lactose, and the particle size was 1000 parts.
Granules of ~297 μm were obtained.

Formulation Example 42 20 parts of compound (1), POLYFON H (Westv
The same operation as in Formulation Example 1 was performed using 20 parts of sodium lignin sulfate (manufactured by aco), 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1000 to 297μ.
Granules of m were obtained.

Formulation Example 43 20 parts of compound (1), REAX ■83A (Westva
The same operation as in Formulation Example 1 was performed using 20 parts of sodium lignin sulfate (manufactured by Co., Ltd.), 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1000 to 297 μm.
granules were obtained.

Formulation Example 44 The same operation as Formulation Example 1 was performed using 20 parts of Compound (1), 20 parts of REAX088B, 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1000 to 297μ.
Granules of m were obtained.

Formulation Example 45 Compound (1) 20 parts, RF, AXo85A 9 parts, REAX088B 1 part, GEROPON 5C-
The same operation as in Formulation Example 1 was performed using 21110 parts of sodium carbonate, 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was 1.
Granules of ooo~297 μm were obtained.

Formulation Example 46 Compound (1120 parts, REAX 85A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX088B, 30 parts of sodium carbonate, and 30 parts of citric acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 47 Compound (1) 20 parts, REAX ■85A 18 parts, R
The same operation as in Formulation Example 1 was carried out using 2 parts of EAX 88B, 30 parts of sodium carbonate, and 30 parts of phosphoric acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 48 Compound (1) 20 parts, REAX ■85A 13.5 parts, R
EAX■88B1.5 part, Dispersant@GN
The same operation as in Formulation Example 1 was carried out using 5 parts of sodium phenylsulfonate powder (70% sodium phenylsulfonate manufactured by O-ne Boulin), 30 parts of sodium carbonate, and 30 parts of maleic acid to form granules with a particle size of 1000 to 297 μm. I got it.

Formulation Example 49 20 parts of compound (1), MOWET■EFW (DESOT
The same operation as in Formulation Example 1 was performed using 20 parts of surfactant (manufactured by Company O), 30 parts of sodium carbonate, and 30 parts of maleic acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 50 Formulation Example 1 was prepared using 20 parts of Compound (1), 20 parts of Demol EP, 30 parts of sodium carbonate, and 30 parts of maleic acid.
The same operation as above was performed to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 51 Compound (), 120 parts, 5orpol@5029-o(
Surfactant (manufactured by Toho Chemical) 20 parts, sodium carbonate 30 parts
The same operation as in Formulation Example 1 was performed using 30 parts of maleic acid and 30 parts of maleic acid to obtain granules having a particle size of 1000 to 297 μm.

Formulation Example 52 The same operation as in Formulation Example 1 was performed using 20 parts of Compound (1), 20 parts of 5orpol 5073 (surfactant manufactured by Toho Chemical), 30 parts of sodium carbonate, and 30 parts of maleic acid, and the particle size was Granules of 1000-297 μm were obtained.

Next, a comparative example will be shown.

Comparative Example 1 4 parts of Compound (1), 4 parts of 5orpol@50604 parts, 30 parts of bentonite, and 62 parts of calcium carbonate were mixed in a juice mixer and pulverized in a centrifugal pulverizer. Then, 15 parts of water was added to this mixture and kneaded using a mortar and pestle.
, granulated using an extrusion granulator equipped with a 9 mm screen, sized, dried at 60°C for tO to 168
Granules with a size of 0 to 297 μm were obtained.

Comparative Example 2 Compound +1120 parts, REAX■55A 18 parts, R
The same operation as in Formulation Example 1 was performed using 2 parts of EAX058B, 5 parts of sodium bicarbonate, 5 parts of maleic acid, and 50 parts of lactose to obtain granules with a particle size of 1000 to 297 μm.

Comparative Example 3 Compound +1) 20 parts, TWEEN■20 (polyoxyethylene (20) sorbitan monolaurate) 5 parts, Toxil GUN (Tokuyama Soda 3 Co., Ltd.) hydrated silicic acid) 5 parts,
Perform the same operation as in Formulation Example 1 using 18 parts of sodium hydrogen carbonate, 2 parts of maleic acid and 50 parts of bentonite,
Granules having a particle size of 1000 to 297 μm were obtained.

Comparative Example 4 5 parts of compound (1), 30 parts of bentonite, and 30 parts of clay were mixed in a juice mixer and centrifugally pulverized. 10 parts of citric acid and 20 parts of sodium hydrogen carbonate were added to this and mixed using a juice mixer. Thereafter, 5 parts of Eyarol CT-1 (70% purity solution of dioctyl sulfosuccinate manufactured by Toho Chemical Co., Ltd.) and 20 parts of water were added to this mixture, and the mixture was kneaded using a mortar and pestle. After granulating with an extrusion granulator equipped with a screen and grading, 60
It was dried for 110 minutes at °C to obtain granules with a particle size of 1680 to 297 μm.

Comparative Example 5 Compound (1) 5 parts, bentonite 50 parts, citric acid 20
The same operation as in Formulation Example I was carried out using 20 parts of sodium carbonate, 20 parts of Dispersant GN, and granules having a particle size of 1000 to 297 μm were obtained.

Comparative Example 6 The same operation as in Formulation Example 1 was performed using the compound (1120 parts, 30 parts of sodium carbonate, 30 parts of maleic acid, and 20 parts of Katsukoyama SP clay (Rouseki manufactured by Katsukoyama Mining Co., Ltd.), and the particle size was 1000. Granules of ~297 μm were obtained.

Comparative Example 7 The same operation as in Formulation Example 1 was performed using 11,100 parts of the compound to obtain granules with a particle size of 1,000 to 297 μm.

Next, a test example is shown.

Test Example 1 As shown in Fig. 1, the height is 35cm and the width is 53cm.
Three partition plates were placed in an aluminum vat, and 71 liters of ion-exchanged water was placed in the vat.

Next, a test composition was added so that the amount of active ingredient was equivalent to 100 g/10a, and the distance traveled by the composition was visually observed. Also, after 24 hours of loading, the distance from the loading position is 0cm187.
cra and 174 cm, and at a point approximately 0.5 cm from the bottom of the aluminum vat, the liquid 25- was collected with a whole pipette, and after evaporating the water, the amount of active ingredient was determined by gas chromatography (detector + ECD). I asked for it.

The results are shown in Table 1.

Table 1 [Evaluation criteria for diffusivity] Movement distance: 2 m or more, 1 m or more, less than 2 m, 50 cm or more, less than 1 m, less than 50 crn. From Table 1, the herbicide of the present invention has the following total amount of carbonate and water-soluble solid acid: It is clear that the dispersibility is superior to formulations with a small amount of carbon dioxide or formulations using mineral carriers.

Test Example Soil mixed with seeds of dogfish was sown in a rice field measuring 10 m long and 5 m wide, and then paddy rice was transplanted in parallel to the sides. After 9 days, the test composition was treated from the ridge so that the amount of active ingredient was equivalent to 100 g/lOa. On the 35th day after the chemical treatment, the occurrence of dog fireflies and chemical damage to the rice plants were visually observed. No phytotoxicity of rice was observed in any of the test compositions.

The herbicidal efficacy results are shown in Figure 2.

(Judgment criteria for herbicidal effect) Highly effective A Insufficient effect B No effect C Test example 3 In a 5m x 5m paddy field, seeds of dogfish (Konjin soil) were sown, and paddy rice was transplanted.After 9 days, the amount of active ingredient was 100g/
The test composition was applied to the center of the rice field in an amount equivalent to 1Oa. On the 35th day after the chemical treatment, the occurrence of dog fireflies and chemical damage to the rice plants were visually observed. No phytotoxicity of rice was observed in any of the test compositions.

The herbicidal efficacy results are shown in Figure 3. (Evaluation criteria are test example 2
Same as. ) Test Example 4 The powder obtained after centrifugal pulverization in Formulation Example 1 and the granules obtained in Formulation Example 1 were each subjected to a rotary tablet press (
The tablets were continuously compressed using a 16 mm diameter (manufactured by Kikusui Seisakusho Co., Ltd.). The weight of each of the 20 tablets obtained was measured, and the coefficient of variation was determined.

The results are shown in Table 2.

Table 2 Test Example 5 Preparation amount in the aluminum vat used in Test Example 1: 750g/]
, Oa, and the distance traveled by the composition was visually observed.

The results are shown in Table 3. (The evaluation criteria for diffusivity are the same as Test Example 1.) Table 3 Test Example 6 The amount of formulation in the aluminum vat used in Test Example 1 was 1 kg/10.
The test composition was added in an amount equivalent to a, and the distance traveled by the composition was visually observed.

The results are shown in Table 4. (Evaluation criteria for diffusivity are the same as in Test Example 1.) Table 4 Test Example 7 Paddy rice was transplanted into a paddy field measuring 48 m in length and 1 in width. Next, Japanese firefly at the 1 to 1.5 leaf stage was transplanted from the center of the side and from a point 3 m left and right from the center in a direction parallel to the vertical side. After 3 days, the amount of active ingredient is 70g/10a
The test composition of Formulation Example 25 was applied to the water spout from the center of each side (the water spout was closed after 15 minutes).

). 42 days after chemical treatment, hidden herbicidal effects and chemical damage were visually observed.

No remaining grass of the Japanese firefly was observed in the test area. In addition, no chemical damage to rice was observed.

Test Example 8 The test compositions formulated in the Formulation Examples and Comparative Examples were ground with a centrifugal grinder, and 3 g of the powder was placed in a tablet molding machine with a diameter of 30+ nm, and the tablets were compressed at a pressure of 50 kg/cnf to obtain tablets. Ta. This tablet was placed on the data table of a contact angle meter (Kyowa Interface Science (horizontal type CA-A)), a droplet of ion-exchanged water was dropped on it, and the condition of the droplet was photographed with a camera immediately after dropping and 60 seconds later. The contact angle was measured.The results are shown in Table 5.

Note that the contact angle immediately after dropping is θ. , the contact angle after 60 seconds is 0.
Expressed in 6 degrees.

(It is preferable that θ is 130° or less, and θ6°/θ is 0.9 or less.) Table 5 Test Example 9 A power spreader (Yanmar (horizontal FS60 (S)-FS 26 type)
The test composition was sprayed in an amount equivalent to 1 kg/10a using a.

Table 6 shows the distribution of the test compositions.

Table 6 4゜<Effects of the Invention> The herbicide of the present invention has excellent dispersibility in flooded sewage paddy fields compared to conventional formulations, and is a useful herbicide that can be applied in various labor-saving ways. be.

[Brief explanation of the drawing]

FIG. 1 is a top view of the aluminum bat used in Test Examples 1 and 5. Three partition plates were inserted so that they were parallel to the long walls of the bat. The gap between the partition plate and the short wall is 9 cm. X is the injection position of the test composition. FIG. 2 shows the results of Test Example 2. The herbicidal effects of each section of the rice field, which was divided into 30 equal sections, are shown as A, B, and C. represents the treatment location of the test composition. FIG. 3 shows the results of Test Example 3. The herbicidal effects of each section of the rice field, which was divided into 15 equal parts, are shown as A, B, and C. Figure 1 Figure 2 Formulation Example 1 Formulation Example 2 Comparative Example 1 Figure 3 Formulation Example 1 Formulation Example 2 Comparative Example 1 Procedural Amendment

Claims (1)

[Claims] (1) Contains a herbicidal active ingredient, a surfactant, a carbonate, and a water-soluble solid acid, the total weight of the carbonate and the water-soluble solid acid is 20 to 85% of the total weight, and the carbonate and a water-soluble solid acid in a weight ratio of 1:5 to 5:1.