JP3258053B2 - Paddy field herbicide composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a herbicidal composition,
In particular, the present invention relates to a paddy field herbicide composition suitable for controlling weeds generated in flooded paddy fields.

[0002]

2. Description of the Related Art Conventionally, the formulation of herbicides used in flooded paddy fields includes granules, wettable powders, emulsions and the like. In general, a method of spraying granules, and a stock solution of an emulsion before rice transplantation are used. A method of spraying, or a method of diluting an emulsion or wettable powder with a large amount of water and spraying is used. Recently, a method of directly dropping and spraying a suspension-stabilized flowable agent using water as a dispersion medium has been developed.

[0003] Spraying of granules is most frequently employed because of its relative ease. Formulation of granules is carried out by mixing and pulverizing the herbicidally active compound with a fine powder carrier such as bentonite, talc, clay, or the like, and then passing through a granulation step, or adding a herbicidally active compound to a granular carrier obtained by granulating the fine powder carrier. There are various methods such as uniformly mixing and adsorbing compounds.

[0004] In order to uniformly apply the granules to the paddy field, a certain amount is required, and at present, 3 to 4 per 10 ares is required.
Kg is sprayed. Spraying is based on manual or granulators that enter the paddy field. Also, because of the necessity of uniform spraying and work in paddy fields, a lot of labor is spent on spraying granules.

[0005] For the emulsion, a method of spraying an undiluted solution before planting rice is used. This method is as simple as spraying granules, but has the drawback that spraying after rice planting causes serious harm to paddy rice caused by the organic solvent contained in the emulsion. Therefore, the application of the emulsion can be applied only before rice transplanting. In addition, the application of the emulsion and the flowable agent is also labor and cost due to the fact that the emulsion is also sprayed into the paddy field, or attached to a tractor or the like to drop the undiluted solution.

The method of diluting an emulsion or powdered wettable powder with a large amount of water and spraying the same involves diluting the drug into water of about 50 to 100 l per 10 ares, and requires a great deal of labor when spraying.

As described above, the methods of spraying herbicides conventionally applied to flooded paddy fields all have various problems.

[0008]

DISCLOSURE OF THE INVENTION The present inventors consider that 3N-
(2-fluoro-4-chloro-5-cyclopentyloxyphenyl) -5-isopropylidene-1,3-oxazolidine-
2,4-dione and 1- (2-chlorobenzyl) -3- (α, α-
It has the herbicidal effect of the herbicidally active compound as well as the method of spraying granules, emulsions, wettable powders or flowables in a paddy field flooded with a mixture of the herbicidally active compounds of dimethylbenzyl) urea. As a result of intensive studies to develop a herbicide composition that can be sprayed more easily than a method of spraying an emulsion, a wettable powder or a flowable, the present invention was completed.

[0009]

That is, the present invention provides the following:
N- (2-fluoro-4-chloro-5-cyclopentyloxyphenyl) -5-isopropylidene-1,3-oxazolidine-2,4-dione and 1- (2-chlorobenzyl) -3- (α,
α-Dimethylbenzyl) urea herbicidally active compound, surfactant, paddy field herbicide component containing a carrier such as clay mineral, etc., and an effervescent component containing a carbonate and an organic acid and a stabilizer are blended into a tablet. It is a paddy field herbicide composition characterized by being molded.

The herbicidal composition of the present invention is used after being formed into tablets. By throwing this tablet directly into the paddy field,
The carbonate contained in the tablet and the organic acid react with each other to generate carbon dioxide gas, and the herbicidal active compound diffuses widely into the paddy water due to its foaming power, thereby exhibiting a sufficient herbicidal effect. Spraying is very simple, and a sufficient herbicidal effect can be expected by throwing the tablets from the ridge of the paddy field without entering the paddy field.

The proportion of the herbicidally active compound of the present invention is not particularly limited, but is preferably 3N- (2-fluoro-4-chloro-5-cyclopentyloxyphenyl) -5-isopropylidene-1,3-oxazolidine. -2,4-dione (hereinafter referred to as
Described as compound “A”. 1) 1 part by weight of 1- (2-chlorobenzyl) -3- (α, α-dimethylbenzyl) urea (hereinafter referred to as compound “B”) is suitably 0.5 to 20 parts by weight. In addition, the amount of each active ingredient to be adjusted into a tablet varies depending on the application scene, application time, application method, and the target weed, but the compound “A” is the active ingredient amount per 10 ares,
Generally, 5 to 500 g, preferably 10 to 250 g, compound "B" is generally 10 to 1000 g, preferably 20 to 500 g.
Is appropriate.

The surfactant used is not particularly limited.
What is conventionally used in the field of agricultural chemicals is used.

Examples of the clay mineral include calcium carbonate, diatomaceous earth, talc, clay, siegrite, bentonite, white carbon, acid clay and the like. Clay minerals have an effect of improving the hydratability of the herbicide composition, improving the diffusibility in paddy water, and preventing the herbicide active compound from solidifying during pressure molding.

The carbonate used in the herbicidal composition of the present invention includes dried sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, potassium carbonate, potassium hydrogen carbonate, ammonium carbonate and the like. The content of the carbonate is from 5 to 80% by weight, especially from 10 to 80% by weight based on the total weight of the composition.
50% by weight is preferred.

The organic acids include dried citric acid, tartaric acid, malic acid, malonic acid, pyridonecarboxylic acid, succinic acid, adipic acid, fumaric acid, phosphoric acid, sodium citrate, sodium succinate, sodium fumarate And sodium phosphate. The content of the organic acid is preferably from 10 to 300% by weight, particularly preferably from 30 to 150% by weight, based on the weight of the carbonate coexisting in the herbicide composition.

As the stabilizer, polyethylene glycol, polyvinylpyrrolidone, hydroxycellulose,
Water-soluble polymers such as polyvinyl alcohol, soluble starch, dextrin and the like can be mentioned. The compounding amount is suitably from 0.1 to 30% by weight based on the total weight of the composition. The stabilizers are used alone or in combination of two or more. The stability of the herbicidal active ingredient to carbonates and organic acids by the stabilizer, the stability of the foaming components of carbonates and organic acids,
The storage stability of the tablet is significantly improved.

The method for producing the paddy field herbicidal composition of the present invention is as follows. The herbicidally active compounds of compound "A" and compound "B" and a carrier such as a surfactant and a clay mineral are mixed and pulverized by an air mill or a hammer mill. A tableting machine in which a wettable powder of a herbicidally active compound, a foaming composition such as a carbonate and an organic acid finely pulverized by an air mill or a hammer mill, and a water-soluble polymer finely pulverized by an air mill or a hammer mill are mixed with a tableting machine. Or a method of obtaining tablets by molding with a molding machine or the like,
Or a method of obtaining a tablet by mixing and pulverizing a herbicidally active compound, a surfactant, a clay mineral, or the like, a carbonate, an organic acid, or a water-soluble polymer with an air mill or a hammer mill, and molding with a tableting machine or a molding machine. Alternatively, a method in which a herbicidally active compound, a carbonate, an organic acid, or the like is coated in advance with a water-soluble polymer compound such as polyethylene glycol, or is blended and molded, may be mentioned.

The herbicidal composition of the present invention is suitable as a formulation for spraying herbicides on submerged paddy fields after shaving and after rice transplanting.

The herbicidal composition of the present invention can be sprayed easily and easily by throwing a tablet of the herbicidal composition from the ridge of a paddy field, and can be compared with an emulsion for spraying an undiluted solution or a flowable agent before rice transplantation. The herbicidal effect can be exhibited to the extent not inferior.

On the other hand, it is necessary to apply the granules and the like in the paddy field and to apply them evenly. In this case, the labor is enormous, and the composition of the present invention requires much less labor. Can be.

The amount of the herbicidal composition used in the present invention is
Although there is no particular limitation, the composition is preferably 200 to 3000 g, and more preferably 200 to 1000 g per 10 ares. The size of the tablets to be sprayed is 1 to 100 per tablet.
g, more preferably 10 to 50 g. The number of tablets to be sprayed per 10 ares is preferably 5 to 500, and more preferably 10 to 200.

[0022]

EXAMPLES Next, formulation examples of the paddy field herbicide composition of the present invention,
A test example will be described. In the formulation examples and test examples, "parts" indicates parts by weight.

Formulation Example 1 9 parts of compound "A", 30 parts of compound "B", 16 parts of surfactant Lipolane PB-800 (registered trademark of Lion Co.) and clay mineral kaolin clay MC (Sigleite Industry Co., Ltd.)
Was mixed and pulverized to obtain a wettable powder. Then, 28 parts of this wettable powder, 20 parts of succinic acid, 15 parts of sodium hydrogen carbonate, 5 parts of sodium carbonate and 2 parts of polyethylene glycol (average molecular weight: 6000), which have been finely ground in advance, are mixed, and the mixture is molded into a cylindrical shape. It was added to the container and pressurized at a pressure of 400 kg / cm ² to obtain a tablet having a diameter of 3.5 cm and 35 g.

Formulation Example 2 9 parts of compound "A", 30 parts of compound "B", 10 parts of surfactant Lipolane PB-800, clay mineral kaolin clay MC
41 parts and polyethylene glycol (average molecular weight: 6000)
The mixture was pulverized together with 10 parts to obtain a wettable powder. Then, 50 parts of this wettable powder, 25 parts of succinic acid, pulverized in advance, 20 parts of sodium hydrogencarbonate and 5 parts of polyethylene glycol (average molecular weight: 6000) were mixed, and the mixture was prepared in the same manner as in Preparation Example 1 to give a diameter of 3.5. cm, 50 g tablets were obtained.

Formulation Example 3 9 parts of compound "A", 30 parts of compound "B", 10 parts of surfactant Lipolane PB-800, and clay mineral kaolin clay M
C71 parts were mixed and pulverized to obtain a wettable powder. Also, 90 parts of succinic acid and 10 parts of polyethylene glycol (average molecular weight: 6000) are mixed, heated to 75 ° C., stirred and dissolved, and then cooled and pulverized to obtain a powdery pretreated product. Was. This pretreatment 24
Part, pulverized product of sodium hydrogen carbonate finely pulverized in advance
After mixing 16 parts and 60 parts of the above wettable powder, the mixture was prepared in the same manner as in Preparation Example 1 to obtain a tablet having a diameter of 3.5 cm and a weight of 50 g.

Formulation Example 4 9 parts of compound "A", 30 parts of compound "B", 10 parts of lipolan PB-800 surfactant, clay mineral kaolin clay MC
41 parts and 10 parts of soluble starch were mixed and pulverized to obtain a wettable powder. Also, 90 parts of succinic acid and 10 parts of polyethylene glycol (average molecular weight: 6000) are mixed, heated to 75 ° C., stirred and dissolved, and then cooled and pulverized to obtain a powdery pretreated product. Was. After mixing 25 parts of the pretreated product, 15 parts of a previously finely ground pulverized product of sodium hydrogen carbonate, 5 parts of sodium carbonate, 5 parts of anhydrous sodium sulfate and 50 parts of the above wettable powder,
It was prepared in the same manner as in Preparation Example 1 to obtain a tablet having a diameter of 3.5 cm and a weight of 50 g.

Formulation Example 5 4.5 parts of compound "A", 15 parts of compound "B", 4 parts of ethylene glycol, 0.5 part of xanthan gum, 5 parts of surfactant Solpol 3940 (registered trademark of Toho Chemical Co., Ltd.), surfactant Lunox 1000C (registered trademark of Toho Chemical Co., Ltd.)
One part and 70 parts of water were mixed well and wet-pulverized until the particle size became 5 μm or less to obtain a flowable agent.

Formulation Example 6 1.5 parts of the compound "A", 5 parts of the compound "B", 60 parts of talc, 30.5 parts of bentonite, and 3 parts of ligninsulfonic acid are sufficiently pulverized and mixed, and water is added. The mixture was granulated with a granulator and dried to obtain granules.

Formulation Example 7 4.5 parts of compound "A", 15 parts of compound "B", 75.5 talc
Parts, 3 parts of surfactant Solpol 800A and 2 parts of alkylaryl sulfonate were mixed and pulverized to obtain a wettable powder.

Test Examples 1 to 7 After paddy fields were plowed and plowed, seeds of various paddy field weeds were sown, and tubers of water flies were transplanted. Then, a 2.5-leaf rice plant (variety: Koshihikari) was transplanted using a rice transplanter. After rice planting, 50m ² (10 × 5
m). The next day, 3-5 cm of water was immersed. A predetermined amount of each drug was treated 3 days after rice transplantation. The treatment was performed for each drug by the method described below.

Test Examples 1 to 4 (herbicide composition [tablets]) One tablet prepared in each of Preparation Examples 1 to 4 was thrown at approximately the center of the test plot per test plot. (Each herbicide bulk application rate is
45 g of compound "A" and 150 g of compound "B" per 10 ares)

Test Example 5 (Floable Agent) A predetermined amount of the flowable agent prepared in accordance with Formulation Example 5 was sprayed on the water surface so as to be almost equally spaced. (The herbicide bulk application rate is 45 g of compound "A" and 10 g of compound "B" per 10 ares.
150g)

Test Example 6 (Granules) A predetermined amount of granules prepared in accordance with Formulation Example 6 was evenly sprayed on the surface of a paddy field at substantially equal intervals. (The herbicide bulk application rate is 45 g of compound “A” and 150 g of compound “B” per 10 ares.
g)

Test Example 7 (Wettable powder) A predetermined amount of the wettable powder prepared according to Formulation Example 7 was diluted with 2.5 liters of water (corresponding to 50 liters in terms of the amount sprayed per 10 ares). The entire surface was dropped. (The herbicide bulk application rate is 45 g of compound “A” and 150 g of compound “B” per 10 ares.
g)

Each chemical treatment maintained a flood depth of 3-5 cm. One month after the chemical treatment, the herbicidal effect and the phytotoxicity on the rice were evaluated by observation. The herbicidal effect and the phytotoxicity of rice were determined according to the criteria in Tables 1 and 2. Table 3 shows the herbicide drug substance content in the preparation and the amount of application in each test example, and Table 4 shows the herbicidal effect 3 days after transplantation of the paddy rice.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

[Table 4]

[0040]

According to the test examples, when the paddy field herbicide composition of the present invention is used, herbicidal effects equivalent to those of granules, wettable powders and flowables are exhibited. In addition, the amount of spray per 10 ares can be reduced as compared with granules that spray 3 to 4 kg per 10 ares and wettable powders that are diluted and sprayed with 50 to 100 l of water per 10 ares. Moreover, the spraying method is simple and the labor required for spraying is significantly reduced. Also transport,
It is also advantageous in terms of storage.

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification symbol FI A01N 25/34 A01N 25/34 C // (A01N 43/76 (A01N 43/76 47:28) 47:28) (72) Inventor Shumitsu Shindo 2470 Handa, Shibukawa-shi, Gunma, Japan Central Research Laboratory (72) Inventor Kaoru Hiragata 2470 Handa, Shibukawa-shi, Gunma Japan, Central Research Laboratory Japan Carlit Co., Ltd. (56) References JP-A-5-139920 (JP, A) JP-A-3-173802 (JP, A) JP-A-62-167713 (JP, A) JP-A-60-116607 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) A01N 47/28 A01N 43/76

Claims (1)

(57) [Claims] (1) 3N- (2-fluoro-4-chloro-5)
-Cyclopentyloxyphenyl) -5-isopropylidene-1,3-oxazolidine-2,4-dione and 1-
(2-chlorobenzyl) -3- (α, α-dimethylbenzyl) urea as a herbicidally active compound, a surfactant and a paddy herbicide component containing a clay mineral, a foaming component containing a carbonate and an organic acid, and A paddy herbicide composition comprising a stabilizer and being formed into a tablet.