JPH04327504A - Paddy herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a foamable composition promising adequate herbicidal effect by simply throwing from paddy levee into a paddy without the need for entering the paddy, by incorporating a herbicidally active compound with a foamable composition containing both carbonate and organic acid. CONSTITUTION:The objective composition can be obtained, in the form of tablets, by molding following incorporating (A) a hydrating agent for the herbicidally active compound prepared by mixing a herbicidally active compound, surfactant and carrier such as clay mineral followed by grinding using e.g. an air mill or hammer mill with (B) a foamable composition containing (1) a carbonate (e.g. sodium bicarbonate, sodium carbonate, potassium carbonate, at 10-50wt.% based on the whole composition) pulverized with an air mill or hammer mill and (2) an organic acid (e.g. citric acid, tartaric acid, malic acid, at 30-150wt.% based on the whole composition). The present tablets can be applied easily, in particular, being applicable to paddy filled with water. By directly throwing the present tablets into a paddy, the carbonate and organic acid in the tablets will react with each other to form carbon dioxide, and the resulting foaming power will diffuse the herbicidally active compound over a wide range of the paddy surface water, thus giving adequate herbicidal effect.

Description

Description: [0001] The present invention relates to a herbicidal composition, and more particularly to a paddy herbicide composition suitable for controlling weeds that grow in flooded rice fields. [0002] Conventionally, the formulation forms of herbicides used in flooded sewage paddy fields are generally a method of spraying granules, a method of spraying an undiluted solution of an emulsion before rice planting, or a method of spraying an emulsion,
The method used is to dilute a wettable powder with a large amount of water and then spray it. Furthermore, recently, a method has been developed in which an aqueous suspension preparation stabilized using water as a dispersion medium is directly dripped and sprayed. The method of distributing granules is the most commonly used method because it is relatively easy. To formulate the granules used in this method, the herbicidally active compound is mixed and pulverized with a fine powder carrier such as bentonite, talc, clay, etc., and then a granulation process is performed, or the fine powder carrier is granulated. There are various methods, such as a method in which a herbicidally active compound is uniformly mixed into a granular carrier obtained by the process and adsorbed. In order to uniformly spread this granule over rice fields, a certain amount is required, and currently 3 to 4 kg of the product is spread per 10 ares. Spraying is carried out by hand or by using a granulator. Furthermore, because the granules need to be spread evenly and because the work is done in rice fields, a lot of effort is spent on dispersing the granules. [0003] Emulsion is prepared by spraying the undiluted solution before rice planting. This method is also simple, similar to the method of dispersing granules. However, spraying after rice transplantation has the disadvantage that it causes serious chemical damage to paddy rice due to the organic solvent contained in the emulsion. For this reason, emulsion spraying can only be applied before rice planting. There are also methods for spraying the emulsion, such as entering rice fields and spraying, or attaching it to a tractor or the like and dropping the undiluted solution, but these methods are laborious and costly. [0004] A method of diluting a wettable powder on an emulsion or powder with a large amount of water and dispersing the powder is 50 to 100 powder per 10 ares.
It takes a lot of effort during spraying to dilute the chemicals in about 1 liter of water. [0005] As described above, all the herbicide spraying methods conventionally applied to flooded paddy fields have various problems. [0006] The present inventors have proposed a method that has the herbicidal effect of a herbicidally active compound similar to that of a method of dispersing granules, a method of distributing an emulsion, and a method of dispersing a wettable powder in a flooded paddy field, and furthermore, The present invention was completed as a result of intensive research to develop a herbicide composition that can be sprayed more easily than the methods of spraying granules, emulsions, and wettable powders. [0007] That is, the present invention is a herbicidal composition characterized in that a foaming composition containing a carbonate and an organic acid is blended with a herbicidally active compound. [0008] The herbicidal composition of the present invention is used after being formed into tablets. By directly throwing such tablets into rice fields, the carbonate and organic acids contained in the tablets react to generate carbon dioxide gas, and due to its foaming power, the herbicidally active compound is widely diffused into the rice field water, resulting in a sufficient herbicidal effect. It is something that can be demonstrated. Furthermore, spraying is very simple, and a sufficient herbicidal effect can be expected by throwing the tablets from the paddy ridge without entering the paddy field. The method for producing the paddy herbicide composition of the present invention includes, for example, mixing and pulverizing a herbicidally active compound with a surfactant and a carrier such as a clay mineral using an air mill or a hammer mill; A method of obtaining tablets by mixing a carbonate finely ground with an air mill or hammer mill, etc. and an effervescent composition consisting of an organic acid, etc., and molding the mixture with a tablet press or molding machine, or weeding with an air mill or hammer mill, etc. The active compound, carbonate, organic acid, etc. are mixed and pulverized, and then molded using a tablet machine or molding machine to obtain tablets, or if necessary, the herbicidally active compound, carbonate, organic acid, etc. are added to stabilize the formulation. Examples include a method in which the material is coated in advance with a water-soluble polymer compound such as polyethylene glycol, or the material is mixed and molded. [0010] There are no particular restrictions on the surfactant that can be used, and those conventionally used in the field of agricultural chemical formulations can be used. [0011] Clay minerals include calcium carbonate, diatomaceous earth, talc, clay, ziecrite, bentonite,
Examples include white carbon and acid clay. The herbicidally active compounds that can be used in the present invention are not particularly limited, and specific examples include the following compounds. It goes without saying that the herbicide compounds that can be used in the compositions of the present invention are not limited to the compounds of this specific example. This compound no. are cited in the following description. Compound No. Compound name 1
1-(2-chlorobenzyl)-3-(α,α
-dimethylbenzyl)urea [Test name: JC-940] 2 O-3-te
rt-butylphenyl=6-methoxy-2-pyridyl (
methyl)thiocarbamate [generic name: pyributicarb] 3 2-(2,4
-dichloro-3-methylphenoxy)propionanilide [generic name: clomeprop] 4
4-(2,4-dichloro-3-methylbenzoyl)-1,3-dimethyl-5-(4-methylphenacyloxy)pyrazole [generic name: benzofenap] 5
4-(2,4-dichlorobenzoyl)
-1,3-dimethyl-5-pyrazolyl-p-toluenesulfonate [generic name: pyrazolate] 6 2,4-dichlorophenyl-3-methoxycarbonyl-4-nitroph
phenyl ether [generic name: bifenox] 7 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-phene
Naciloxypyrazole [generic name: pyrazoxifene] 8 1-(α,α-dimethylbenzyl)-3-(4-methylphenyl)u
Rare [generic name: Daimeron] 9
N-(α,α-dimethylbenzyl)-2-bromo-
3,3-dimethyl butyramide [
Generic name: Bromobutide] 10 2', 3'-
Dichloro-4-ethoxymethoxybenzanilide [Test name: HW-52] 11
N-[2'-(3'-methoxy)-thienylmethyl]-N-chloroacet-2,6
-Dimethylanilide [Test name: NSK-850] [
[0014] These herbicidally active compounds may be blended singly or in a mixture of two or more depending on the species of weeds to be weeded, and the mixing ratio when mixed can be selected arbitrarily. These herbicidally active compounds are contained in the herbicidal composition of the present invention in an amount of 1 to 60% by weight. Examples of the carbonate used in the herbicidal composition of the present invention include dry sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, potassium carbonate, potassium hydrogen carbonate, ammonium carbonate, and the like. The carbonate content is preferably 5 to 80% by weight, particularly 10 to 50% by weight based on the total weight of the composition. Examples of organic acids include dry citric acid, tartaric acid, malic acid, malonic acid, pyridonecarboxylic acid, succinic acid, adipic acid, fumaric acid, phosphoric acid, sodium citrate, sodium succinate, and fumaric acid. Examples include sodium, sodium phosphate, and the like. The content of the organic acid is preferably 10 to 300% by weight, particularly 30 to 150% by weight, based on the weight of the carbonate coexisting in the herbicidal composition. [0017] Further, as stabilizers for the formulation, water-soluble polymers such as polyethylene glycol, polyvinylpyrrolidone, hydroxycellulose, and polyvinyl alcohol can be mentioned. The stabilizer is added in an amount of 0.1 to 0.1 to the total amount of the composition.
It is blended in a proportion of 15% by weight. The herbicide composition of the present invention is suitable as a formulation for spraying the herbicide in flooded paddy fields after puddling and after rice transplantation, that is, after transplanting young rice seedlings. The herbicide composition of the present invention can be easily and easily sprayed by throwing tablets of the herbicide composition from the ridges of rice fields, and is superior to emulsions for spraying undiluted solution before rice planting. The fact that the herbicidal effect can be exerted to a certain extent is truly surprising. On the other hand, when spraying granules, etc., it is necessary to enter the paddy field and spread them uniformly. This requires a lot of labor, and the composition of the present invention can significantly reduce the labor. [0021] The amount of the herbicidal composition used in the present invention is not particularly limited, but it is preferably 200g to 3000g, more preferably 200g per 10 ares.
~1000g. The tablets to be dispersed are 1 g to 100 g per tablet, more preferably 10 g to 50 g per tablet.
Mold into a size of about g. The number of tablets distributed per 10 ares is preferably in the range of 5 to 500, more preferably 10 to 200. [Example] Next, Examples of formulations of the paddy herbicide composition of the present invention and comparative examples of formulations of granules and wettable powders used for comparison will be described. In Examples and Comparative Examples, "parts" indicate parts by weight. Example 1 Compound No. 1 60 copies, soft detergent 95
(Product name: Surfactant manufactured by Lion Co., Ltd.) 2 parts, Zeeklite MC (Product name: Clay mineral manufactured by Kunimine Kogyo Co., Ltd.)
The mixture was mixed and ground with 38 parts to obtain a 60% wettable powder. Next, 50 parts of this hydrating agent and 2 parts of succinic acid, which had been finely ground in advance, were added.
0 parts, 15 parts of sodium bicarbonate, 15 parts of sodium carbonate
This mixture was put into a cylindrical molded container, pressurized at a pressure of 300 kg/cm2, and made into a cylindrical molded container with a diameter of 3.5 cm and a
g tablets were obtained. Example 2 Compound No. 75 copies of 1, 95 copies of Soft Detergent
Mix and crush 2 parts of Sieglite MC with 23 parts of 7
A 5% hydrating powder was obtained. Next, 90 parts of succinic acid and 10 parts of polyethylene glycol (average molecular weight 6000) were mixed, heated to 75° C. and stirred to dissolve, cooled and pulverized to obtain a powdery pretreated product. 30 parts of this pretreated product, 25 parts of sodium hydrogen carbonate, 5 parts of sodium carbonate, and 75 parts of sodium bicarbonate.
% hydrating agent was added and prepared in the same manner as in Example 1.
．． A 5 cm, 25 g tablet was obtained. Comparative Example 1 Compound No. 1, 5 parts of Hytenol NF-13 (trade name: surfactant manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), 2 parts of Toxanone GR-30 (trade name: surfactant manufactured by Sanyo Chemical Industries, Ltd.) After mixing and pulverizing 41 parts of bentonite and 50 parts of talc, an appropriate amount of water was added and kneaded, and the mixture was granulated by a conventional method using a granulator to obtain granules. Comparative Example 2 Compound No. 1, 88 parts of Sieglite MC, and 2 parts of Soft Detergent 95 were mixed and ground to obtain a 10% hydrating powder. Examples 3 to 4 and Comparative Examples 3 to 4 After plowing and plowing the paddy fields, seeds of firefly were sown, and
．． Paddy rice seedlings (variety: Koshihikari) at the 5-leaf stage were transplanted using a rice transplanter. After rice planting, 50m2 (10×
5m). The next day, water was flooded to a depth of 3 to 5 cm. Three days after transplanting paddy rice, a prescribed amount of each drug was applied. The treatment was performed using the method described below for each drug. Herbicide Composition [Tablets] (Examples 1 and 2) One tablet prepared in Examples 1 and 2 was thrown into approximately the center of each test plot. Granules (Comparative Example 1) A predetermined amount of granules prepared according to Comparative Example 1 were uniformly spread on the surface of a field water at approximately equal intervals. Wettable powder (Comparative Example 2) A predetermined amount of the wettable powder prepared according to Comparative Example 2 was added to 2.5 liters of water (equivalent to 50 liters of sprayed amount per 10 ares).
After diluting it, it was dropped onto the entire surface of the rice field. [0031] For each chemical treatment, a water depth of 3 to 5 cm was maintained. One month after the chemical treatment, the herbicidal effect and the chemical damage to paddy rice were evaluated by observation. Herbicidal effects and paddy rice chemical damage were evaluated according to the following criteria. Table 1 shows the treatment results 3 days after transplanting paddy rice.
It was shown to. [0032] Evaluation criteria for weeding effectiveness 5: 100% control (residual weed amount: 0%)
) 4 80% control (residual weed amount 20
%) 3 60% control (residual weed amount 4
0%) 2 40% control (residual weed amount
60%) 1 20% control (residual weed amount
80%) 0 0% control (residual weed amount
100%) Judgment criteria evaluation of paddy rice chemical damage Degree of chemical damage - Harmless + - Minor damage + Small damage + + Medium damage + + + Major damage × Death 0034] [Table 1] [Table 2] [Table 2] 0036 The paddy field herbicide composition of the present invention has many excellent features and is highly practical. Example 5 Compound No. 6 84 copies, soft detergent 95
2 parts and 14 parts of Sieglite MC were mixed and crushed to give 8
A 4% hydrating powder was obtained. Next, 50 parts of this wettable powder were mixed with 20 parts of succinic acid, 15 parts of sodium bicarbonate, and 15 parts of sodium carbonate that had been finely ground in advance, and this mixture was added into a cylindrical molded container and heated at a pressure of 300 kg/cm2. It was pressed to obtain tablets with a diameter of 3.5 cm and a weight of 25 g. Example 6 Compound No. 6 84 copies, soft detergent 95
2 parts and 14 parts of Sieglite MC were mixed and crushed to give 8
A 4% hydrating powder was obtained. Next, 90 parts of succinic acid and 10 parts of polyethylene glycol (average molecular weight 6000) were mixed, heated to 75°C, stirred to dissolve, and then cooled.
It was pulverized to obtain a powdery pretreated product. 25 parts of this pretreated product, 15 parts of sodium bicarbonate, 10 parts of sodium carbonate, and 50 parts of an 84% hydrating powder were added to formulate the same as in Example 5 to obtain 25 g tablets with a diameter of 3.5 cm. Comparative Example 5 Compound No. 7 parts of 6 and 2 parts of Hitenol NF-13
After mixing and pulverizing 2 parts of toxanone GR-30, 39 parts of bentonite, and 50 parts of talc, an appropriate amount of water was added and kneaded, and the mixture was granulated using a granulator in a conventional manner to obtain granules. . Comparative Example 6 Compound No. 6, 77 parts of Sieglite MC, and 2 parts of Soft Detergent 95 were mixed and ground to obtain a 10% hydrating powder. Examples 7 to 8 and Comparative Examples 7 to 8 After plowing and puddling the paddy fields, wild field seeds were sown.
Paddy rice seedlings (variety: Koshihikari) at the leaf stage were transplanted using a rice transplanter. After rice planting, 50m2 (10 x 5m) using corrugated boards
It was divided into The next day, water was flooded to a depth of 3 to 5 cm. Five days after transplanting paddy rice, a prescribed amount of each drug was applied. The treatment was performed using the method described below for each drug. Herbicide composition [tablet] (Examples 7 and 8) One tablet prepared in Examples 5 and 6 was applied to approximately the center of the test area.
I threw in some. Granules (Comparative Example 7) A predetermined amount of granules prepared according to Comparative Example 5 were uniformly scattered on the surface of a rice field at approximately equal intervals. Wettable powder (Comparative Example 8) A predetermined amount of the wettable powder prepared according to Comparative Example 6 was added to 2.5 liters of water (equivalent to 50 liters of sprayed amount per 10 ares).
After diluting it, it was dropped onto the entire surface of the rice field. Each drug treatment is 3
The water depth was maintained at ~5 cm. One month after the chemical treatment, the herbicide effect and the chemical damage to paddy rice chemicals were evaluated by observation. Herbicidal effects and paddy rice damage were evaluated according to the above criteria. The results of the treatment 5 days after paddy rice transplantation are shown in Table 2. Effects of the Invention From the Examples and Comparative Examples, it is clear that when the paddy herbicide composition of the present invention is used, it exhibits a herbicidal effect equivalent to that of granules and wettable powders. Furthermore, compared to granules that are sprayed at 3 to 4 kg per 10 ares or wettable powders that are diluted in 50 to 100 liters of water per 10 ares and sprayed, the amount of spraying per 10 ares can be reduced. Furthermore, the method of spraying is quite simple, and the labor required for spraying is significantly reduced. It is also advantageous in terms of transportation and storage.

Claims (1)

[Claims] A rice field herbicide composition characterized in that a foaming composition containing a carbonate and an organic acid is blended with a herbicidally active compound.