JPH0648902A - Labor-saving spray type agricultural chemicals for paddy field - Google Patents

Abstract

PURPOSE:To provide agricultural chemicals capable of uniformly distributing the chemical components over the flooded paddy field utilizing paddy water in the paddy field by applying the chemicals thereinto from the levee without using a special machine or device. CONSTITUTION:This invention is an agricultural chemicals prepared by (1) making agricultural- chemical components in which the spreadability over the water surface and the dispersibility in water are controlled according to its use application absorbed on a water soluble carrier, further adding a foaming agent thereto as necessary, solidifying it using a water soluble binder and molding it into 10 to 200g granule or tablet, (2) making the chemical components adsorbed on a water soluble carrier, further adding a foaming agent as necessary and putting it into a bag made of a water soluble film or (3) covering the tablet prepared in (1) with a water soluble film, provided that bagging into a bag made of a water soluble film is included. This agricultural chemicals can readily be applied from the levee and can also be readily applied even in case the paddy field is a small-size and irregular-shape one or in case scattering of the agricultural chemicals to other adjacent fields is not desirable. Further, this agricultural chemicals can be applied from the levee even in case of rain only by taking care not to moisten the chemicals before application. Therefore, mistiming of treatment or control due to a long rain can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a labor-saving spray-type pesticide for paddy fields, which is applied from the ridge without entering the paddy field.

[0002]

2. Description of the Related Art This pesticide formulation for pitching paddy fields is used as a pesticide sprayer in paddy fields especially during the flood season due to difficulties in succeeding farmers, time constraints due to side jobs, and aging farm workers. With respect to the heavy labor of work, development is desired from the viewpoint of labor saving and light labor.

The most important problem to be solved in this direct pesticide formulation for rice field throwers is how to evenly distribute the pesticide pesticide components in the paddy field.

In order to evenly distribute the pesticide components in the input pesticide formulation in the paddy field, it is necessary to first sufficiently release the pesticide components from the formulation and then spread the released pesticide components over a wide range. .

First, in order to release the pesticide component from the preparation into water, generally, a method of utilizing the emulsification / dispersion / spreading / osmotic force of a surfactant is adopted. However, this is not enough, and for example, Japanese Patent Publication No. 47-27930, Japanese Unexamined Patent Publication No. 61-183219, and Japanese Unexamined Patent Publication No. 3-12.
As disclosed in Japanese Patent No. 8301, alkali metal or alkaline earth metal carbonates and citric acid, malic acid,
Techniques such as stirring using carbon dioxide gas foaming by reaction with a solid acid such as tartaric acid or succinic acid, or a method of lowering the specific gravity by dissolving or suspending in a water-insoluble organic solvent with a small specific gravity, and floating on the water surface Are used together.

Further, in order to spread the released pesticide components over a wide area by using paddy water, a method of utilizing the emulsification / dispersion / spreading power of a surfactant is generally used, but this alone is used. it is insufficient cause spread range from a few m ² having 10 m ² around a point. Therefore, Japanese Patent Application No. 3-32
As disclosed in Japanese Patent No. 8974, a method of imparting water repellency to spread the water surface, adding a poorly water-soluble solvent disclosed in Japanese Examined Patent Publication No. 17400/44, JP-A No. 56-71001, etc. The method of expanding the water surface is also used.

In this method, as a carrier for releasing the pesticide component from the preparation into water, a mineral substance carrier such as hydrous amorphous silicon oxide or metamorphic pearlite powder, or a water-insoluble organic carrier such as cellulose powder or cork powder. Is commonly used.

However, when the emulsifying and dispersing power of the surfactant or the specific gravity operation is performed by adding a poorly water-soluble organic solvent having a small specific gravity, the pesticide component retained in the carrier is not completely released into the water and is disintegrated in the water. It remains in a high concentration in the carrier residue that has turned into a mud, and especially in the case of a formulation of about 10 to 200 g each, the pesticide component amount on the entire surface of the paddy field is insufficient and a sufficient medicinal effect cannot be expected. The risk of chemical damage at the dropping point also increases.

When a water-soluble carrier having an oil-absorbing ability is used as a carrier for oil absorption, the carrier dissolves in water, and therefore, a pesticide component having a small specific gravity or a pesticide component dissolved or dispersed in a poorly water-soluble organic solvent having a small specific gravity is used. The surfactant is completely released into the water, and is suspended and floated to spread on the water surface.

When a water-soluble substance is used as a carrier even in a preparation which does not require oil absorption ability, the carrier dissolves in water, which causes problems of adsorption and difficult release of pesticide components to the carrier and mud on the bottom of the water. There is no problem such as incorporation into the residue of the granular carrier, and it suffices to study only the dispersion of the agricultural chemical component in water.

Pesticide formulations prepared by adsorbing a pesticide component and a surfactant on a water-soluble carrier are disclosed in JP-B-57-15802, JP-A-57-109702 and JP-A-60-.
Although disclosed in Japanese Patent No. 36402, all of these are solid emulsions obtained by solidifying a general emulsion, and when used, they are put into water in a container for adjusting a spray liquid to be stirred to form an emulsion, which is an emulsion. In this type of pesticide formulation, the provision of an emulsion having good emulsion stability is the most important issue.

[0012]

DISCLOSURE OF THE INVENTION The object of the present invention is to use ridges that do not enter the paddy field that can be used as a herbicide, an insecticide having a penetrative transferability into the plant, a fungicide, etc. among the pesticides applied in the flooding season. The purpose is to provide labor-saving spray type pesticides for paddy fields that are applied from the shore.

[0013]

[Means for Solving the Problems] The formulation of the present invention has a dosage form in which a water-soluble carrier is made to absorb an agrochemical component whose water surface spreadability and dispersibility in water are adjusted depending on the application, and further, if necessary. A foaming agent, solidify with a water-soluble binder and mold into 10 to 200 g of granules or tablets,
A method in which a water-soluble carrier is made to absorb oil, a foaming agent is added if necessary, and a bag of a water-soluble film is filled, and a tablet formed by is coated with a water-soluble film, including bag filling, is applied. The shape to be modeled is shown.

That is, in the present invention, the pesticide component is solidified with a water-soluble binder together with a water-soluble carrier to obtain 10 to 20.
It is a solidifying agent of 0 g.

When solidifying the agrochemical component with a water-soluble binder, the agrochemical component is dissolved or dispersed in a poorly water-soluble organic solvent in advance, or the agrochemical component itself is mixed with a surfactant if necessary. Therefore, it is necessary to adsorb it on a water-soluble carrier or to prepare a mixed state.

The surfactant as the water dispersibility-imparting agent of the present invention is obtained by emulsifying a poorly water-soluble organic solvent solution of an agricultural chemical component in water.
Less than HLB required for solubilization, or less than the amount required for stable emulsification, that is, 5 parts of a mixture of a poorly water-soluble organic solvent solution of an agricultural chemical ingredient and a surfactant is added to 95 parts of water and gently mixed. It is necessary to use an HLB surfactant or an amount to be used so that the emulsion is broken and separation occurs within 5 minutes.

When adsorbing on a water-soluble carrier or mixing, a carbonate of an alkali metal or alkaline earth metal and citric acid. A mixture with a solid acid such as malic acid, tartaric acid or succinic acid can be solidified with a water-soluble binder and added.

Further, it is solidified with a binder to 10 to 2
It is also possible to package a solidifying agent of 00 g with a water-soluble film to form a pack.

As the water-soluble carrier, when the pesticide ingredient is dissolved or dispersed in a poorly water-soluble organic solvent, or when the pesticide ingredient which is liquid at room temperature is used for the formulation, the water-soluble carrier itself is
Even if it absorbs 0% by weight or more of a poorly water-soluble organic solvent, it is physically stable and does not cause a phenomenon such as liquid exudation during normal handling. However, oil absorption stability is not required, but in any case, it easily dissolves in cold water such as paddy field water in a short time.Glucose and lactose, starch hydrolyzate, water-soluble cellulose derivative, water-soluble protein, water-soluble A synthetic polymer substance or the like or a mixture thereof can be used.

[0020]

The present invention is a pesticide formulation that is directly applied to paddy fields, and the quality and amount of the surfactant is preferably such that the pesticide component or the pesticide component solution is soaked in water to promote suspension and dispersion. The quality and amount of the surfactant that gives an emulsion with good stability rather delays its spread over a wide area, which is a problem in terms of drug efficacy.

Since the drug of the present invention is applied from a ridge, its dosage form is not limited to a sprayer or the like, and about 10 g to 200 g is suitable from the viewpoint of throwing work and the number of charges to the field. However, it is decided in consideration of the dosage form, taking into consideration the influence of wind at the time of introduction, the arrival distance of introduction, the risk of being buried in mud, and the like.

In practicing the present invention, it is an important point to appropriately impart water surface spreadability and water dispersibility in order to uniformly spread pesticide components in the paddy field. If the water surface spreadability is insufficient, the pesticide components in the paddy field are unevenly distributed, which causes phytotoxicity due to local high concentration and causes poor effect due to the pesticide components not being spread. If the dispersibility in water is insufficient due to the water surface spreadability alone, the pesticide components will float on the water surface for a long time and the dispersion in the water will be delayed, and the pesticide components will be biased due to being blown by the wind, again causing chemical damage and poor efficacy. Becomes

The present invention provides the water surface spreading property as follows.
In the case of a large pesticide component, low viscosity, a small water-insoluble organic solvent having a small specific gravity, for example, mineral oil, synthetic solvent, a method of lowering the specific gravity by dissolving or suspending in animal and vegetable fats and oils,
The addition of a surfactant, which is a general method, was used to impart dispersibility in water. However, if the selection of a surfactant for imparting dispersibility in water is not proper, it will rather reduce the water surface spread, and it is necessary to select it in relation to the characteristics of the pesticide component used, the water surface spreadability-imparting solvent, etc. is there.

[0024]

【Example】

Example 1 S-Ethyl-hexahydro-1H-azepine-1-carbothioate 24 g Naphthene hydrocarbon solvent 12 g Polyoxyethylene (EO 10 mol) Nonylphenyl ether 2 g or more are mixed and dissolved to give an oil-absorbing dextrin (trade name). : Paindex Y) 62 g was evenly absorbed and dispersed, and this was filled in a bag made of a polyvinyl alcohol film.

Example 2 2-Methylthio-4,6-bis (ethylamino) -s-triazine 10 g Hydrocarbon solvent for dry cleaning 10 g Polyoxyethylene (EO 7 mol) Nonylphenyl ether 3 g Citric acid 10 g Sodium carbonate 10 g Polyethylene glycol (trade name: PEG 6000) 7 g Oil-absorbing dextrin (trade name: Oil Q) 50 g After mixing the above, the mixture is press-molded and stored in a moisture-proof bag by a person.

Example 3 S-Ethyl-hexahydro-1H-azepine-1-carbthioate 24 g 2-Methylthio-4,6-bis (ethylamino) -s-triazine 5 g Fume kerosene 15 g Polyoxyethylene (EO9.5) 2 g or more of (mol) nonylphenyl ether were mixed and dissolved, and uniformly dispersed in 54 g of oil-absorbing dextrin (trade name: Oil Q). This was filled in a bag made of polyvinyl alcohol film.

Example 4 S-Ethyl-hexahydro-1H-azepine-1-carbothioate 24 g 2-methylthio-4.6-bis (ethylamino) -s-triazine 5 g n-octyl alcohol 15 g polyoxyethylene ( EO 16 moles) styryl phenyl ether, polyoxyethylene (EO 19 moles) styrylphenyl ether-formaldehyde condensation polymer, calcium dodecyl benzene sulfonate, xylene blended product 2 g or more are mixed and dissolved, and oil-absorbing dextrin (trade name) : Pa index Y) Dispersed evenly in 54 g. This was filled in a bag made of polyvinyl alcohol film.

Example 5 (2-Isopropyl-4-methylpyrimidyl-6-)-diethylthiophosphate 10 g Fog kerosene 10 g Polyoxyethylene (EO 12 mol) Nonylphenyl ether 2 g The above ingredients were mixed and dissolved to give sodium hydrogencarbonate 5 g. Polyethylene glycol (trade name: PEG 6000) 7 g Oil-absorbing dextrin (trade name; oil Q) 66 g was evenly liquid-dispersed and pressed into tablets.

Example 6 (2-Isopropyl-4-methylpyrimidyl-6-)-diethyl thiophosphate 10 g Naphthene hydrocarbon solvent 10 g Polyoxyethylene (EO 16 mol) Styryl phenyl ether, polyoxyethylene (EO 19 mol) ) Styrylphenyl ether-formaldehyde condensation polymer, calcium dodecylbenzene sulfonate, xylene blended product 1g or more are mixed and dissolved, and sodium hydrogencarbonate 5g and oil-absorbing dextrin (product name: Paindex Y) 74g are uniformly dispersed by liquid absorption. Let This was filled in a bag made of polyvinyl alcohol film.

Example 7 (2-Isopropyl-4-methylpyrimidyl-6-)-diethylthiophosphate 10 g 2-Isopropylphenyl-N-methylcarbamate 12 g Naphthene hydrocarbon solvent 10 g Polyoxyethylene (EO 12 mol) Nonyl 2 g or more of phenyl ether were mixed and dissolved, and sodium hydrogencarbonate 5 g, oil-absorbing dextrin (trade name: oil Q) 25 g, and anhydrous sodium sulfate 36 g were uniformly liquid-dispersed. This was filled in a bag made of polyvinyl alcohol film.

The following preparations were made for comparison.

Comparative Example 1 S-Ethyl-hexahydro-1H-azepine-1-carbothioate 24 g Naphthene-based hydrocarbon solvent 12 g Polyoxyethylene (EO 16 mol) Nonylphenyl ether 4 g The above ingredients were mixed and dissolved to give modified pearlite powder. The solution was uniformly dispersed and dispersed in 60 g and filled in a bag made of a polyvinyl alcohol film.

Comparative Example 2 S-Ethyl-hexahydro-1H-azepine-1-carbothioate 24 g Polyoxyethylene (EO 16 mol) styryl phenyl ether, Polyoxyethylene (EO 19 mol) Styryl phenyl ether-formaldehyde Polycondensation product, calcium dodecylbenzene sulfonate, xylene 6 g or more were mixed and dissolved to uniformly absorb and disperse 70 g of modified pearlite powder, and this was filled in a bag made of a polyvinyl alcohol film.

Comparative Example 3 2-Methylthio-4,6-bis (ethylamino) -s-triazine 10 g Hydrocarbon solvent for dry cleaning 10 g Polyoxyethylene (EO 7 mol) Nonylphenyl ether 3 g The above was mixed and dissolved to contain water. Amorphous silicon oxide (20 g) was uniformly liquid-dispersed in 30 g of modified pearlite powder.

Furthermore, polyethylene glycol (trade name; PEG 6000) 7 g Malic acid 10 g Sodium carbonate 10 g were mixed, pressure-molded, and stored in a moisture-proof bag.

Comparative Example 4 S-Ethyl-hexahydro-1H-azepine-1-carbothioate 24 g 2-methylthio-4,6-bis (ethylamino) -s-triazine 5 g n-octyl alcohol 15 g polyoxy Ethylene (EO 16 mol) styryl phenyl ether, polyoxyethylene (EO 19 mol) styryl phenyl ether-formaldehyde condensation polymer, calcium dodecylbenzene sulfonate, xylene blended product 5 g or more are mixed and dissolved to give water-containing amorphous silicon oxide. 21 g Metamorphic pearlite powder 30 g were uniformly liquid-dispersed. This was filled in a bag made of polyvinyl alcohol film.

Comparative Example 5 (2-Isopropyl-4-methylpyrimidyl-6-)-diethylthiophosphate 10 g Fog kerosene 10 g Polyoxyethylene (EO 16 mol) styryl phenyl ether, polyoxyethylene (EO 19 mol) styrylphenyl Ether-formaldehyde condensation polymer, calcium dodecylbenzene sulfonate, xylene blended product 5 g or more are mixed and dissolved, sodium hydrogencarbonate 5 g Polyethylene glycol (trade name; PEG 6000) 7 g Water-containing amorphous silicon oxide 30 g Metamorphic pearlite The powder was uniformly liquid-dispersed and dispersed in 33 g of the powder, and the mixture was pressed into tablets.

Comparative Example 6 (2-Isopropyl-4-methylpyrimidyl-6-)-diethylthiophosphate 10 g Polyoxyethylene (12 mol EO) Nonylphenyl ether 5 g The above ingredients were mixed and dissolved and sodium hydrogencarbonate 5 g Metamorphic pearlite powder 35 g of anhydrous sodium sulfate was uniformly absorbed and dispersed in 45 g of anhydrous sodium sulfate. This was filled in a bag made of polyvinyl alcohol film.

Comparative Example 7 (2-Isopropyl-4-methylpyrimidyl-6-)-diethylthiophosphonate 10 g 2-Isopropylphenyl-N-methylcarbamate 12 g n-octyl alcohol 10 g Polyoxyethylene (EO 16 mol) Styryl phenyl ether, polyoxyethylene (EO 19 mol) Styryl phenyl ether-formaldehyde condensation polymer, calcium dodecylbenzene sulfonate, xylene blended product 5 g or more mixed and dissolved Sodium hydrogen carbonate 5 g Metamorphic pearlite powder 40 g Anhydrous sodium sulfate 18 g The solution was uniformly absorbed and dispersed. This was filled in a bag made of polyvinyl alcohol film.

Comparative Example 8 Commercially available Audulma granules were used.

(S-Ethyl-hexahydro-1H-azepine-1-carbothioate 8%) Comparative Example 9 A general herbicidal granule formulation containing inorganic fine powder, a surfactant, a binder and the like as simethrin granules. Therefore, a granule having a diameter of about 1 mm was used.

(2-Methylthio-4,6-bis (ethylamino) -s-triazine 2.5%) Comparative Example 10 Commercially available Mammet granules were used.

(S-ethyl-hexahydro-1H-azepine-1-carbothioate 6%) (2-methylthio-4,6-bis (ethylamino) -s
-Triazine 1.5%) Comparative Example 11 A commercially available diazinon 3% granule was used.

[(2-Isopropyl-4-methylpyrimidyl-6-)-diethyl-thiophosphate 3%
Comparative Example 12 Commercially available mipudinone granule 7 was used.

[(2-isopropyl-4-methylpyrimidyl-6-)-diethyl-thiophosphate 3%
(2-Isopropylphenyl-N-methylcarbamate 4%) Each of the agents of Examples 1 to 4 and Comparative Examples 1 to 4 and 8 to 10 was subjected to a herbicide test.

The paddy field on the diluvial volcanic ash plantation was scavenged for 3 days.
Rice seedlings (variety: Hinohikari) at the 3-leaf stage after day were transplanted.
(Reduced water depth 1 cm / day) On the next day, as shown in FIG.

In Example 1 and Comparative Examples 1, 2, and 7, 7 days after transplantation, in Examples 2, 3, 4 and Comparative Examples 3, 4, 8 and 9, 14 days after transplantation, the submerged depth was 5 to 7 cm. Example 2 and Comparative Example 3 were taken out from the moisture-proof bag, and Examples 1, 3 and 4 and Comparative Examples 1, 2 and 4 were 100 g each in the central portion of each section as a bag made of a polyvinyl alcohol film.
In addition, 300 g of the general granules of Comparative Examples 7, 8 and 9 were uniformly sprayed by hand. Water was stopped for 3 days after all treatments.

Four hours after the treatment, paddy water was collected from the four corners and the central part of each ward, and when residues were found at the input points, the residues were collected and analyzed for each pesticide component. The values are shown in Table 2. During the paddy field diffusion test, a wind of 4 to 7 m / sec was intermittently blown from the lower right to the upper left of FIGS.

At the second and fourth weeks after the treatment, the herbicidal effect and the phytotoxicity against rice were observantly evaluated according to the criteria shown in Table 1, and the results shown in Tables 3 to 5 were obtained.

[0050]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5] From this table, it can be said that the agents of Examples are comparable to the agents applied in conventional flooded paddy fields in terms of both effective and harmful effects.

Next, Examples 5-7 and Comparative Examples 5-7, 11,
Each of the 12 drugs was subjected to an insecticide test.

The paddy field of diluvial volcanic ash plantation soil was scavenged for 3 days.
Rice seedlings (variety: Hinohikari) at the 3-leaf stage after day were transplanted.
(Reduced water depth 1 cm / day) On the next day, as shown in FIG. Fourteen days after the transplantation, the inundation depth was set to 3 to 5 cm, and in Examples 5, 6 and 7 and Comparative Examples 5, 6 and 7, 10 were placed in the center of each section.
1 g of 0 g was added, and the general granules of Comparative Examples 11 and 12 were 4
00 g was evenly applied by hand. Water was stopped for 3 days after all treatments.

On the 7th and 14th days after the treatment, as shown in FIG.
The numbers of surviving worms were investigated for any 20 strains in each of the plots A to E5 by the stripping method using an adhesive plate, and the results shown in Tables 6 and 7 were obtained.

[0054]

[Table 6]

[Table 7] From the same table, it can be said that the agents of the Examples exhibit effects comparable to those of the agents sprayed in the conventional flooded paddy field.

[0055]

EFFECTS OF THE INVENTION The purpose of the present invention is to use the surface water of a flooded paddy field to throw the pesticide components evenly into the paddy field by directly introducing it from the ridge without using special machinery. The present invention relates to an agricultural chemical, characterized by shaping a pesticide component that imparts water surface spreadability and dispersibility to a pesticide component with a water-soluble carrier into a shape that can be introduced from a ridge. .

The present invention not only makes it easy for elderly people to apply pesticides, but even for a part-time farmer, the pesticides can be easily applied in the early morning before work or in the evening after returning home by walking around the ridge. It can be applied and applied. Further, it is possible to easily treat even small-sized paddy fields with irregular shapes and pesticides that have a problem of scattering to other adjacent cultivated fields. Further, if care is taken to prevent the chemicals from getting wet before the introduction, the application can be performed even in rainy weather, and there is no possibility that the treatment period is delayed or the control is delayed due to long rain.

[Brief description of drawings]

FIG. 1 shows a diagram of test plots when the paddy field pesticide of the present invention is subjected to a herbicide test.

FIG. 2 shows the surveyed sites in each section of the herbicide test.

FIG. 3 shows a plot of an insecticide test site.

FIG. 4 shows the surveyed sites in each section of the insecticide test.

Claims (8)

[Claims] 1. A pesticide formulation for direct rice field throwers, which comprises solidifying the pesticide component itself with a water-soluble carrier with a water-soluble binder to give a solidifying agent of 10 to 200 g. 2. A pesticide formulation for direct paddy field input, which comprises mixing a pesticide component itself with a surfactant and solidifying the mixture with a water-soluble carrier with a water-soluble binder to give a solidifying agent of 10 to 200 g. 3. A pesticide formulation for direct rice field throwers, which is obtained by solidifying an agrochemical component contained in a poorly water-soluble organic solvent with a water-soluble carrier with a water-soluble binder to form 10 to 200 g of a solidifying agent. 4. The method according to any one of claims 1 to 3, wherein the pesticide component-containing mixture is solidified with a water-soluble binder by adding an alkali metal or alkaline earth metal carbonate and citric acid. A pesticide formulation for direct paddy field injection, which is solidified with a mixture of a solid acid such as malic acid, tartaric acid or succinic acid to form a solidifying agent of 10 to 200 g. 5. The method according to any one of claims 1 to 3, wherein 1
A pesticide formulation for direct paddy field throwers, in which 0 to 200 g of a solidifying agent is wrapped in a water-soluble film to form a pack. 6. The method according to any one of claims 1 to 3, wherein the water-soluble carrier easily dissolves in cold water such as paddy field surface water in a short time, for example, glucose which is a water-soluble organic substance,
Lactose, starch hydrolyzate, water-soluble cellulose derivative, urea, water-soluble protein, water-soluble synthetic polymeric substance, etc., and any of water-soluble inorganic salts such as sodium sulfate, sodium chloride, potassium chloride, ammonium sulfate, or the like, or A pesticide formulation for direct paddy field that is a mixture. 7. The mixture according to claim 2, wherein the surfactant is a solution of the pesticide component or a mixture of HLB or less required for emulsification / solubilization of the pesticide component itself in water or less than an amount required for stable emulsification. Pesticide formulation for direct paddy field. 8. The emulsifying agent according to claim 7, wherein the amount of the surfactant mixed is such that the solution of the agrochemical component or the mixture of the agrochemical component itself and the surfactant is gently stirred and mixed, and then allowed to stand still within 5 minutes. Agricultural chemicals for direct paddy field use, in which damage occurs and separation occurs.