JPH11199416A - Granular soil treatment agent for controlling organism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain in high efficiency the subject soil treatment agent with high commodity value as an agrochemical by including a specific azide compound in high concentrations, an extender, and a specific binder. SOLUTION: This soil treatment agent is obtained by including (A) 10-70 wt.% of an azide compound capable of producing hydrogen azide when decomposed, (B) 30-90 wt.% of an extender, and (C) 1-25 pts.wt. based on 100 pts.wt. of the components A+B, of a binder 200-1,200 ml/100 g in water absorption in the weight ratio C/A of 0.1-1.0; wherein the component A is pref. a compound hydrolyzable when subjected to moisture action, specifically being sodium azide or the like; the component B is pref. talc, pyrophyllite-based agalmatolite clay, Zeeklite, calcium carbonate or the like; and the component C is pref. pregelatinized modified starch, a carboxymethylcellulose alkali salt or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granular soil treatment agent for biological control comprising a bulking agent, an azide compound capable of generating hydrogen azide by decomposition, and a binder having a specific water absorption. More specifically, a biocontrol soil treatment agent that ensures safety during work, can perform spraying on the soil homogeneously and effectively, and also efficiently exhibits the effect as a pesticide,
The present invention relates to a granular soil treatment agent for biological control having excellent production efficiency and high commercial value as an agricultural chemical.

[0002]

2. Description of the Related Art In recent years, there has been a demand for an effective soil treatment agent for controlling weeds that significantly impair the growth of pests and crops in soil. Known DD agent (active ingredient, 1,3-dichloropropene), phosthiazate agent (active ingredient, butyl-O-ethyl-2-oxo-1,3)
-Thiazolidine-3-ylphosphonothioato) is effective against nematodes living in soil, but is not effective in controlling soil pathogens and weeds. Dazomet (active ingredient 3,5)
-Dimethyltetrahydro-2H-1,3,5-thiadiazin-2-thione) is effective against nematodes and pathogens, but does not show sufficient effect for controlling weeds. It has the disadvantage that the degree of efficacy and the phytotoxicity to crops vary depending on the height.

On the other hand, an azide compound which can generate hydrogen azide by decomposition, for example, azide salts, is easily hydrolyzed in soil when administered to a field to produce gaseous hydrogen azide. It has been known that such gaseous hydrogen azide has excellent effect on controlling pests and weeds in soil. Based on this fact, soil treatment using such azide compounds is regarded as an effective means for controlling a wide range of pests and weeds in soil (Can. J. Micr).
obiol. 565-570 (1974)).

[0004] In general, these soil treating agents are formulated not only to obtain effective and stabilized control results, but also to obtain simpler and safer working effects.
In devising these formulations, the most appropriate physicochemical properties of the active ingredient are fully utilized to determine the optimal agricultural chemical type. For example, since the DD agent is easily soluble in an organic solvent, its dosage form is prepared as an oil, and such an oil can be uniformly diffused by injecting deep into the soil with the aid of a dispenser. The active ingredient of the dazomet preparation is a solid preparation because it is solid at room temperature, and is prepared as finely divided granules to further ensure uniform application to the field. As shown by these, as the dosage form of the soil treatment agent, a preparation form that maximizes the physicochemical properties of the active ingredient is selected.

Azide compounds which can generate hydrogen azide by decomposition, for example, azide salts, also make use of the physicochemical properties that the azide salts have high water solubility.
In some cases, the composition may be prepared as a solution of a high-concentration aqueous solution and administered as it is. However, granules are generally desired for the operation of administering the soil treating agent. Granules are advantageous because they do not cause powdering or scattering of the active ingredient in the administration operation, are easy to handle and measure, and are easy to store and store for a long period of time. Therefore, there is known a granulation technique in which a concentrated aqueous solution of an azide salt is once prepared and then absorbed or adsorbed by an absorption-type or adsorption-type granular extender to obtain a granule. However, this production technique has a problem that the azide salt is limited to a low concentration region, and is not sufficiently practical.

[0006] The applicant of the present application has sought to solve such a problem.
A biocontrol composition comprising a bulking agent, an azide compound capable of generating hydrogen azide by decomposition, and a water-soluble binder has already been proposed (JP-A-8-295610). However, such compositions can contain such azide compounds at high concentrations, but when producing granules, such water-soluble compounds must be dissolved in water once and then added to a mixture of such bulking agents and the like. It is difficult to manufacture granules, and the granules are easily adhered to each other, so that agglomerates are likely to be generated and it is necessary to loosen the agglomerates in advance in the next sizing step, and there are parts where production efficiency is poor. there were. Furthermore, the granules obtained after the sizing step include those having a deformed shape, and granules having a more uniform shape and high commercial value have been demanded. That is, although it is desired to efficiently obtain granules having higher commercial value, the conventional methods have not been sufficient.

In general, a granule as a molded product by extrusion granulation, particularly wet granulation, is prepared by mixing a wet powder obtained by previously mixing various components as raw materials of the granule and, if necessary, further water with a solid phase in the wet powder. The ratio of the liquid phase and the gas phase is adjusted so as to be in a region suitable for molding, and then molded. Such a ratio is the key to the feasibility of molding conditions, and by stably maintaining a ratio suitable for molding, such extruded granulation is stably maintained,
It is possible to obtain the desired granules in good yield.

However, such a water-soluble powder raw material causes a water dissolution phenomenon due to the influence of the manufacturing environment such as frictional heat during molding and a rise in the temperature of the granules. Will not be. As a result, molding defects or reattachment of the granules themselves occur, making it difficult to obtain the desired granules, resulting in poor product yield.

Since powdery materials having high water solubility are easily dissolved in a small amount of kneading water as the powder becomes finer, it is difficult to determine an appropriate amount of water for molding, and it is difficult to determine standard molding conditions. It becomes difficult. These phenomena affected by solubility are generally known as "thermal softening phenomena" during granulation. To avoid this effect, various measures must be taken not only for the composition of the composition and its mixing ratio, but also for temperature control and manufacturing conditions. Although it was broken, it was not satisfactory enough.

That is, when an azide compound capable of generating hydrogen azide by decomposition, particularly a highly water-soluble azide salt, is granulated by a wet extrusion granulation technique, which is a conventional granulation technique for conventional agricultural chemicals. However, a stable production technique for preventing the thermal softening phenomenon at the time of molding caused by the high water solubility characteristic of such azide compounds has not been established, and a solution to such a problem has been demanded.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a granular soil for biological control which contains a high concentration of an azide compound which can generate hydrogen azide by decomposition, particularly azide salts, and which can be stably produced. It is to provide a processing agent. More specifically, when granulating a composition for biological control using extrusion granulation technology, the present invention provides a granular soil treatment agent for biological control that can be stably manufactured without being affected by the water content. The advantage of the present invention is to provide the advantages of the formulation.

The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a composition comprising a bulking agent, an azide compound capable of generating hydrogen azide by decomposition, and a binder having a water absorption in a specific range. Contains azide compound at high concentration, and is excellent in production efficiency, and found to be suitable for producing a granular soil treatment agent for biological control having high commercial value as an agricultural chemical, and for the biological control of the present invention. The granular soil treatment agent was completed.

[0013]

That is, according to the present invention, a granular soil treating agent for biological control comprising a bulking agent, an azide compound capable of generating hydrogen azide by decomposition and a binder having a specified amount of water absorption. Is provided.

As the azide compound capable of generating hydrogen azide used as the component A in the present invention, a compound which hydrolyzes under the action of moisture is desirable, for example, an azide salt, particularly an alkali metal salt or an alkaline earth salt. Metal salts are preferred, and specific examples include sodium azide, calcium azide, barium azide, and the like, with sodium azide being particularly preferred.

The extender used as the component B in the present invention includes, among extenders generally used for agricultural preparations, fine powders of mineral substances which are inert to the azide compound according to the component A of the present invention. Body. Examples of such extenders include talc, sericite, silica stone, silica sand, pyrophyllite-based pyroxene clay, ziglite, zeolite, calcium carbonate, diatomaceous earth, slaked lime, and the like. In addition, the particle size of such an extender is preferably 5 to 50.
μm particles can be preferably used because the desired homogeneous granules can be more easily produced.

Preferred extenders include talc, pyrophyllite-based limestone clay, ziglite, calcium carbonate, and slaked lime. If necessary, an appropriate amount of a water-soluble alkaline substance can be added. Examples of the water-soluble alkaline substance include alkali metal salts and alkaline earth metal salts. Further, the component B of the present invention can be used not only alone, but also as a mixture of two or more as necessary.

The binder used as the component C in the present invention has a water absorption of 200 to 1200 ml / 100 g.
Is a compound.

The water absorption in the present invention is defined by JIS K-
The measurement is performed in accordance with the measurement conditions of the “method for measuring oil absorption” specified in 5101. That is, distilled water is dropped from the burette to the sample on the glass plate by one to several drops at a time, and each time the mixture is sufficiently kneaded with a metal spatula, and the operation of dropping and kneading is repeated to determine the amount of water at which the entire sample softens and starts to fluidize. , Calculated as the amount of water per 100 g of the sample. In other words, when the metal spatula is wound up into a spiral shape, when it is not wound up into a spiral shape, the water content immediately before it sticks to the glass plate is calculated by suddenly softening with one drop of distilled water. It is.

By having such a range of water absorption,
The binder used in the present invention absorbs moisture when kneading to an appropriate degree. This makes it possible to suppress the dissolution of the azide compound as the component A of the present invention in water, and particularly to stably maintain the proportions of the solid phase, the liquid phase and the gas phase during wet extrusion granulation to the proportions suitable for molding. It has become possible. If the water absorption is less than 200 ml / 100 g, the water absorption is insufficient,
Water dissolution of the azide compound could not be suppressed, 1200 ml / 1
If it exceeds 00 g, the plasticity at the time of extrusion granulation becomes insufficient and granulation becomes difficult, which is not preferable.

By the action of the above-mentioned binder, it is preferable that such a binder has the above-described water absorption to kneading water, has low solubility, and has a high viscosity.

From this viewpoint and from the viewpoint of use as a soil treatment agent, preferred binders as the C component of the present invention include pregelatinized modified starch, dextrin, gum arabic, carboxymethylcellulose, which satisfies such a water absorption range. Examples include methylcellulose, hydroxypropylcellulose, polyvinyl alcohol, partially saponified vinyl acetate, polyvinylpyrrolidone, and alkali salts of carboxymethylcellulose. These may be used alone, or two or more components may be mixed and used in accordance with the physicochemical properties such as a target particle size range, water surface sedimentation or floating, and disintegration or non-disintegration in water.

Further, from the viewpoint of the interaction with the azide compound which is the component A of the present invention, the water absorption is 200 to 1200 ml.
Particularly preferred are pregelatinized starch and alkali salts of carboxymethylcellulose, for example sodium carboxymethylcellulose, which is / 100 g.

In the present invention, the mixing ratio of the azide compound capable of generating hydrogen azide (component A), the extender (component B) and the binder having a specific water absorption (component C) is as follows.
Component C is added in an amount of 1 to 70% by weight of component A and 30 to 90% by weight of component B, and 100 parts by weight of component A and component B in total.
It is preferable that the weight ratio of the C component to the A component is 0.1 to 1.0 part by weight. More preferably, the C component is 2 to 20 parts by weight, and the weight ratio of the C component to the A component is 0.1 to 100 parts by weight, which is 15 to 60% by weight of the A component and 40 to 85% by weight of the B component. 1 to
1.0, particularly preferably the C component is 3 to 15 parts by weight, and the weight ratio of the A component to the C component is 0.15 to 0.1.
It is in the range of 40.

If the amount of the component A is less than 10% by weight in the total of 100 parts by weight of the components A and B, the efficacy is not sufficient.
Exceeding the weight percentage makes it extremely difficult to produce granules, which is not preferred. On the other hand, if the amount of the component C is less than 1 part by weight, the amount of the binder is insufficient. If the amount exceeds 25 parts by weight, the plasticity of the composition becomes insufficient and extrusion granulation becomes difficult, which is not preferable. Further, when the weight ratio of the component C to the component A is less than 0.1, the dissolution of the component A in water cannot be sufficiently suppressed, so that the molding of the granules becomes difficult. The plasticity of the product is insufficient, and extrusion granulation becomes difficult, which is not preferable.

The granular soil treating agent for biocontrol of the present invention includes A
In addition to the components, B component and C component, various substances are added as needed within a range that does not impair the purpose of the present invention, that is, within a range that does not greatly affect the preparation process and granule quality of the present invention. can do. For example, when spraying a soil treating agent, a dye or pigment component can be added to color the granular soil treating agent of the present invention by adding a dye or pigment component for the purpose of easily identifying and confirming the uniformity of the applied state of the soil surface layer. . In addition to the method of adding the colorant simultaneously with the A component, the B component, and the C component, and then kneading water such as distilled water,
If it is a water-soluble dye, its necessary amount may be dissolved in kneading water in advance, and the coloring kneading water may be added.

Further, for the purpose of controlling the release of an azide compound as an active ingredient from the granular soil treating agent for biological control of the present invention, it is possible to add a further auxiliary agent to the soil treating agent. In other words, the azide compound, which is an active ingredient, comes into contact with moisture contained in soil, and the dissolution and gasification reactions proceed. Therefore, sodium lauryl sulfate or the like is used for the purpose of promoting or homogenizing the contact with such moisture. May be added, or a nonionic surfactant such as polyoxyethylene nonylphenyl ether may be added. Conversely, if it is desired to delay gasification due to workability problems, etc., use a metal soap such as calcium stearate or a water repellent such as silicone oil as necessary for the purpose of eliminating or eliminating contact with moisture. Alternatively, an appropriate amount may be added.

In order to reinforce the effect of the disinfectant for soil treatment, known active ingredients for agricultural chemicals can be added to the granular soil treatment agent for biological control of the present invention, if necessary. . For example, in order to enhance and expand the nematicidal effect in soil, in addition to the azide compound, phosthiazate (butyl-O-ethyl-2-yl) having a high nematicidal effect is added.
Oxo-1,3-thiazolidin-3-ylphosphonothioato) can also be added to the granular soil treating agent of the present invention. Similarly, in addition to an azide compound, micronized TPN (tetrachloroisophthalonitrile) having a high general bactericidal effect can be added to the granular soil treating agent of the present invention in addition to the azide compound for the purpose of reinforcing and expanding the soil bactericidal effect. . Similarly, in order to enhance and expand the weed herbicidal effect of weeds, in addition to azide compounds, DCMU (3-
(3,4-dichlorophenyl) -1,1 dimethyl urea)
Can be added to the soil treating agent of the present invention to form granules.

The method for producing the granular soil treating agent for biological control according to the present invention includes, for example, kneading a mixture of the component A, component B, and component C of the present invention with additional water, followed by extrusion molding. Alternatively, a method of compressing and granulating, drying this and removing moisture can be used. As a granulation method, a wet extrusion granulation method is particularly preferred as a simple and efficient granulation method, and the composition of the present invention is particularly suitable for such a granulation method.

More specifically, by selecting an extrusion die or screen having a pore size suitable for the size of the kneaded composition, granules having a particle size excellent in handleability can be easily prepared. Can be made. Screw type (also called horizontal type or pre-press type) for extrusion granulation
Alternatively, there are various types such as a cylindrical type (also referred to as a vertical type). In any of the types, the composition of the present invention is suitable, and a target granule can be obtained efficiently.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to examples. Parts in Examples are parts by weight, and% indicates% by weight. The method for measuring the water absorption and the method for evaluating the granulation yield are shown below.

1. Method of measuring water absorption "Method of measuring oil absorption" specified in JIS K-5101
The measurement was performed in the following manner according to the measurement conditions described in above. 23
In an atmosphere of 50 ° C. and a relative humidity of 50%, 10 g of a sample powder of the binder as the component C of the present invention was placed in a 200 ml glass beaker, and 0.5 ml of distilled water was added thereto using a burette.
Gently add the solution gently at a rate of 1 l. Each time it is dropped, it is thoroughly kneaded with a metal spatula to achieve homogenization with the sample powder. The operation of dropping and kneading is repeated to obtain the amount of water (Aml) at which the whole sample starts to soften and fluidize, that is, the amount of water when the metal spatula is formed into a spiral shape, and is calculated by the following equation. However, the start of fluidization is determined in a state one minute after the end of water injection. Water absorption (ml / 100g) = A x 10

2. Evaluation method of granulated product yield Granulated products obtained in the following Examples and Comparative Examples, that is, those obtained by drying granules after extrusion granulation as they are, were subjected to 48 mesh (300 μm) and 9 mesh (2000 μm) meshes. And the ratio of the 48 to 9 mesh granular material in all the particles was calculated and expressed as the yield of granulated product. As this value is higher, a granulated product closer to the product is obtained, so that the granulated product can be subjected to a sizing process as it is and a product having a uniform shape can be obtained.

3. Product Yield Evaluation Method The product obtained in the following Examples and Comparative Examples, that is, the granulated product after extrusion granulation, after sieving through a sizing step, dried such granules were 48 mesh (300 μm) and 16 mesh (1000 μm), and calculate the ratio of the granular material of 48 to 16 mesh in all the particles,
Expressed as product yield. Such a particle size range is a particle size range of granules based on the Agricultural Chemicals Control Law, that is, 48 mesh to 10 mesh.
It falls within the range of mesh (300 μm to 1700 μm). That is, the higher the product yield, the higher the production efficiency.

[Example 1] 750 parts of sodium azide powder (manufactured by Toyo Kasei Co., Ltd.) having a mesh size of 80 mesh or less was added to 1971 parts of clay (manufactured by Katsumitsu Mine Co., Ltd., A clay) and mixed well. . Furthermore, 90 parts of calcium stearate (manufactured by Wako Pure Chemical Industries, Ltd.) and 150 parts of pregelatinized modified starch (manufactured by Nichien Chemical Co., Ltd., AMICOL C), 30 parts of white carbon (manufactured by Nippon Silica Co., Ltd., Nipsil NS) Was added and mixed, and the mixture was placed in a kneader (Model DHJ-10, manufactured by Fuji Paudal Co., Ltd.), and 500 parts of kneaded water in which 9 parts of sodium hydroxide was previously dissolved in 491 parts by weight of distilled water were added at room temperature. Then, water was gradually added and kneaded until a uniform product was obtained. Then, the kneaded product is granulated at room temperature using an extrusion granulator (DG-L1 type, manufactured by Fuji Paudal Co., Ltd.) equipped with a screen of a dome-shaped die having a pore diameter of 0.8 mm. Dryer (2F type, manufactured by Fuji Paudal Co., Ltd.)
The kneading water was evaporated at 80 ° C. to obtain 3000 parts of a granulated product containing 25% of sodium azide. On the other hand, after granulation under the same composition and conditions, the granulated product is directly charged into a granulator and sized, and then heated to 80 ° C. with a fluid bed dryer (2F type, manufactured by Fuji Paudal Co., Ltd.). And dried to obtain 3000 parts of the product.

Example 2 1000 parts of sodium azide powder (manufactured by Toyo Kasei Co., Ltd.) having a mesh size of 80 mesh or less
It was added to 774 parts of clay (Aclay manufactured by Katsumitsu Mining Co., Ltd.) and mixed well. Further, 200 parts of pregelatinized modified starch (manufactured by Sanwa Starch Co., Ltd., Corn Alpha Y) and 20 parts of white carbon (manufactured by Tokuyama Co., Ltd., Tokusil GUN) were added and mixed. Co., Ltd., DHJ-10 type), 240 parts of kneaded water in which 6 parts of sodium hydroxide were previously dissolved in 234 parts of distilled water were gradually poured, and kneaded at room temperature until uniform. Then, the kneaded product was coarsely granulated at room temperature by an extrusion granulator (DG-L1 type, manufactured by Fuji Paudal Co., Ltd.) equipped with a dome-shaped die screen having a hole diameter of 1.2 mm, and then the hole diameter was continuously 0.6 mm. Granulated with a screen. Then, these granulated products are fluidized bed dryers (2F type, manufactured by Fuji Paudal Co., Ltd.)
The water content was removed by evaporation at 80 ° C. to obtain 2,000 parts of a granulated product containing 50% of sodium azide. On the other hand, after granulation under the same composition and conditions, the mixture was sized and dried in the same manner as in Example 1 to obtain 2000 parts of a product.

[Example 3] Sodium azide powder (Toyo Kasei Co., Ltd.) pulverized to 80 mesh or less 564
Clay (Atsu clay manufactured by Katsumitsu Mining Co., Ltd.) 22
77 parts were added and mixed well. Further, 120 parts of polyvinyl alcohol (Gosenol GL- manufactured by Nippon Gosei Co., Ltd.)
05S), and 30 parts of white carbon (Tokusyl GUN, manufactured by Tokuyama Corporation), and then the entire amount thereof was kneaded (Model DHJ-10, manufactured by Fuji Paudal Co., Ltd.).
And 9 parts of sodium hydroxide beforehand in distilled water 3
374 parts of kneaded water dissolved in 65 parts were gradually poured, and kneaded at room temperature until uniform. The kneaded product uniformly moistened was subjected to an extrusion granulator (DG-L, manufactured by Fuji Paudal Co., Ltd.) having a dome die type screen having a hole diameter of 0.8 mm at room temperature.
(Type 1). Thereafter, the water content of these granules was removed by evaporation at 80 ° C. using a fluid bed dryer (2F type, manufactured by Fuji Paudal Co., Ltd.), and 3000 parts of granules containing 18.8% of sodium azide were removed. I got On the other hand, after granulation under the same composition and conditions, the mixture was sized and dried in the same manner as in Example 1 to obtain 3000 parts of a product.

Example 4 In the same manner as in Example 3, except that 120 parts of polyvinyl alcohol was replaced with 120 parts of sodium carboxymethylcellulose (Cellogen 7A, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and the same procedure was followed. To give granules containing 18.8% sodium azide
Parts and 3000 parts of product.

[Comparative Example 1] A sodium azide powder previously finely ground to 80 mesh or less (Toyo Kasei Co., Ltd.)
566 parts of talc (manufactured by Nippon Talc Co., Ltd., SW
B) Add to 2284 parts and mix. In addition, polyethylene glycol 6000 ground to 60 mesh or less in a mortar
(Reagent, manufactured by Wako Pure Chemical Industries, Ltd.) 150 parts of powder is mixed with 330 parts of kneaded water that has been heated in advance to prepare a uniform paste-like liquid. The whole amount of the powder mixture was put into a kneader (Model DHJ-10, manufactured by Fuji Paudal Co., Ltd.), and kneaded at room temperature while adding the whole amount of the prepared solution from above. The kneaded product was kneaded with the naked eye until the appearance of the kneaded product became uniform, and the kneaded product was extruded with a dome-shaped die screen having a hole diameter of 0.8 mm (DG-L1 manufactured by Fuji Paudal Co., Ltd.). ) And granulated at room temperature. The whole amount of the granulated product was put into a fluid bed dryer (2F type, manufactured by Fuji Paudal Co., Ltd.),
The water used for kneading was evaporated and distilled off to obtain 3000 parts of a granulated product containing 18.8% of sodium azide. On the other hand, after granulation under the same composition and conditions, the mixture was sized and dried in the same manner as in Example 1 to obtain 3000 parts of a product. However, in the obtained product, as compared to Examples 1 to 4, cracks and chips were conspicuous in each of the product granules, and the shape was uneven.

[Comparative Example 2] In the same manner as in Comparative Example 1, before granulation, the granulated product was loosened by hand until it became fine to some extent, and then the granulated product was sieved by being put into a granulator. A product was obtained in the same manner as in Comparative Example 1 except for the above. However, in the obtained product, as compared to Examples 1 to 4, cracks and chips were conspicuous in each of the product granules, and the shape was uneven.

Comparative Example 3 In the same manner as in Comparative Example 1, polyethylene glycol 6000 (a reagent manufactured by Wako Pure Chemical Industries, Ltd.) was pulverized to 60 mesh or less without the step of preparing a paste-like liquid. After mixing with the other powder raw materials in the powdered state, the mixture was kneaded with a kneader at room temperature while gradually adding 330 parts of kneaded water until the mixture became uniform. An attempt was made to granulate the kneaded product at room temperature by using an extrusion granulator (DG-L1 manufactured by Fuji Paudal Co., Ltd.) equipped with a screen of a dome-shaped die having a hole diameter of 0.8 mm. The elasticity of the kneaded product was insufficient and the shape after passing through the screen could not be maintained, and granulation could not be performed. The relationship between the water absorption of the binder used in the examples and the comparative examples and the granulation yield is summarized in the comparative table of Table 1.

[0041]

[Table 1]

As is clear from this table, when the amount of water absorption is in a specific range, it is possible to obtain the target granule in a high yield. On the other hand, when the water absorption is out of the range, as shown in Comparative Examples 1 and 2, a step of once dissolving the binder in water or a complicated step of loosening by hand before the sizing step is required, and the productivity is reduced. In addition to being low, there is further unevenness in the shape, resulting in poor commercial value. In addition, if the process such as loosening by hand is not performed, the product yield decreases. Furthermore, as shown in Comparative Example 3, when only water is separately added similarly to Examples 1 to 4, it can be seen that granules cannot be produced.

[0043]

The granular soil treating agent for biological control of the present invention comprises:
Since it is possible to efficiently produce a product having an appropriate particle size and containing an azide compound at a high loading and to provide a granular soil treatment agent for biological control having a high commercial value as an agricultural chemical,
The industrial effects they produce are exceptional.

Claims (5)

[Claims] 1. Biological control comprising an azide compound capable of generating hydrogen azide by decomposition (component A), a bulking agent (component B), and a binder (component C) having a water absorption of 200 to 1200 ml / 100 g. For granular soil treatment agent. 2. The granular soil treating agent for biological control according to claim 1, wherein the C component is a pregelatinized modified starch and / or an alkali salt of carboxymethylcellulose. 3. The biocontrol agent according to claim 1, wherein the B component comprises at least one selected from talc, pyrophyllite-based pyroxene clay, ziglite, calcium carbonate, and slaked lime. Granular soil treatment agent. 4. A granular soil treatment agent for biological control comprising A component, B component and C component, wherein the A component is 10 to 70% by weight, the B component is 30 to 90% by weight, and the A component and the B component The C component is 1 to 25 parts by weight with respect to 100 parts by weight in total, and the weight ratio of the C component to the A component is 0.1.
The granular soil treating agent for biological control according to any one of claims 1 to 3, which is 1.0 to 1.0. 5. Component A is 15 to 60% by weight, and Component B is 4% by weight.
0 to 85% by weight, and 3 to 15 parts by weight of the component C with respect to 100 parts by weight of the total of the component A and the component B;
The granular soil treating agent for biological control according to claim 4, wherein the weight ratio of the component C to the component is 0.15 to 0.40.