JPH07206564A - Agrochemical-coated granular fertilizer and its production - Google Patents

Abstract

PURPOSE:To obtain an agrochemical-coated granular fertilizer capable of enhancing the absorption and utilization rate of both agrochemical and fertilizer, realizing the reduction in environmental load and promoting the labor saving in using the agrochemical by coating the surface of a granular fertilizer with an agrochemical active ingredient using a binder. CONSTITUTION:This method for producing an agrochemical-coated granular fertilizer is to add a solution of a mixture of an agrochemical active ingredient with a degradable polyester, derived from a monomer selected from the group consisting of epsilon-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate and expressed by chemical structures of formulas I to IV in a solvent in a spray state to a granular fertilizer in a fluid state, blow a high-speed hot air stream thereon, remove and dry the solvent. The resultant agrochemical-coated fertilizer contains about 0.05-10wt.% coating agent and about 0.01-15wt.% agrochemical active ingredient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pesticide-containing coated granular fertilizer obtained by coating the surface of a coated granular fertilizer with an agricultural chemical and a method for producing the same. More specifically, the core is a binder and a pesticide consisting of a degradable polyester derived from one or more monomers selected from the group consisting of ε-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate. The present invention relates to a coated granular pesticide fertilizer suitable for plant cultivation due to the synergistic effect of coating the coated granular fertilizer with the effect of the pesticide on the effect of the fertilizer.

[0002]

2. Description of the Related Art In recent years, various types of slow-release fertilizers have been studied which can supply nutrients according to the nutrient requirements of plants by freely controlling the release of fertilizer components. Since the organic synthetic slow-release fertilizer is affected by soil moisture, pH, microbial action, etc., the fertilizer components were not stably supplied, and the supply rate was insufficiently controlled. On the other hand, coated granular fertilizers that can control the elution of fertilizer components without being much influenced by the soil environment have been developed and gradually put into practical use. In recent years, control of period / pattern and timed elution has been put to practical use.
The fertilizer application amount for up to 3 crops can be filled with one fertilization, and labor saving of agricultural work can be achieved. Particularly in mulch cultivation, top dressing is performed by removing the mulch film, and it can be said that the effectiveness is high because the series of top dressing operations is eliminated. Furthermore, the improvement of the nutrient absorption and utilization rate of the plant was brought about by reducing the loss of fertilizer due to runaway without being absorbed by controlling so that the amount required for absorption and utilization is eluted. This makes it possible to neglect the impact of fertilizer on the environment. Also, various pesticides are used to obtain stable yields. For example, paddy rice is applied with insecticides, fungicides, herbicides and the like. In recent years, box-applied granules have been developed as a labor-saving application method, which has realized labor-saving in pesticide application.
Management work for cultivating plants includes, for example, plowing, leveling, rice planting, weeding, and harvesting for paddy rice, and basic fertilizer for fertilizer,
There is additional fertilization. Of these, most of the work such as plowing, rice planting and harvesting is mechanized and labor-saving. About fertilizer,
All basic fertilizer cultivation and side-row fertilization technology are known, and labor is reduced in fertilizer application according to mechanization of work. The present inventors have invented and disclosed a technique for coating a fertilizer with a polymer material and controlling the dissolution rate so far. For example, Japanese Patent Publication No. 50-99858, Japanese Patent Publication No. 60-37074, Japanese Patent Publication No. 60-3040 and the like. These elution control technologies are basically technologies for controlling the elution period,
In other words, it is a technology for controlling the elution rate, which represents the elution amount per period or time. With these techniques, products that can freely obtain desired fertilization effects for a short and long term are provided, and revolutionary agricultural techniques such as total amount basic basal cultivation without additional fertilization have been established. In the field of pesticides, it is possible to apply granules to rice seedling boxes, and many products are on the market, but these are generally applied from several days before transplantation to the transplantation date, so the utilization rate is high. . Moreover, disease can be prevented labor-savingly by the treatment of planting holes at the time of transplanting fruits and vegetables. However, the fertilizer and pesticide are applied separately to the entire cultivation system, which is an obstacle to the construction of a labor-saving cultivation system.
If fertilizer and pesticide can be contained in one granule, they can be applied at the same time, which enables further labor saving of agricultural work. The present inventors believe that simultaneous application of these coated fertilizers and pesticides with residual effects is effective for constructing a labor-saving cultivation system,
The application method was examined. As a simultaneous application method, there is application of pesticides and fertilizers mixed and applied, but in general, when pesticides and fertilizers are mixed, in many cases the pesticide components themselves decompose and the effect of pesticides decreases or disappears. it is conceivable that. Although there is a merit that it is easy to handle, there is concern about decomposition of pesticides as in the case of, and the application method that maximizes the respective effects of fertilizers and pesticides is still unknown. If these pesticides can be applied together with slow-release fertilizers, controlled-release fertilizers, etc., the utilization rate of pesticides can be improved. In this case, if a mixture of pesticide and fertilizer is used, the size of the pesticide granules and the size of the fertilizer will generally not be uniform, or the pesticide active ingredient will be decomposed during blending due to the problem There is a problem. Various attempts have been made to solve such problems. For example, Japanese Patent Laid-Open No. 1-15
No. 7493 proposes a pesticide fertilizer in which the pesticide component particles are coated with a water-insoluble low melting point waxy substance that is solid at room temperature and are supported on the core fertilizer by using granular fertilizer as a core. This is an unfinished technology because fertilizer and pesticide can be applied simultaneously because they are in one granule, but the elution of fertilizer is unstable. JP-A-2-38
393 proposes an agrochemical fertilizer manufactured by impregnating or coating a fertilizer and a water-soluble binder with an agricultural chemical. This may cause decomposition of the pesticide due to contact between fertilizer and pesticide,
The elution of fertilizer has not been solved at all compared to the above-mentioned JP-A-1-157493. Japanese Patent Laid-Open No. 2-1960
No. 79 proposes coating of agricultural chemicals with olefinic resin, etc., but when a material with low moisture permeability is used, precise elution control of the core coated granular fertilizer is impaired, and the coating material is generally difficult to decompose. Therefore, there is concern about residual pesticides.

[0003]

Therefore, the present inventors have strong demands from farmers and agricultural engineers, and by applying agricultural chemicals and fertilizers at the same time, labor saving, reduction of application amount, prevention of river and groundwater pollution, etc. For fertilizer having the effect of
I focused on the following points. That is, even if the pesticide is coated on the surface of the coated granular fertilizer to make the pesticide active ingredient coexist in the coated granular fertilizer to form one granule, the elution rate of the nuclear coated granular fertilizer should not be affected (precision control is impaired. It is to obtain a fertilizer that satisfies the condition that the pesticide active ingredient does not remain on the membrane and that the production is easy. As a result of earnest research on pesticide fertilizers to satisfy the above-mentioned aims, when the coated granular fertilizer is coated with a binder composed of a degradable polyester and / or a composition of degradable polyester and a pesticide, precise elution control of the fertilizer is impaired. The present invention has been completed by discovering that the effects of pesticides and fertilizers can be fully exerted without them, and that a synergistic effect thereof can be obtained to obtain a pesticide fertilizer that complements a labor-saving cultivation system. As is clear from the above description, the object of the present invention is to improve the absorption utilization rate of pesticides and fertilizers without impairing the precise elution control of coated granular fertilizers, realize the reduction of environmental load, and promote labor saving of pesticides. It is to provide the coated granular pesticide fertilizer at a low price.

[0004]

The present invention has the following constitution. (1) A coated granular pesticide fertilizer characterized in that the surface of the coated granular fertilizer is coated with a pesticide active ingredient using a binder. (2) The coated granular pesticide fertilizer according to (1), wherein the pesticide active ingredient is at least one kind or two or more kinds selected from insecticides, fungicides, herbicides and plant growth regulators. (3) The coated granular pesticide fertilizer according to (1) above, wherein the binder contains degradable polyester as an essential component. (4) The degradable polyester is derived from a monomer selected from the group consisting of ε-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate, and has one or more of the following chemical structures of Chemical formulas 5 to 8 The coated granular pesticide fertilizer according to (3) above, which is a polyester represented by.

[0005]

[Chemical 5]

[Chemical 6]

[Chemical 7]

[Chemical 8] (5) Coated granular fertilizer in a fluid state with a solvent solution of a mixture of an agrochemical active ingredient and a degradable polyester derived from a monomer selected from the group consisting of ε-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate. A method for producing a coated granular pesticide fertilizer, which comprises adding a spray form to, and spraying a high-speed hot air stream to the coated granular fertilizer at the time of addition to remove the solvent in the mixed solution added and to dry the coated granular fertilizer.

The structure and effect of the present invention will be described in detail below. In the present invention, a coated granular fertilizer is coated with a binder and a pesticidal active ingredient composed of the above-mentioned degradable polyester and / or a composition of a degradable polyester. It is a coated granular pesticide fertilizer obtained by coating the surface of the fertilizer with components. The pesticide fertilizer of the present invention avoids decomposition of the pesticide active ingredient due to contact between the pesticide and the fertilizer, and the root group formed around the coated granular fertilizer can increase the absorption utilization rate of the pesticide as well as the fertilizer. it can.

The pesticide active ingredient that can be used is one that can be applied to soil. It mainly absorbs from roots and stems and is a systemic insecticide and fungicide that has the property of migrating to the whole plant. Herbicide for paddy field. Soil insecticide. Herbicide for field. It is an agent.
Among these, the osmotic insecticides and fungicides are those which are absorbed by the plant and exert the effect as pesticides, and the application method is important, but the dosage form is mostly granules. Regarding the fertilizer, the coated granular fertilizer enabled precise elution control. In other words, it is hardly affected by the soil environment other than temperature, so a stable fertilizing effect can be obtained, and the elution amount of fertilizer components over time can be quantitatively predicted due to the fact that the effect of temperature has a certain law. You can As a result, by using a fertilizer that matches the absorption pattern of the crop, the absorption utilization rate of fertilizer components is dramatically improved, and the environmental load can be reduced. These agricultural materials are applied separately, and in the case of pesticides, for example, application of seedling boxes of granules can be said to have a higher absorption utilization rate than full-layer application, but this is not sufficient, and by supplementing this The absorption utilization rate can be further increased. The inventors of the present invention have conducted a search research to solve these problems, and as a result, have made a coating material composed of a pesticidal active ingredient excellent in permeation migration and a degradable polyester and / or a composition of degradable polyester into a coated granular fertilizer. The present invention was completed by coating. The agricultural chemical fertilizer of the present invention attracts roots by the coated granular fertilizer serving as a core, and has a rhizosphere around the fertilizer. As a result, the fertilizer components and pesticides eluted from the pesticide fertilizer can be absorbed and absorbed, the absorption utilization rate can be increased, and the amount of pesticide applied can be reduced. Also,
Since the pesticide and fertilizer are one particle, labor saving in application can be realized.

A degradable polyester and / or a composition of a degradable polyester is used as a binder, which is a material having a moisture permeability that does not affect the precise elution control of the core coated granular fertilizer and the binder is degradable. This is because the presence of the pesticide active ingredient is avoided by having Further, the elution of the agricultural chemical active ingredient can be controlled by adjusting the decomposition rate of the degradable polyester and / or the composition of the degradable polyester.

In the coated granular pesticide fertilizer of the present invention, all the pesticide components are 0.01 to 15 by weight as the whole pesticide fertilizer.
%, Preferably 0.05 to 5%, and in lateral fertilization, about 3% is preferable although it depends on the pesticide active ingredient. The coating agent is 0.05 to 10%, preferably 0.
1 to 5%. In addition, stabilizers for agrochemical active ingredients can be added as appropriate, and these stabilizers can be added to the extent that the effects of the present invention are not impaired.

Polymers having various structures are known as degradable resins. Most of them are polymers that have a bond such as ester bond, amide bond, orthoester bond, acetal bond, ketal bond, acid anhydride bond, and carbonate bond that is easily hydrolyzed or enzymatically decomposed (easily decomposable bond) in the molecular structure. Is.

Examples of the degradable resin according to the present invention include poly-ε-caprolactone, poly-δ-valerolactone,
Poly-lactones such as poly-β-propiolactone, poly-γ-butyrolactone, polylactic acid and polyglycolic acid,
Polyhydroxyalkanoates such as poly-3-hydroxybutyrate and poly-3-hydroxyvalerate, chitin, chitosan, poly-p-dioxanone, trimethylene carbonate polymer, polymalic acid, acid anhydride polymer, polyvinyl alcohol , Polyalkyl cyanoacrylate, amylose, starch, polysaccharides such as dextran, and copolymers thereof.

Among these resins, poly-ε-caprolactone and poly-ε are preferably used in the present invention.
Polylactones such as δ-valerolactone, poly-β-propiolactone, poly-γ-butyrolactone, polylactic acid and polyglycolic acid, and polyhydroxyalkanos such as poly-3-hydroxybutyrate and poly-3-hydroxyvalerate. It is polyester represented by ate,
More specifically, it is a polyester having at least ε-caprolactone unit and / or lactic acid unit and / or glycolic acid unit and / or 3-hydroxybutyrate unit in a molecular structure which is easily decomposed when applied to soil or water. is there.

The polylactic acid monomer, which is one of the degradable polyesters essential to the present invention, includes L-form, D-form, D, L-form.
There are three types of optical isomers, and the body of the present invention can be achieved by any of these.

The degradable polyester and / or the composition of the degradable polyester essential to the present invention can give a very good film in terms of disintegration in soil, and when it is coated with a homopolymer, the film is hard, It has the function and physical properties that it becomes brittle. The decomposition rate of the degradable polyester and / or the composition of the degradable polyester is different depending on the type, but even if it is an arbitrary composition composed of these, the effect of the present invention is not impaired and the physical properties of the coating film are improved. It can be used for a purpose such as a filler. When these resins are mixed, the type and proportion of the coating material are determined from the viewpoint of the physical properties of the coating to be decomposed in soil.

In the case of the polylactic acid of the decomposable polyester essential to the present invention, the homopolymer composed of a single monomer has the brittle property as mentioned above. Since a coating film may crack during transportation, a copolymer having excellent flexibility or a method in which a homopolymer is appropriately mixed and used, and a copolymer having different optical isomers such as L-isomer and D, L-isomer Coalescence, or a method of appropriately using the homopolymer and the homopolymer, is a desirable method for improving the physical properties of the coating film. Further, in terms of degradability, a copolymer with a different optical isomer or a different monomer tends to have a faster decomposition rate than a homopolymer, and it is possible to control the decomposition rate by a combination of these. is there. The molecular weight of polylactic acid is preferably 30,000 or more from the viewpoint of coating strength, and the upper limit is preferably 500,000 or less from the operability of the coating process, but a particularly preferable range is 50,000 to 300,000. Thus, for example, by arbitrarily mixing polylactic acids having different molecular weights, it is possible to control the decomposition rate of the coating, and to mix with poly-ε-caprolactone, polyglycolic acid, and poly-3-hydroxybutyrate. The same applies to the composition according to (1) or a mixture with resins having different degradability.

A surfactant may be added to the film. As the surfactant that can be used in the product of the present invention, any of cationic, anionic, amphoteric and nonionic surfactants can be used, but the balance of hydrophilicity and hydrophobicity of the surfactant can be used. is important. If the hydrophilicity is too strong, the particles do not uniformly disperse in the film and aggregate to cause film defects. Those with strong lipophilicity do not affect the coating, but the elution promoting effect tends to be slightly inferior. HL of these surfactants
B is 15 or less, preferably in the range of 11 to 13.

The pesticidal active ingredient in the present invention has any of insecticidal, bactericidal, herbicidal, and plant growth regulating effects, and any of these may be applied without limitation. It is preferably in the form of a solid powder at room temperature, and the saturated vapor pressure at 20 ° C. is preferably 10 ⁻³ mmHg or less. The pesticide active ingredient and the degradable polyester may be compatibilized with a solvent and then coated on the fertilizer. Specific examples of the agrochemical active ingredient that can be used in the present invention are shown below, but these are merely examples and are not limited.
The pesticidal active ingredient may be used alone or in combination of two or more. For example, 1- (6-chloro-3-pyridylmethyl) -N-nitroimidazolidine-2-ylideneamine (generic name: imidacloprid), O, S-dimethyl-N-acetylphosphoramidothioate (generic name: acephate), 1 , 3-Bis (carbamoylthio) -2- (N, N-dimethylamino) propane hydrochloride (generic name: cartap), 3-allyloxy-1,2-
Benzisothiazole-1,1-dioxide (generic name:
Probenazole), 1,2,5,6-tetrahydropyrrolo [3,2,1-ij] quinolin-4-one (generic name:
Pyroquilon), blasticidin-S-benzylaminobenzenesulfonate (generic name: blasticidin S), 2-benzothiazol-2-yloxy-N-methylacetanilide (generic name: mefenacet), methyl = α- ( 4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluate (generic name: bensulfuron-methyl), S- (4-chlorobenzyl) -N, N-diethylthiocarbamate (generic name: ventiocarb) , S-benzyl = 1,2-dimethylpropyl (ethyl) thiocarbamate (generic name: esprocarb), 4- (2,4-dichlorobenzoyl) -1,3
-Dimethyl-5-pyrazolyl-p-toluenesulfonate (generic name: pyrazolate), S-1-methyl-1-phenylethyl = piperidine-1-carbothioate (generic name: dimepiperate), 1- (α, α- Dimethylbenzyl) -3- (paratolyl) urea (generic name: Daimlon), 2,4,6-trichlorophenyl-4′-nitrophenyl ether (generic name: CNP), 2-chloro-
2 ', 6'-diethyl-N- (budoxymethyl) acetanilide (generic name: butachlor), 2-chloro-4,
6-bis (ethylamino) -s-triazine (generic name:
CAT), ethyl 2,4-dichlorophenoxyacetate (generic name: 2,4-PA), ethyl 2-methyl-4-chlorophenoxyacetate (generic name: MCP), 2-chloro-4-
Ethylamino-6-isopropylamino-s-triazine (generic name: atrazine), (E)-(S) -1- (4
-Chlorophenyl) -4,4-dimethyl-2- (1H-
1,2,4-triazol-1-yl) pent-1-en-3-ol (generic name: uniconazole P), (2R
S, 3RS) -1- (4-chlorophenyl) -4,4-
Dimethyl-2- (1H-1,2,4-triazole-1
Examples include -yl) pentan-3-ol (generic name: paclobutrazol) 4'-chloro-2 '-(α-hydroxybenzyl) isonicotinanilide (generic name: inabenfide) and calcium peroxide.

The coated granular fertilizer in the present invention is not particularly limited, but those capable of precise elution control are preferable. A wide range of fertilizer components are used,
It contains at least one of chisso, phosphoric acid and potassium. In addition to these, in addition to magnesium and calcium, chelate iron, iron chloride, iron sulfate, boric acid, borax, manganese sulfate, manganese chloride and zinc sulfate as trace elements. ,
The fertilizer may contain copper sulfate, sodium molybdate, ammonium molybdate, and the like. Examples of fertilizers used in the present invention include sulfur and resins as coating materials, but are not particularly limited. For example, commercially available LP coat (Cisso), long (Asahi Kasei), Ceracoat (central glass), Mcoat (Mitsubishi Kasei) Etc. can be used.

The coated granular pesticide fertilizer of the present invention can be appropriately used by adding other pesticides at the time of application, if necessary.

Although the method for producing the coated granular fertilizer of the present invention, that is, the method for coating the coated granular fertilizer with the agricultural chemical is not particularly limited, for example, the coated granular fertilizer in a rolling or flowing state can be coated with the above-mentioned coating material. There is a method in which the mixed solution is sprayed by means such as spraying to coat the surface of the coating, while the coating is simultaneously and concurrently treated with a high-speed hot air stream to evaporate and dry the solvent on the surface of the coating instantaneously. The fluidization of the coating in this case is most preferably performed using a spouted bed. In the coating method, it is necessary to vigorously stir the coating solution in order to uniformly disperse the degradable polyester and / or the composition of the degradable polyester according to the present invention and the agrochemical active ingredient. The present invention will be described below with reference to examples, but the present invention should not be limited to these examples. All percentages in the examples are weight percentages and all ratios are weight ratios.

Example Production Example 1 An example of production of an invention product will be described below. To prepare the coating solution, put the solvent and binder in a dissolution tank equipped with a stirrer, and heat and stir the solvent to dissolve it. Next, pesticide active ingredients are added, and these coating liquids are constantly stirred to maintain a uniform dispersed state. The composition of the coating liquid is shown in Table 1. The coated fertilizer is coated by putting the coated granular fertilizer in a rotary pan and rolling it, adding hot air and the coating liquid in a spray form to the fertilizer particles, evaporating the solvent to form a coating, and grow the coated granular pesticide. Get fertilizer. FIG. 1 shows a manufacturing apparatus I, which is a coating apparatus of this embodiment. A sugar coating machine with a diameter of 30 cm is used as a rotating pan, and coated granular urea (a total dissolution rate of 80% is 70% when standing still in water at 25 ° C).
(6-8 mesh adjustment product of the day) is put in and rotated at 30 rpm, and 200 m ³ / H at 80 ° C. from a hot air jet with a diameter of 5 cm.
Hot air of (exit temperature) is blown from about 20 cm from the particle rolling surface. After the coating liquid is dissolved and dispersed in the dissolution tank, it is maintained at about 50 ° C with continuous stirring, sent to the spray nozzle attached to the sugar coating machine by the coating liquid pump, and is sprayed with nitrogen gas for spraying. A coated granular pesticide fertilizer was obtained by continuously adding to the moving particles at a supply rate of 2 liters / H so that the particle temperature could be operated in the range of 50 to 55 ° C.

Preparation Example 2 The coating solution was prepared by adding the solvent and binder to a dissolution tank equipped with a stirrer.
The solvent is heated and stirred to dissolve. Next, pesticide active ingredients are added, and these coating liquids are constantly stirred to maintain a uniform dispersed state. The composition of the coating liquid is shown in Table 1. For coating the coated fertilizer, put the coated granular fertilizer in the jet tower and jet it,
Hot air and the coating liquid are added to the fertilizer particles in the form of a spray, and the solvent is evaporated to form and grow a coating to obtain a coated granular pesticide fertilizer. FIG. 2 shows a manufacturing apparatus II, which is a coating apparatus of this embodiment. In the figure, 1 is a jet tower with a tower diameter of 250 mm and a height of 20.
It has a fertilizer inlet 2 and an exhaust gas outlet 3 with a diameter of 00 mm, a nitrogen gas jet diameter of 50 mm, and a cone angle of 50 degrees. The jet nitrogen gas is sent from the blower 10 and reaches the jet tower through the orifice flow meter 9 and the heat exchanger 8. The flow rate is controlled by the flow meter and the temperature is controlled by the heat exchanger, and the exhaust gas is discharged from the exhaust gas outlet 3 to the outside of the tower. Is discharged to. The coated granular fertilizer used for the coating treatment is introduced from the fertilizer inlet 2 while passing a predetermined hot air (nitrogen gas) to form a jet stream. The hot air temperature is T ₁ , the particle temperature during the coating process is T ₂ , and the exhaust temperature is T ₃ .
When T ₂ reaches a predetermined temperature, the coating liquid is sprayed from the pump 6 through the spray nozzle 4 toward the spray-like jet-like particles. The coating liquid is stirred in the dissolution tank 11 so that the pesticide is uniformly dispersed. After the coating is completed, the blower is stopped and the coated fertilizer is extracted from the outlet 7. In this example, coating was performed while maintaining the following basic conditions. One-fluid nozzle: Opening 0.8mm Full-con type Hot air flow rate: 4M ³ / min Hot air temperature: 100 ° C ± 2 ° C Test fertilizer: Coated granular urea (cumulative elution rate of 80% when standing still in water at 25 ° C for 6 days 70- 8 mesh adjusted product) Fertilizer input: 10 kg Test solvent: Toluene Coating liquid supply: 0.3 kg / min

Comparative Examples 1 to 3 Control pesticide fertilizers not belonging to the present invention were produced in the same manner as in Production Example 2. The coating composition of the comparative example is shown in Table 1.

[0024]

[Table 1]

Note * 1 Poly-L-lactic acid Mw = 60,000 * 2 Poly-L-lactic acid Mw = 150,000 * 3 L-lactic acid / glycolic acid copolymer L-lactic acid / glycolic acid = 70: 30 Mw = 100,000 * 4 Poly-D, L-lactic acid Mw = 100,000 * 5 Poly-ε-caprolactone Mw = 10,000 * 6 Poly-ε-caprolactone Mw = 50,000 * 7 3-hydroxybutyrate 3-hydroxyvalerate copolymer Mw = 150,000 3-hydroxyvalerate fraction 20 mol% * 8 Poly-ε-caprolactone Mw = 80,000 * 9 Low density polyethylene MI = 20 d = 0.92
2 * 10 Ethylene / carbon monoxide copolymer MI = 20 C
O = 0.95% by weight * 11 Copolymer-type atactic polypropylene containing 3% of ethylene Mw = 60,000 * 12 Ethylene / vinyl acetate copolymer MI = 20 Vinyl acetate 30% by weight Agrochemical A 1- (6-chloro- 3-pyridylmethyl) -N
-Nitroimidazolidin-2-ylideneamine 70.
5% Mineral fines, etc. 29.5% Pesticide B 2-Chloro-4-ethylamino-6-isopropylamino-s-triazine 75.0% Mineral fines, etc. 25% Pesticide C 2-Benzothiazol-2-yloxy- N-
Methyl acetanilide 87.3% Mineral fines, etc. 1
2.7%

Dissolution test 10 g of each of the fertilizers of the present invention produced in Production Examples I and II was immersed in 200 ml of water and allowed to stand at 25 ° C. After a predetermined period, it is divided into fertilizer and water, and the amount of urea eluted in water is determined by quantitative analysis. Add 200 ml of pure water to the fertilizer and put it at 25 ℃ again.
Then, the same analysis is performed after a predetermined period. By repeating such an operation, urea eluted in water is determined by quantitative analysis. Table 2 shows the results of the relationship between the cumulative amount of urea eluted in water and the number of days after repeating such operations.

[0027]

[Table 2] The stationary days in Examples 1-10 and Comparative Examples 1-3 and the cumulative elution rate are shown.

[Brief description of drawings]

1 and 2 are explanatory views of an apparatus used in a manufacturing example of the present invention.

FIG. 1 is a rotary pan coating device used in Production Example 1.

FIG. 2 is a jet coating device used in Production Example 2.

Claims (5)

[Claims] 1. A coated granular pesticide fertilizer characterized in that the surface of the coated granular fertilizer is coated with a pesticide active ingredient using a binder. 2. The coated granular agricultural chemical fertilizer according to claim 1, wherein the agricultural chemical active ingredient is at least one kind or two or more kinds selected from insecticides, fungicides, herbicides and plant growth regulators. 3. The coated granular pesticide fertilizer according to claim 1, wherein the binder contains a degradable polyester as an essential component. 4. The degradable polyester is derived from a monomer selected from the group consisting of ε-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate, and has one of the following chemical structures of chemical formulas 1 to 4 The coated granular pesticide fertilizer according to claim 3, which is a polyester represented by 2 or more. [Chemical 1] [Chemical 2] [Chemical 3] [Chemical 4] 5. A fluid solution coating of a solvent solution of a mixture of an agrochemical active ingredient and a degradable polyester derived from a monomer selected from the group consisting of ε-caprolactone, lactic acid, glycolic acid and 3-hydroxybutyrate. A method for producing a coated granular pesticide fertilizer, which comprises adding to a granular fertilizer in a spray form and blowing a high-speed hot air stream to the coated granular fertilizer at the time of adding to remove the solvent in the mixed solution added and drying.