JPH0745353B2 - Agricultural material coated granular fertilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) In the present invention, a core is formed by covering the surface of a granular fertilizer with a mixture of an agricultural material and a film-forming material, and then further covering with a coating material. The present invention relates to an agricultural material-coated granular fertilizer which has the effect of an agricultural material coated on the surface of the granular fertilizer and is doubled in function, and which is applicable to a wide range of plant cultivation fields.

(Prior art) In recent years, due to advances in agricultural technology, fertilizers that are less likely to cause concentration disorders, have less outflow, are fertilizers that can be labor-saving by reducing the frequency of fertilization, especially fertilizers that can supply nutrients that meet plant requirements. Attention has been paid, various fertilizers have been proposed, and some have been put to practical use.

Further, in the healthy cultivation management of plants, it is needless to say that a fertilizer capable of supplying nutrients in a balanced manner according to the requirements of the plants is desirable, but a medium for maintaining a healthy medium that is a survival environment of the plants. There is a demand for improving agents, sterilizing media, insecticides, herbicides for controlling and controlling weeds as competing plants, and plant growth regulators capable of controlling plant growth.

These agricultural materials are applied during or before and after the cultivation period of the plant, and there are many common aspects such as application time and place.

Therefore, from the viewpoint of labor saving work, attempts have been made to use fertilizers and pesticides such as pesticide fertilizers into products, application by blending each granular product, and mixture application as a liquid.

In addition, looking only at the fertilizer, a blend of coated granular fertilizers with various degrees of slow release, a blend of coated granular fertilizer and uncoated granular fertilizer, and a slow-release fertilizer containing coated granular fertilizer It has been proposed to apply granular fertilizer by wrapping the surrounding area with immediate-acting or slow-acting fertilizer and granulating.

In order to grow a plant soundly, in cultivation management, by applying an appropriate amount of agricultural material in a timely manner, by combining two or more kinds of agricultural materials, a synergistic effect is exhibited,
There is a demand for application methods that can be expected to save labor, be handled safely, and reduce environmental pollution.

Regarding the combination of two or more kinds of agricultural materials, as described above, a blend of different kinds of fertilizers, a mixture of pesticides and fertilizers, and a product have been tried. However, in the case of blending, it is difficult to maintain the uniformity of components such as complicated operation, transportation, and grain separation during application, and mixing fertilizer and pesticide may cause a decrease in efficiency due to chemical reaction, which is limited. Currently, it is only possible to combine them with different materials.

Studies have been conducted in the direction of solving such problems.For example, in Japanese Examined Patent Publication No. 59-30680, a coated granular fertilizer is used as a core, and the surroundings are wrapped with an arbitrary proportion of immediate-acting or slow-acting fertilizer. Proposed granular fertilizer. However, in this granular fertilizer, since water is used when the surface of the coated granular fertilizer is covered with the fertilizer, a drying step must be provided, and the quality of the granular fertilizer changes due to heating due to the complexity of the step.

Further, JP-A-61-125631 teaches a method of coating the surface of a coated fertilizer made of a thermosetting resin with a fertilizer containing a pH adjuster. This method causes deterioration of the outer layer film by the fertilizer and the pH adjuster contained in the outer layer film, and elutes the fertilizer component in the outer layer film, and moreover, as a film forming material for the outer layer film, the inner layer is It uses the same material as the membrane. This relates to deterioration of not only the outer layer film but also the inner layer film during the storage period, and affects not only the fertilizer component in the outer layer film but also the accelerated elution of the components of the core coated fertilizer.

Further, the aforementioned Japanese Patent Publication No. 59-30680 and Japanese Patent Laid-Open No. 61-12563.
In No. 1, all the fertilizer components coated on the surface of the coated granular fertilizer are separated from the fertilizer quickly, and the fertilization rate greatly differs from the components in the fertilizer.

(Problems to be Solved by the Invention) The present invention provides a fertilizer in which agricultural materials are combined, which does not have the drawbacks found in the above-mentioned conventional techniques and which is applicable to a wide range of plant cultivation fields. It is the one we are trying to provide.

(Means for Solving the Problems) The present inventors have made it possible to coat the surface of a granular fertilizer serving as a core with an agricultural material, and further, by coating the granular fertilizer and the agricultural material, the effect of the granular fertilizer and the agricultural material can be maintained. The membrane material was examined. As a result, the film-forming material consisting mainly of the film-forming material A group substance mainly used for the coated granular fertilizer as the core or a mixture with the film-forming material B group substance having a modifying effect is used as a solvent. The present invention was completed by coating the surface of the coated granular fertilizer serving as the core while dispersing the fine powder of the agricultural material in the solution or the partially-dispersed solution.

That is, the present invention is to provide an agricultural material-coated granular fertilizer in which the granular fertilizer coated with a mixture of a film forming material and an agricultural material is further coated with a film forming material.

The agricultural material coated on the surface of the granular fertilizer has a property that it can be dissolved or dispersed in a solvent solution or a partially dispersed solution of the film forming material, and is a substance soluble in water or a fertilizer component solution. .

The film-forming material used in the method for coating the surface of an agricultural material on the granular fertilizer is dissolved in a solvent that can be recovered in the coating process, and after recovering the solvent, a property that the agricultural material can be retained in the film when forming a film. As a film forming material, olefin polymer, copolymer containing olefin, vinylidene chloride polymer, copolymer containing vinylidene chloride, diene polymer, waxes, petroleum resin, natural resin, A film-forming material A group consisting of one or more substances selected from fats and oils and modified products thereof, or one or more selected from water-soluble resins such as ethyl cellulose, polyethylene glycol, and polyethylene oxide. A mixture with the film-forming material B group consisting of the above substances is used.

The olefin polymer is polyethylene, polypropylene, ethylene / propylene copolymer, polybutene, butene / ethylene copolymer, butene / propylene copolymer,
Polystyrene and the like, and the copolymer containing olefin, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, ethylene / methacrylic acid copolymer, ethylene / Methacrylic acid ester copolymers, ethylene / carbon monoxide copolymers, ethylene / vinyl acetate / carbon monoxide copolymers, etc., and vinylidene chloride-containing copolymers are vinylidene chloride / vinyl chloride copolymers. The diene polymer is a butadiene polymer, an isoprene polymer, a chloroprene polymer, a butadiene / styrene copolymer, an EPDM polymer, a styrene / isoprene copolymer, etc., and the waxes are dense waxes. , Wax, paraffin, etc., natural resin is natural rubber, rosin, etc., and fats and oils and its modified products are hardened products, solid products. Examples include fatty acids and metal salts.

The agricultural material in the present invention is a chemical substance used in management necessary for healthy growth of plants, and specifically, fertilizers, soil conditioners, fertilizers, agricultural agents, plant growth. Examples include regulators.

As a fertilizer, when coexisting in coated granular fertilizer,
Components that become insoluble due to chemical reaction and become difficult to elute, such as magnesia, lime and iron, manganese that easily react with phosphoric acid,
Trace amounts of salts such as copper and zinc, and among coated granular fertilizers, there are phosphates and potassium salts that elute later than nitrogen components.

Examples of the soil improver include a water-absorbing substance having a water-retaining property for stabilizing the elution of the coated granular fertilizer, an oxide of an alkaline earth metal that corrects soil pH, a hydroxide, and a carbonate.

The fertilizer enhancers include organic fertilizers effective for activating useful components such as phosphoric acid in soil, for example, nitrohumic acid and its salts, organic acids such as citric acid and its salts.

Examples of agricultural chemicals include herbicides as soil treatment agents, permeable insecticides, nematicides, and fungicides against soil diseases.

As a plant growth regulator, plant growth by soil treatment,
It is a drug whose quality can be improved and controlled, and for example, an oxygen generating agent such as lime peroxide, a tea plant quality improving agent such as monoethylamine, a dwarfing agent, and a growth promoting agent are targeted.

In coating the surface of the granular fertilizer with the film-forming material and the agricultural material, the solvent solution of the film-forming material can be applied at a concentration within the range of 1.0 to 10.0%. In this case, although there is a composition in which some of the film-forming material is dispersed, the concentration of the film-forming material is important for favorably dispersing the agricultural material, and the practically preferable concentration range is 2 to 8%. .

The ratio of the film-forming material to the agricultural material can be within the range of 5:95 to 95: 5 by weight. As the proportion of film-forming material increases, the adhesion of agricultural materials increases, but the elution rate of components from product fertilizer may be abnormally delayed, including the subsequent coating process, and the proportion of film-forming material should be reduced. The range of 50:50 to 20:80 is preferable because the adhesion of agricultural materials is reduced.

Also, for granular fertilizer coated with a mixture of film-forming material and agricultural material, as the film-forming material to be further coated, one having the same properties as the film-forming material mixed with the agricultural material described above is used. And coated under similar conditions.

As the production method of the present invention, the method and apparatus shown in the examples of JP-A-62-197385, that is, the granular fertilizer is charged from the fertilizer charging port of the jet tower having the fertilizer charging port and the exhaust gas discharge port, and from the blower. It can be carried out by using a method and an apparatus in which a jet flow is formed while the blown air is blown, and the coating liquid is sprayed toward the jet flow through a fluid nozzle.

(Example) Next, several examples are shown.

Example 1: Magnesium, in the case of trace elements Granular product of phosphorous nitrate Akari (15-15-15) (particle size 2.38 to 3.84 m
When coating the surface of m) with a salt of minor elements and trace elements,
110.0 kg of the granular fertilizer, polyethylene, ethylene-
Includes 1.0 kg of film-forming material consisting of vinyl acetate copolymer (50:50 by weight) and 4.0 kg of the following magnesia and trace element salts 5
% Perchlorethylene solution was prepared. Incidentally, as the magnesia salt, 2.13 kg of oxidized magnesia, as trace element salts, chelated iron 1.23 kg, manganese sulfate 0.21 kg, copper sulfate 0.16 kg, zinc sulfate 0.05 kg, sodium molybdate 0.07 kg, sodium borate 0.15
A mixture consisting of kg was used. These are in a weight ratio of 1: 4 with respect to the film forming material. This was subjected to coating treatment in a jet coating apparatus under the temperature condition of 70 ° C. Then, using the same jet type coating device, polyethylene, ethylene-vinyl acetate copolymer, talc as a coating agent, perchlorethylene as a solvent, octaoxyethylene nonyl phenyl ether as an elution control agent, a coating treatment is performed, and nitrogen is applied. As a component, a coated granular fertilizer with an 80% dissolution rate reaching 85 days in water at 25 ° C was prepared.

The results of examining the elution of components for the product and the coated granular fertilizer used as the core showed that there was no great difference in nitrogen and potassium between the fertilizers, but in the case of the present invention, a tendency to suppress the initial elution slightly was observed, This was a favorable property for fertilizer management.

The elution of phosphoric acid tended to be slightly delayed in the product of the present invention. For magnesia and trace components, it was eluted at the same speed as the three main components.

Example 2 Using the same granular fertilizer and jet-type coating device used in Example 1, production was carried out under the materials and operating conditions shown in Table 1.

(Effects of the Invention) By covering the surface of granular fertilizer with an agricultural material and then by covering with a covering material, a product as a comprehensive agricultural material having various functions and easy to cope with efficient plant management can be obtained. .
The synergistic effect of the effect of the coated granular fertilizer and the effect of the coexisting agricultural material is obtained, and thus, the effects of promoting the growth of plants, improving the quality, and further improving the medium are obtained.

Claims (2)

[Claims] 1. An olefin polymer, an olefin-containing copolymer, a vinylidene chloride polymer, a vinylidene chloride-containing copolymer, a diene polymer, a wax, a petroleum resin, a natural resin, an oil and fat and its modified products. 1 or 2
A film-forming material A group consisting of one or more substances, or a mixture with a film-forming material B group consisting of one or more substances selected from ethyl cellulose and water-soluble resins of polyethylene glycol and polyethylene oxide. An agricultural material-coated granular fertilizer, characterized in that the granular fertilizer coated with a mixture of a film forming material and an agricultural material is further coated with a film forming material. 2. The mixing ratio of the film forming material and the agricultural material is 5:95 to 95: 5.
The agricultural material-coated granular fertilizer according to claim 1, wherein