| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coated granular fertilizer whose coating film can be collapsed due to its change into a porous film and due to its oxidative degradation and which is free from the change of elution, also after preserved, by covering the surface of the granular fertilizer with a coating film containing a specific thermoplastic resin and a particulate material as active components. SOLUTION: This soil degradation type coated granular fertilizer is obtained by covering the surface of a granular fertilizer with the coating film of a composition comprising a thermoplastic resin containing a substance for accelerating the oxidation of the polymer and watersoluble and nonvolatile particles as active components. The thermoplastic resin includes a polyolefin and its copolymer, and polyvinylidene chloride and its copolymer. The substance for accelerating the oxidation of the polymer includes a dienic polymer having C=C double bonds, a transition metal and a transition metal compound. The water-soluble and nonvolatile particles include the particles of polyols, polyethers, isobutylene polymer, salts and saccharides. The diameter of the particles is preferably 0.5-100μm.
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