| 摘要 |
PROBLEM TO BE SOLVED: To stably produce a coated granular fertilizer by spray-coating the surface of a granular fertilizer with a liquid containing a sugar polymer o the derivative and a resin and having a specific viscosity by using spray nozzle having a specific aperture. SOLUTION: As the sugar polymer or the derivative, a corn starch, an enzyme denatured starch or a chemically denatured starch each having 1-100μm particle diameter is preferably used usually by 1-80 wt.% of the resin. As the resin, a polyolefin resin such as thermoplastic PE or PP is desirably used. In addition, if necessary an inorganic material as a filler of the resin, an organic metallic compound accelerating biological decomposition of the resin, a hydrocarbon base or a chlorinated hydrocarbon for dissolving the resin can be used. The viscosity of the liquid is preferably 0.5-100 cP. By using the spray nozzle having 0.9-3.0 mm aperture, the possibility of clogging of a liquid supply pipe line is decreased and the stable production is performed.
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