| 摘要 |
PROBLEM TO BE SOLVED: To obtain an S-type coated fertilizer having a long period of elution inhibiting time with a thin film by forming a film containing a mixture of an olefin homopolymer and a copolymer of ethylene withα-olefin on the surface of a granular fertilizer. SOLUTION: This coated granular fertilizer is not particularly restricted and a granular straight fertilizer such as urea, ammonium sulfate, ammonium chloride, potassium chloride or ammonium phosphate or a granular fertilizer containing multicomponents such as N1, K2 O or P2 O5 is used as a raw fertilizer. Preferably, the coated granular fertilizer has 0.5-4mm diameter and spherical or nearly spherical shape. A coating material is composed of a main component polymer and an additive such as a surfactant, etc. The first component as the main component polymer of the basic material is more than one kind of a polyethylene resin, a polypropylene resin, etc., as a homopolymer of olefin and the second component is a copolymer of ethylene withα-olefin, especially propene or 1-butene. A blending ratio of the second component is 1-80wt.% of the first component.
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