| 摘要 |
PROBLEM TO BE SOLVED: To provide a sigmoid elution type surface-coated granular fertilizer that has excellent storage stability and a coating film that has a high strength before application but becomes degradable after application. SOLUTION: This granular fertilizer is coated, on its surface, with the coating film including 10/95 wt.% of a low molecular weight polyolefin with a weight- average molecular weight of 300-10,000 and/or petroleum wax, 89-4 wt.% of an ethylene-α-olefin elastomer with a density of 0.830-0.910 g/cm3 and a melt index of 0.1-50 g/10 min. and 1-30 wt.% of a powder mainly comprising a saccharide polymer or its derivative. When the coating granular fertilizer is used after long-term storage, the elution leakage does not occur by an unexpected decomposition of the coating layer during the initial elution-suppression period. Further, high fertilizer effect and high labor saving are attained by the sigmoid elution and the shell residues of the coating film is degraded in the rice paddies or crop fields and can be used as a high-performance surface-coated granular fertilizer.
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