| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition by coating a fertilizer or the like with coating film material(s) so as to enable the biodegradation rate of the coating film(s) to be moderately controlled to the purpose and fertilizer effect duration to be regulated and, after eluting fertilizer ingredient(s), allow the coating film(s) not to be persistent in soil through being disintegrated and decomposed by soil microorganisms, namely, allow the coating film(s) to vanish after crop cultivation period. SOLUTION: This composition is obtained by coating a granular fertilizer with a coating film material A singly or a mixture of the coating film material A and another coating film material B; wherein the coating film material A comprises a terminal-controlled aliphatic polyester which is composed of at least one kind of monomer unit, either lactone or lactide, with the number rate of the alcohol terminals to the total terminal of the aliphatic polyester being <=50% and/or the number rate of the carboxylic acid terminals to the total terminal of the aliphatic polyester being <=30%, and the coating film material B is at least one kind selected from olefin polymers and others.
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