<；P>；PROBLEM TO BE SOLVED: To provide a coated granular material which is coated with a resin decomposable in soil, has excellent elution controllability for a bioactive substance and contains the bioactive substance. <；P>；SOLUTION: The coated granular material is prepared by coating the bioactive substance-containing granular material with the urethane resin obtained by reacting an aromatic polyisocyanate with a polyester polyol having an oxycarbonyl [-O-C(=O)-] partial structure in a ratio of &ge；15% (by weight) in a molecule and a polyol containing a diol expressed by general formula (1) [in the formula, Z expresses Z<；SP>；1<；/SP>；or Z<；SP>；2<；/SP>；CO<；SB>；2<；/SB>；CH<；SB>；2<；/SB>；and Z<；SP>；1<；/SP>；and Z<；SP>；2<；/SP>；respectively express a 4-30C linear hydrocarbon group]. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
