| abstract |
Provided is a means by which excellent plant growth promoting effect of a 5-aminolevulinic acid can easily be achieved even by a few applications. A solid fertilizer characterized by comprising (A) a 5-aminolevulinic acid represented by general formula (I): R 2 R 1 NCH 2 COCH 2 CH 2 COR 3 (I) [wherein R 1 and R 2 are each independently a hydrogen atom, alkyl, acyl, alkoxycarbonyl, aryl or aralkyl; and R 3 is hydroxy, alkoxy, acyloxy, alkoxycarbonyloxy, aryloxy, aralkyloxy or amino], a derivative of the same or a salt thereof and (B) a solid fertilizer raw material. |