Abstract: A means for enhancing the yield of a harvesting part of a crop is provided. A yield enhancing agent for a harvesting part selected from the group consisting of seed, fruit, hypocotyl, root and stem in a crop, the yield enhancing agent comprising: 5-aminolevulic acid or a derivative thereof represented by the following formula (1), or a salt thereof; and a gibberellin biosynthesis inhibitor: R2R1NCH2COCH2CH2COR3 (1), wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group or an aralkyl group; and R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group, wherein the yield enhancing agent is an agent to be applied at the time when the harvesting part of the crop becomes enlarged.

Abstract: Provided is a means for achieving an excellent plant growth promoting effect of a 5-aminolevulinic acid easily even with a few applications thereof. A solid fertilizer comprising the following components (A) and (B): (A) a 5-aminolevulinic acid represented by the following general formula (I): R2R1NCH2COCH2CH2COR3??(I) wherein R1 and R2 are each independently a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group, or an aralkyl group; and R3 is a hydroxy group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group, a derivative thereof or a salt of the acid or the derivative, and (B) a solid fertilizer raw material.

Abstract: There is provided an agent for improving the growth of seedlings, having effects of raising healthy rice seedlings, such as increase of the tillering number, increase of root weight, enhancement of greenness, and increase of stem thickness. An agent for improving the growth of rice seedlings containing, as active ingredients, 5-aminolevulinic acid represented by formula (1), a derivative thereof or a salt of the acid or the derivative, and a gibberellin biosynthesis inhibitor: R2R1NCH2COCH2CH2COR3??(1) wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group or an aralkyl group; and R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group.

Abstract: An agent for improving lawn grass quality, which is excellent in promoting dwarfing of lawn grass, making the stem sturdy, increasing the leaf count, and improving greenness, is provided. An agent for improving lawn grass quality containing, as active ingredients, 5-aminolevulinic acid represented by formula (1): R2R1NCH2COCH2CH2COR3??(1) wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group or an aralkyl group; and R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group, or a derivative thereof or a salt of the acid or the derivative, and a gibberellin biosynthesis inhibitor.

Abstract: A means for enhancing the yield of a harvesting part of a crop is provided. A yield enhancing agent for a harvesting part selected from the group consisting of seed, fruit, hypocotyl, root and stem in a crop, the yield enhancing agent comprising: 5-aminolevulic acid or a derivative thereof represented by the following formula (1), or a salt thereof; and a gibberellin biosynthesis inhibitor: R2R1NCH2COCH2CH2COR3 (1), wherein R1 and R2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group or an aralkyl group; and R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group, wherein the yield enhancing agent is an agent to be applied at the time when the harvesting part of the crop becomes enlarged.

Abstract: The invention provides a metal component absorption enhancer which enhances the absorption of at least one metal component selected from the elements belonging to the groups 2 to 12 in the third to fourth periods when a plant grows. An absorption enhancer of at least one metal component selected from the elements belonging to the groups 2 to 12 in the third to fourth periods in a plant, which comprises 5-aminolevulinic acid or a derivative thereof represented by the following general formula (1), or a salt thereof as an active ingredient: R2R1NCH2COCH2CH2COR3??(1) wherein R1 and R2 each independently represents a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group, or an aralkyl group; R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group, or an amino group, and is used for performing a treatment with 0.