1. A method for the promotion of plant growth, which comprises treating the plants a compound represented by the following Formula (1): [in kotoroyW denotes -OR, -ON = CRR, -SRili -NRR, is hydrogen atom, halogen atom, nitro group, C1-C6 alkyl group which may have one or more groups selected from the group X, C2-C6 alkenyl group which may have one or more groups selected from the group X, C2-C6 alkynyl group which may have one or more groups selected from group X, a phenyl group which may have one or more groups selected s of the group Y, a 6-membered aromatic heterocyclic group which may have one or more groups selected from the group of Y, a 5-membered aromatic heterocyclic group which may have one or more groups selected from the group Y, a carboxyl group, C2- C6 alkylcarbonyl group which may have one or more halogen atoms, a benzoyl group which may have one or more groups selected from the group Y, C2-C6 alkoxycarbonyl group, aminocarbonyl group, -NRR, -S (O) NRR, -OR , -S (O) R or -SF, is hydrogen atom, a gal gene, cyano, nitro, C1-C6 alkyl group which may have one or more groups selected from the group X, C2-C6 alkenyl group which may have one or more groups selected from the group X, C2-C6 alkynyl group, which may have one or more groups selected from the group X, a phenyl group which may have one or more groups selected from the group Y, a 6-membered aromatic heterocyclic group which may have one or more groups selected from the group Y, 5 membered aromatic heterocyclic group which m ozhet have one or more groups selected from the group Y, a carboxyl group, C2-C6
