Disclosed is a method for promoting the growth of a plant, comprising treating the plant with an effective amount of a compound represented by the following formula (1): wherein any one of R
1
, R
2
, R
3
and R
4
represents a trifluoromethyl group, the others represent a hydrogen atom, and R
5
represents a methyl group or an ethyl group.
                            本发明公开了一种促进植物生长的方法,包括使用下式(1)所表示的化合物的有效量处理植物,其中R1、R2、R3和R4中的任意一个代表三
氟甲基基团,其余代表氢原子,而R5代表甲基基团或乙基基团。