<；P>；PROBLEM TO BE SOLVED: To provide a growth accelerator capable of providing "significant" income-increasing effects of C3 plant and C4 plant and its adjusting method, and also to provide usage of the growth accelerator for C4 plant. <；P>；SOLUTION: The foliar spray type growth accelerator is composed by dissolving a predetermined amount of a water-soluble cellulose alkylether in a pH buffer solution of a magnesium salt of a fermented liquid of "water-soluble protein and sugar" as a mother liquor. Furthermore, its optimum use time by a foliar spray is determined by considering flower bud differentiation of C4 plant sweet corn. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
