The trials were carried out in field experiment and artificial climate incubator. The sugar beet growth buds were treated at 1-3 pairs of true leaves with gibberellin(GA3) ,autix(IAA), naphthaleneacetic acid (NAA ) and kinetin (KT), and the plant growth regulating substances enhancing bolting of sugar beet in the first year and its doses were selected out. The sugar beet seedling induced by temperature and light were treated by abscisic acid (ABA) , maleic hydrazide(MH), uniconazole (S-3307) and paclobutraz...