Zhuangfengan and Aijiaohu were sprayed on a winter wheat cultivar Zimai 12 before winter to study their effects on controlling the vigorous growth and cultivating the strong seedlings,preventing the late frost damage and yield.The results showed that the effect of Aijiaohu on controlling the vigorous growth and cultivating the strong seedlings was significant,it could efficiently reduce the length and increase the width of the 5th and 6th leaves near the root,delay the differentiation process of young ear.Z...