Abstract: The Seeds of two winter wheat varieties were treated by humic acid. The changes of morphological and physiological characters of winter wheat were studied. The results showed that humic acid could raise the rate of seedling and significantly improve the growth and accumulation of the biomass of winter wheat. The ABA content in the winter wheat leaves during over-wintering period, the vitality of root systems and the yield of winter wheat had improved by the humic acid treatment.

Key words: Humic acid, Humic acid, Winter wheat, Physiology, Experiment research