Analysis of the Relationship Between Drought and Yield of Winter Wheat and Maize

The atmosphere drought indexes were compared with the yields of winter wheat and maize in Qingyang, Gansu province. The results showed that the yield of winter wheat related most closely to the autumn drought of the year before. The drought occurred in spring, in the late spring and the beginning of summer, and in the summer of the year before had significantly influenced on the yields of winter wheat; The summer drought had the most remarkably influence on the yield of maize. The drought occurred in the autumn, in spring, and in the late spring and the beginning of summer had significantly influenced on the yields of maize.