Study on Variation of Wheat Field Soil Moisture in Central-south of Hebei Province

In the middle south of Hebei Province during the growing season of winter wheat,the annual variation of 2 m soil water storage in wheatfield were analyzed. The results showed that 2 m soil total water storage from wheat sowing to harvest was significantly decreased,at wheat harvest stage 2 m soil total water storage reduction of about 134. 6 mm. The soil water content of each layer was decreased,the soil water content in the layer of 0- 40 cm soil had the largest decline,which below 150 cm layer with minimum water fall. The changes of soil water content gradually reduced with the increase of soil depth,the soil water below 150 cm layer was used less by wheat.