Study on Variation of Soil Moisture in Two Crops A Year Farmland of Winter Wheat and Summer Maize in Central-south of Hebei Province

To study the annual variation of 2 m soil water content and water storage of winter wheat and summer maize in central south Hebei areas one year two cropping system farmland,the soil moisture content changes of 2 m in the natural production conditions of rotation periods were analyzed. The results showed that 2 m soil total water storage changes in wheat season and maize season was different,wheat season belongs to the water consumption period( loss of 111. 8 mm),and maize season belonging to the water increasing period( surplus of 111. 8 mm),but the soil moisture rotation anniversary realized loss and profit balance. The soil water use was not sufficient by wheat,especially the deeper soil water using rate was very low,after wheat harvest 2 m soil still saved water397. 3 mm,where the effective available soil water was 90- 147 mm,the soil water content in 150- 200 cm layer was above 16%. Therefore,it should take the cultivation technology of drought stress in wheat season,making full use of deep soil moisture and improving the utilization rate of soil water.