Effect of Straw-mulch during Wheat Stage on Soil Water Dynamic Changes and Yield of Summer Maize

Taking bare surface as CK, this paper discussed effect of straw-mulch during wheat stage on soil water dynamic changes and yield of summer maize. Results showed that mulched treatments had significant effect on increasing yield. Influenced by plenty of rainfall, effect of straw-mulch on saving water was not significant, however, straw-mulch was beneficial to the water use efficiency(WUE) of summer maize. Straw-mulch had significant effect on saving water of the surface soil(0～30 cm),especially in the front of growth period of summer maize. On deep soil layer(100～110 cm),the soil content of straw-mulch was lower than that of bare surface. Summer maize which may make best use of plenty of rainfall in summer had significant influence in increasing the use efficiency of rainfall if it was applied with straw-mulch.