小麦秸杆和残茬覆盖对夏玉米耗水量及产量的影响

夏玉米田进行小麦秸杆和残茬覆盖，可发迹夏玉米耗水规律，减少前期棵间蒸发，增加后期植株蒸腾，促进干物质积毗，使玉米产量和水分利用效率均有明显提高。不同土壤水分利用效率均有明显提高。不同土壤水分状况下，秸杆和残茬覆盖的效果是不同的，产量和水分利用效率以土训湿度较小的地段增加最为明显。说明该技术适用于气候比较干旱的地区，对发展我国北方旱地农业有重要意义。

Effects of Straw Mulching and Residue on Water Consumption and Yields of Summer Corn

Straw mulching and residue practices have great influence on growth and water consumption of summer corn.It can reduce soil water evaporation in early stages and increase crop transpiration in late stages.These are benefits to dry matter accumulation and yield increasing and water use efficiency of corn.The effects of straw mulching and residue are different under different soil water conditions.The increasing of yield and water use efficiency reduce with increasing of soil water content.It demonstrates that straw mulching and residue practices are applicable in arid and semi arid regions.It is significant for developing dry land farming in North China.