目前人们都知道秸秆覆盖能减少土壤水分蒸发,增加降雨渗入量和土壤贮水量,从而提高小麦产量,提高降水生产效率。究竟用多少秸秆、在什么时间覆盖最为合适?我们进行了不同覆盖和覆盖量的选择试验。试验设计、处理见表1。随机排列,重复两次,小区面积35平方米。小麦品种、施肥量、密度及田间管理与大田水平相同。一、覆盖减少蒸发的效果在小麦苗期,当麦苗还不能覆盖地面时,土壤水分的损失主要通过蒸发和扩散进行,这时用秸秆覆盖能大大地减少蒸发损失。此时可用秸秆在小麦行间进行覆盖,即使不可避免的把少量秸秆盖到小麦行上,也因此 At present, people all know that straw mulching can reduce soil water evaporation, increase rainfall infiltration and soil water storage, thereby increasing wheat yield and increasing precipitation production efficiency. How much straw to use, at what time is the most appropriate coverage? We conducted a selection of different coverage and coverage tests. Experimental design, treatment in Table 1. Random arrangement, repeated twice, residential area of ​​35 square meters. Wheat varieties, fertilizer rates, densities and field management are the same as field levels. I. Coverage to Reduce Evaporation In wheat seedling, when wheat seedlings can not cover the ground, the loss of soil moisture is mainly caused by evaporation and diffusion. At this time, straw mulching can greatly reduce the evaporation loss. At this point straw can be used to cover the rows of wheat, even though it is inevitable to cover a small amount of straw on the lines of wheat, and therefore