麦田秸秆覆盖效应及增产作用

冬小麦田覆盖稻草能增加N、P，特别是有机质和速效钾含量，增加土壤孔隙度，降低土壤容重。稻草覆盖能保墒、调温和减缓土壤水分、温度波动，降低麦田杂草密度。由于麦田覆盖稻草的上述综合生态效应，使小麦籽粒产量增加13.5%～46.1%，公斤稻草增产小麦0.12～0.23kg。冬小麦稻草经济有效覆盖量为3000kg/hm²。

Effects of straw mulch in wheat field and its effects on yield increase

Results from field experiments showed that by rice straw mulch, contents of soil N,P,especially organic matter and available K are increased,and soil physical structure was improved with soil porosty inreased and soil volumetric weight reduced. Straw mulch has also the functions in reducing soil evaporation, regulating soil temperature and decreasing soil weed density. Thus the wheat yield was increased 13.5 to 46.1%,that is per Kg rice straw increasing wheat yield at 0.12 to 0.23 Kg.The optimal rice straw mulch quantity was 3000kg/hm².