浙北平原为麦稻稻或油稻稻三熟制高产地区，当前有机肥减少，土壤碳、钾缺乏，秸秆还田具有原料广、成本低、简便易行、肥效好等优点，起到增加和更新三熟制吨粮稻田土壤有机质、增加钾素营养和活化土壤磷的作用，同时增产效果明显 Northern Zhejiang Plain is a high-yielding region of rice or rice with three-cropping system. At present, the organic manure is reduced, the soil is deficient in carbon and potassium, the straw has the advantages of wide raw materials, low cost, simple and convenient operation and good fertilizer efficiency And to update the soil organic matter in the three-cropping tonnage rice paddy so as to increase the nutrition of potassium and activate the phosphorus in the soil, at the same time, the yield increase effect is obvious