坡地施用聚丙烯酰胺可以减少地表径流 ,提高土壤含水量 ,促进土壤沉降 ,增强土壤结构性和水稳性 ,因而提高了土壤的持水性和抗蚀性 ,减少了土壤侵蚀量和肥力流失量 ,有利于作物增产。施用聚丙烯酰胺可使产量增加 18.7%～ 32 .4 %。施用聚丙烯酰胺对环境无不良影响 ,而且投入费用较低 ,是一条值得探索的防治坡地水土流失的新途径 The application of polyacrylamide on sloping land can reduce surface runoff, increase soil water content, promote soil subsidence, enhance soil structure and water stability, thus improving soil water retention and corrosion resistance, reducing soil erosion and loss of fertility, Is conducive to crop production. Polyacrylamide can increase the yield by 18.7% ~ 32.4%. Application of polyacrylamide on the environment without adverse effects, and lower input costs, is worth exploring a new way to control soil and water loss in the sloping fields