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坡耕地１２年长期施肥结果表明：产量对长期施肥反映明显，施氮肥效果不显著，施磷肥效果较好，ＮＰ配合效果更佳，有机肥与Ｎ或ＮＰ配施，可大幅度提高产量。在长期施肥水平较低情况下，随着施肥时间的延长，轮作周期内产量、作物吸Ｎ、Ｐ量均呈递减趋势，可用ｙ＝α＋ｂｌｏｇｔ方程拟合，其参数ｂ均为负值，ｂ值的大小，反映出不同肥料对土壤肥力衰减程度。施Ｎ处理作物吸Ｎ量与吸Ｐ量相当，说明土壤中缺Ｐ素，严重限制了作物对磷的吸收。表明在Ｐ素极缺的黄绵土上，增施磷肥的重要性．
The 12-year long-term fertilization results of slope farmland showed that the yield reflected the long-term fertilization obviously, the effect of nitrogen fertilizer was not significant, the effect of applying phosphate fertilizer was better, the effect of NP was better. Combined application of organic manure and N or NP could greatly increase the yield. Under long-term fertilization, with the extension of fertilization time, the N and P contents of crop yield and crop suction in the crop rotation cycle showed a decreasing trend, which could be fitted by the equation of y = α + The size reflects the degree of attenuation of soil fertility by different fertilizers. Application of N treatment N uptake of plants and amount of absorption of P equivalent, indicating the lack of P in the soil, severely limited the crop phosphorus uptake. The results showed that the importance of phosphate fertilizer was increased on the loessial soil with extremely deficient P content.