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双季稻田水稻连续１０年不施肥，平均年亩产稻谷４５６ｋｇ，土壤有机质及全氮含量无明显变化。不配施磷、钾肥稻谷产量不稳定，平均每年土壤速效磷（Ｐ）下降０．３４～０．４８ｍｇ／ｋｇ，速效钾（Ｋ）下降０．９～１．６ｍｇ／ｋｇ。配施氮磷钾化肥平均年亩产稻谷７００ｋｇ，土壤有机质无明显变化，全氮含量增加０．１６ｇ／ｋｇ，土壤磷素投入及产出基本平衡，土壤速效磷及全磷含量无明显变化。氮磷钾与猪粪配施平均年亩产稻谷８０３ｋｇ，土壤肥力有明显提高。
Double rice paddy rice for 10 consecutive years without fertilization, the average annual output of 456kg per mu, soil organic matter and total nitrogen content no significant change. Without phosphorus, the yield of potash paddy was unstable. The average annual available phosphorus (P) decreased 0.34 ~ 0.48mg / kg and the available potassium (K) decreased 0.9 ~ 1.6mg / kg. With an average annual yield of 700kg of paddy with NPK fertilizers, there was no significant change in soil organic matter, total nitrogen content increased 0.16g / kg, phosphorus input and output of soil basically balanced, soil available phosphorus and total phosphorus content did not change significantly. Nitrogen, phosphorus and potassium and pig manure with an average annual output of 803 kg per mu of rice, soil fertility has improved significantly.