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以特种玉米为指示作物的有机施肥,连续两年田间试验,结果表明:施肥后的土壤耕层氮、磷、钾养分盈亏幅度为1.9%~15.7%、2.6%~12.0%、-0.29%~0.13%,比单施化肥增加3.0~16.8、2.8~12.2、0.25~0.67个百分点;氮、磷、钾盈亏量与施肥投入量呈极显著正相关。参试的3种有机肥中,猪粪肥表现为土壤生态培肥效果比较好,施肥两年耕层土壤氮、磷、钾含量均有盈余,存量比例为0.17∶1.00∶0.04。
The results showed that the profitability of N, P and K fertilizers was 1.9% -15.7%, 2.6% -12.0%,-0.29% ~ 0.13%, which was 3.0 ~ 16.8,2.8 ~ 12.2,0.25 ~ 0.67% higher than that of chemical fertilizers alone. There was a significant positive correlation between the profit and loss of nitrogen, phosphorus and potassium and the amount of fertilization. Among the three kinds of organic fertilizers tested, pig manure showed better effect of soil ecological fertilization, and the content of nitrogen, phosphorus and potassium in the topsoil of two years of fertilization was surplus with the stock ratio of 0.17:1.00:0.04.