有机肥对黑土耕层土壤养分的影响

Effect of Manure Application on Nutrients in the Top Layer of Balck Soil

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 two-year experiment results showed that the contents of nitrogen, phosphorus, potassium in treatments with manure application were higher than that of only fertilizers applied. The difference of N, P and K in treatments after applying manure was 1.9%-15.7%, 2.6%-12.0% and -0.29%-0.13% respectively, with the increase of 3.0% -16.8%,2.8%-12.2% and 0.25%-0.67% respectively. The proportion of them was 0.17：1.00：0.04.