【摘要】 研究了黑龙江省１９４９～１９９９年农田养分平衡盈亏的动态变化。指出氮素平衡一直是亏缺 的，但进入９０年代，减亏速率很快，到目前氮素收支接近平衡；磷素平衡进入９０年代开始盈余，目 前磷素平衡盈余已达４０％；而钾素平衡一直呈大比例亏缺。文章选择了两个典型村农田实际测定 在１０年和１８年中土壤养分水平的变化，结果证实了农田养分平衡状况决定了农田养分的变化方 向。文章还讨论了农田养分平衡盈余的调控对策。表３，参４。更多还原

【Abstract】 In this paper the dynamic variation of the farmland nutrients balance and its profit and loss in Heilongjiang Province was studied from 1949 to 1999. The nitrogen in farmland was defi- deficient all along, however, the expenses and receipts of nutrient was close to balance in 90’s. The content of phosphorus were over applied after 90’s,it is over applied by 40 percent at present time. The potassium was deficient all along with high proportion. Two typical farmlands was selected to test the changes of soil nutrients in 10 years and 18 years,the result shows that the changes of farmland nutrients was determined by balance of farmland nutrients. How to control the balance of farmland nutrients was discussed also in this paper.更多还原