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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。
The dynamic changes of farmland nutrient balance in Heilongjiang Province from 1949 to 1999 were studied. Pointed out that the balance of nitrogen has been a deficit, but into the 90’s, the reduction rate is fast, the current balance of payments close to the balance of nitrogen; phosphorus balance into the 90s began a surplus, the current balance of phosphorus has reached 40% of the balance; and potassium The prime balance has been a large proportion of deficit. The article chooses the change of soil nutrient level in 10 years and 18 years in two typical village farms, and confirms that the farmland nutrient balance determines the change direction of farmland nutrients. The paper also discusses the control measures of farmland nutrient balance surplus. Table 3, reference 4.