黑龙江省农田生态系统氮磷钾盈亏平衡的研究

THE STUDIES OF SURPLUS AND DEFICIT AND EQUILIBRIUM ON NITROGEN AND PHOSPHORUS AND POTASSIUM NUTRIENTS OF AGRO-ECOSYSTEM IN HEILONGJIANG PROVINCE

我省农田生态系统除友谊农场外，氮、钾严重亏损，氮归还率为１１％～８０％，钾的归还率为２５％～７５％，磷除安达、庆安外普遍归还过高，高者达３１１．１４％（甘南）、２１４．１１％（友谊），呈严重浪费状态．

Except Youyi farm,Nitrogen and potassium nutrient in agroccosystem are lossing heavily.The return ratio of nitrogen is 11%￣80%,that of potassium is 25%￣75%.The return ratio of phosphorus is very high except Qingan and Anda.The highest return ratio is 311.14%(Ganna),the higher is 214.11%(Youyi),existting heavily waste.