苏南地区农田养分循环特征及平衡调控途径

Characters of nutrient cycles and ways for regulating their balance in south Jiangsu Province.

从宏观计算和田间模拟试验两方面分析了江苏南部农田养分循环和平衡特征的变化趋势,农田养分投入结构由有机养分为主转向以无机养分为主,农田养分内循环变弱,农田养分平衡N素由亏损转为过剩,P由亏损转为持衡,但K素亏缺愈加严重。指出增加P、K肥投入,适当控制N肥投入,在机械化条件下增加有机肥的投入是合理调控该地区农田养分平衡的重要途径。

The dynamics of farmland nutrient cycles and balance in the southern part of Jiangsu Province were analysed based on macro-calculation and field tests. The results show that the main nutrient input is changing from organic fertilizer to inorganic fertilizer; farmland internal cycling is being weakened; N balance is changing from deficiency to surplus, P from deficiency to equilibrium, while K is becoming more and more deficient. So enhancing P and K input and limiting N input as well as increasing the return of organic matter to farmland by mechanization are important ways to regulate farmland nutrient balance in this region.