【摘要】 采用模拟水田基肥施用NH4 HCO3 的方法 ,研究了不同施肥—耕作方法对水田水层和土层滤液中NH+ 4—N浓度及分配量的影响。结果表明 :施肥—耕作方法对水层和土壤滤液中NH+ 4—N浓度及分配量有显著的影响。 3种施肥—耕作方法中 ,水层NH+ 4—N浓度及分配量为方法Ⅰ (灌水—施肥—耕作—沉清 ) <Ⅱ (灌水—耕作—施肥—沉清 ) <Ⅲ (灌水—耕作—沉清—施肥 ) ,土壤滤液中NH+ 4—N浓度及分配量为Ⅰ >Ⅱ >Ⅲ ;随着施肥量的增加 ,3种耕作法的水层、土层滤液中的NH+ 4—N浓度均有增加 ,水层中的增加量为方法Ⅰ <Ⅱ <Ⅲ ,土层滤液中增加量为Ⅰ >Ⅱ >Ⅲ。综合比较 ,方法Ⅰ对于减少水田中氮素损失 ,提高氮肥利用率 ,控制氮素污染具有较高的应用价值。更多还原

【Abstract】 The effects of methods of fertilizer application—cultivation on the concentration of NH + 4—N in the water and the soil filtrate of paddy field were studied by simulating application of NH 4HCO 3 as base fertilizer through three methods in rice field.Method 1 is irrigation→feitilizing→ploughing and raking→settling.Method 2 is irrigation→ploughing and raking→fertilizing→settling.Method 3 is irrigation→ploughing and raking→settling→fertilizing.The results indicated that there were significant effects of the methods on the concentration of NH + 4—N in the water and the soil filtrate of paddy field ,and that the concentration of of NH + 4—N in the water and the fieltrate in the three methods were raised with the increase of the fertilizer amount of application.The author think that Method 1 may be most valuable one for use in the three methods because it could reduce the loss of nitrogen,raise the utilization efficiency of nitrogen fertilizer and control the pollution of nitrogen.更多还原