Abstract : results of a ten year ' s field experiment indicated that the use of nutrients recycled in the farming systems with appropriate amount of fertilizer applied according to the soil nutrient supplying ability could not only produce high crop yield but also balance the soil nutrient budget so that there were no significant surplus of nutrients ( mainly inorganic nitrogen ) which may emit or leach out of soil into environment 文摘:持续10a的田间试验结果表明，在保持农业系统养分循环再利用的基础上，根据土壤养分供给力设计化肥施用量，可以在实现作物高产的同时，平衡土壤养分收支，从而避免土壤中肥料养分（主要是氮）过剩而进入环境。
