氮素化肥施用量的不断增加,其吸收利用效果引起了人们的普遍关注.本文通过三年稻麦轮作中化肥氮残留效应的大田试验,对稻—麦—稻及麦—稻—麦两种轮作周期中残留氮的吸收、利用、经济效益及其对土壤氮的增补作用进行评价. The increasing application of nitrogenous fertilizer and its absorption and utilization effect aroused people’s widespread concern.In this paper, three years of rice and wheat rotation in the residual effect of nitrogen fertilizer in field trials, rice - wheat - rice and wheat - rice - wheat two The residual nitrogen absorption, utilization, economic benefit and its supplementary effect on soil nitrogen during the rotation cycle were evaluated.