Effects of Different Nitrogen Regulation on Maize Yield,Economic Benefit and the Content of Soil Nitrate-N

In order to increase the crop production and reduce the environment pollution by N fertilizer,a field experiment was conducted to study the effects of different nitrogen regulation on maize yield,nitrogen utilization,accumulation of NO3——N in soil and economic benefit.The results showed that optimized fertilization(OPT) and controlled-released fertilizer(CRF1and CRF2) could increase maize yield through improving the yield components,compared with farmer practice(FP).Furthermore,the application of the three measures mentioned above could enhance the utilization efficiency and agronomic efficiency of nitrogen fertilizer,significantly reduce the remains of NO3——N in 0-120 cm soil layer.The economic efficiency analysis indicated that the two measures of OPT and CRF2 could increase income by 1475.42 and 1102.28 Yuan hm-2 respectively,compared with FP.Taking economic benefit and ecological benefit into account,the optimized fertilization which reduced by 30% amount of nitrogen fertilizer and controlled-released fertilizer which reduced by 53% amount of nitrogen fertilizer could be more reasonable than farmer practice,and worth to be recommended.