Effects of Different Nitrogen Application Rates on the Yield and Nitrogen Use Efficiency of Maize
Using no nitrogen fertilizer as control(CK),the change characteristics of maize yield and nitrogen use efficiency were studied at four nitrogen application levels.The results showed that the application of nitrogen fertilizer could significantly increase the dry matter accumulation yield of maize,and the number of grains per ear,thousand grains mass and yield showed a gradual in-crease trend with the increase of nitrogen fertilizer dosage.However,with the increase of nitrogen application rate,nitrogen partial productivity,nitrogen agronomic utilization rate,nitrogen physiological utilization rate and nitrogen apparent utilization rate de-creased.These results indicated that with the increase of N fertilizer rate,N use efficiency decreased,but yield and grain nitrogen ac-cumulation increased,and the yield benefit was better when N application rate was 90 kg/hm2,which was more suitable for local N application rate.
万方数据
维普
