Effects of nitrogen management on maize dry matter accumulation,nitrogen uptake and distribution and maize yield

The effects of nitrogen management on maize dry matter accumulation,nitrogen uptake and distribution and maize yield were studied through a plot field experiment.The result showed that application of nitrogen fertilizer and organic matter could prolong the vigorous time of dry matter accumulation,postpone the maximum accumulation rate by 1～3 d compared to the other treatments.Application of N combined with organic fertilizer could also delay the time of maximum N accumulation rate,prolong the vigorous period of N accumulation.The treatment of N2+M prolonged the vigorous period of N accumulation Δt by 6 d、4 d、6 d、1 d、7 d compared to N0、N1、N2、N3、FP treatments respectively,increased the nitrogen uptake by 0.25 g/plant compared to FP treatment,and by 0.24 g/plant compare to treatments with equal N rate.Using organic fertilizer 30 t/hm2 as base fertilizer,under the condition of N application rate reduced 26.83%,enhanced the N uptake by 6.52% compare to the local conventional fertilization.The nitrogen utilization efficiency was 54.31% which was 33.27% higher than that under conventional fertilization.It could also increase the maize yield by 24.12% and the income by 2696 yuan/ha compare to conventional fertilization.