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.%通过田间小区试验,研究了氮素运筹对玉米干物质积累、氮素吸收分配及产量的影响.结果表明,施氮和有机肥可以延长干物质积累的旺盛时期,使玉米干物质总量积累速率最大的时刻推后1~3 d,增加了玉米的干物质积累量.氮肥配施有机肥能延长氮素积累的旺盛时期,其中,施氮225 kg/hm2+有机肥30t/hm2(N2+M)处理氮素积累的旺盛时期Δt分别比不施氮(NO)、施氮112.5 kg/hm2(N1)、施氮225 kg/hm2(N2)、施氮281.25 kg/hm2(N3)和施氮307.5 kg/hm2(FP)处理延长了6、4、6、1和7 d,该时段吸氮量比FP处理增加0.25g/plant,比等氮量的N2处理增加0.24g/plant.播前施有机肥30t/hm2,在减N26.83%的情况下,玉米吸氮量比常规施肥(FP)提高6.52%,氮素利用率达54.31%,高于常规施肥的33.27%;玉米增产24.12%,比常规施肥增收2696元/hm2.
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