通过玉米氮肥用量田间试验，探索不同氮肥用量对玉米产量、效益及养分吸收的影响。试验结果表明：不同地区对氮肥施用量的表现存在一定差异，朝阳地区玉米施氮增产10.2%~23.2%，增收173~2312元/hm2，经济合理施氮量为230 kg / hm2，昌图地区玉米施氮增产21.3%~53.2%，增收2539~6132元/ hm2，经济合理施氮量为245 kg / hm2；施氮可促进玉米对氮、磷、钾素的吸收，但随着施用量的增加，氮肥的利用率降低，在本实验条件下，朝阳地区氮肥的利用率为12.6%~35.2%，昌图地区的氮肥利用率为22.2%~44.6%。%Field experiments were conducted to study the effects of different application amount of nitrogen fer-tilizer on maize yield,benefit and nutrient absorption. The results show that N fertilization increased yield by 10. 2% ~ 23. 2% and profit by 173 ~ 2 312 yuan / hm2 compared with the treatment without nitrogen fertilizer, economic optimum N fertilizer rate was 230 kg / hm2 in Chaoyang ,whereas in Changtu ,N fertilization in-creased yield by 21. 3% ~ 53. 2% and profit by 2 539 ~ 6 132 yuan / hm 2 ,economic optimum N fertilizer rate was 245 kg / hm2 . N,P,K uptake rate was increased and N utilization efficiency was decrased with N applica-tion rate increasing,N utilization efficiency was 12. 6% ~ 35. 2% and 22. 2% ~ 44. 6% in Chaoyang and Changtu respectively. Reasonable application of nitrogen fertilizer was necessary to improve fertilizer utilization ratio.
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