在3个施氮水平下，研究不同施氮量及氮肥运筹对陇春33号产量及氮肥利用率的影响。结果表明，施氮量在0～270 kg/hm2范围内，陇春33号籽粒产量随施氮量增大表现为先增加后下降低的趋势，当氮肥施用量为237.6 kg/hm2时产量达最高。在相同施氮水平下，随着氮肥后移量的增大，籽粒产量和氮肥利用率均表现为先增加后降低的趋势，合理的氮肥运筹中，基肥、拔节肥、孕穗肥质量比为60∶25∶15时产量和氮肥的利用效率均达最佳。综合研究结果，采用高中氮量(N 195 kg/hm2)，并在拔节期和孕穗期分2次追施(基追比60∶25∶15)可协调籽粒产量和氮肥利用率的关系，有利于实现春小麦陇春33号的高产高效。

The effects of different amounts of nitrogen application and nitrogen management on Yield and nitrogen use efficiency of Longchun 33 were studied under three levels of nitrogen application. The results showed that the grain yield of Longchun 33 increased first and then decreased with the increase of nitrogen application in the range of 0～270 kg/hm2， and reached the highest when the nitrogen application rate was 237.6 kg/hm2. At the same level of nitrogen application， grain yield and nitrogen use efficiency increased first and then decreased with the increase of nitrogen fertilizer transfer. In reasonable nitrogen fertilizer management， when the mass ratio of base fertilizer， jointing fertilizer， booting fertilizer was 60∶25∶15， the yield and nitrogen use efficiency were the best. The comprehensive research results showed that the relationship between grain yield and nitrogen use efficiency could be coordinated by applying high and middle nitrogen levels(N 195 kg/hm2) and two topdressing treatments (dressing ratio 60∶25∶15) at jointing and booting stages， which was beneficial to the high yield and high efficiency of spring wheat Longchun 33.

S512.1

甘肃省科技重大专项“抗逆高产小麦新品种选育及高效生产技术集成展示”(1203NKDF018)。