以当地8个主推夏玉米高产品种为材料,分别在施氮与不施氮两个水平下进行氮利用效率和丰产性综合比较。结果表明,在两个施氮水平下,不同基因型玉米品种间的产量、氮累积量、耐低氮指数和氮利用效率存在显著差异。登海605和金海604在施氮和不施氮水平下均能保证高产,耐低氮指数较高,氮响应度较低,即耐低氮能力强,可作为低氮丰产高效玉米品种在当地应用推广。 Eight high-yielding summer maize varieties were selected as the materials, and the nitrogen use efficiency and high yield were compared under nitrogen and nitrogen application rates. The results showed that there was a significant difference in yield, nitrogen accumulation, low nitrogen tolerance index and nitrogen use efficiency of different genotype maize varieties under the two nitrogen levels. Denghai 605 and Jinhai 604 could ensure high yield, low nitrogen tolerance index and low nitrogen responsiveness under nitrogen and non-nitrogen application levels, that is, they had low nitrogen tolerance and could be used as low-nitrogen and high-yield and high-efficiency maize varieties in the local Application promotion.