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为实现因不同夏玉米品种科学施用氮肥,采用田间试验研究了不同施氮量对郑单958、浚单20、农华101和先玉335产量、经济效益、氮素积累及氮肥效率的影响。结果表明,4个夏玉米品种施氮增产显著,郑单958在低氮时产量和纯收益较好,增产18.19%,增收3 158元/hm2;浚单20、农华101和先玉335在高氮时产量和纯收益较好,分别增产17.31%、25.03%和17.41%,增收2642、3726和3182元/hm2。施氮量增加,郑单958氮肥农学效率显著降低,浚单20、农华101和先玉335氮肥农学效率无显著差异。生产中郑单958适宜低氮肥用量,而浚单20、农华101和先玉335适当增加氮肥用量可获得较好收益。
In order to achieve the scientific application of nitrogen fertilizer to different summer maize varieties, field experiments were conducted to study the effects of different nitrogen application rates on yields, economic benefits, nitrogen accumulation and nitrogen fertilizer efficiency of Zhengdan 958, Xundan 20, Nonghua 101 and Xiangyu 335. The results showed that four summer maize varieties had a significant increase in nitrogen application yield. Zhengdan 958 had a good yield and net yield at a low nitrogen rate of 18.19%, an increase of 3 158 yuan / hm2; Xundan 20, Nonghua 101 and Xiangyu 335 High nitrogen production and net income is better, respectively, an increase of 17.31%, 25.03% and 17.41%, an increase of 2642,3726 and 3182 yuan / hm2. Nitrogen content increased, Zhengdan 958 nitrogen fertilizer agronomic efficiency significantly reduced, Xundan 20, Nong Hua 101 and Xian Yu 335 nitrogen agronomic efficiency no significant difference. Zhengdan 958 suitable for low nitrogen fertilizer production, and Xundan 20, Nong Hua 101 and the first jade 335 appropriate increase in the amount of nitrogen fertilizer can get better returns.