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为明确黄淮海夏玉米适宜的施肥量和最佳收获时期,设计了5个氮肥水平(不施肥、113、181、249和375 kg N.hm-2)和2个收获时期(S1:9月23日,农民习惯收获时间;S2:9月29日,推迟6 d收获),研究施氮量和收获时期对夏玉米产量和品质的影响.结果表明:随施肥量增加,夏玉米穗粒数、千粒重和产量均增加,但差异不显著,其中施肥量在113～181 kg N.hm-2的玉米产量、氮素利用效率均相对较高;随施肥量增加,夏玉米蛋白质和赖氨酸含量增加,淀粉含量降低.与9月23日蜡熟期收获相比,9月29日完熟期收获的夏玉米籽粒千粒重、产量、淀粉和赖氨酸含量均增加,籽粒蛋白质和脂肪含量降低.依据产量水平,黄淮海高产夏玉米区适宜的施肥量在113～180 kg N.hm-2,最佳收获时期应推迟至9月29日—10月5日.
In order to clarify the suitable fertilization amount and the optimal harvest time of summer maize in Huang-Huai-Hai region, five nitrogen fertilizer levels (no fertilizer, 113, 181, 249 and 375 kg N · hm-2) and two harvest periods On the 23rd, farmers get used to harvesting; S2: September 29, postponed for 6 days) to study the effect of nitrogen application rate and harvest time on the yield and quality of summer maize.The results showed that with the increase of fertilizer application, , 1000-grain weight and yield increased, but the difference was insignificant. Among them, the yield and nitrogen use efficiency of 113-181 kg N · hm-2 were relatively high. With the increase of fertilizer application, the content of summer maize protein and lysine Content and starch content decreased.Compared with the harvest on September 23, the 1000-grain weight, yield, starch and lysine content, and protein and fat content of summer maize harvested at the end of September 29 were all decreased. According to the yield level, the suitable fertilization amount in the high-yielding summer maize region of Huanghuaihai ranged from 113 to 180 kg N · hm -2. The optimal harvesting period should be postponed from September 29 to October 5.