田间试验条件下，研究生育期和蛋白质含量不同的６个夏大豆品种的施氮效应。结果表明：大豆施氮可以增加植株的氮素积累，增加单株的有效荚数和粒数，从而提高籽粒产量和改善品质。但不同品种对氮肥的反应和需氮量有较大差异，早熟和早中熟品种施氮效果优于中熟和中晚熟品种，高蛋白品种好于低蛋白品种。生产上应根据品种的特性合理施用氮肥。 Field experiments were conducted to study the effects of nitrogen application on 6 summer soybean cultivars with different growth stages and different protein contents. The results showed that nitrogen application increased the nitrogen accumulation of plants and increased the effective pods and grains per plant, thus improving grain yield and improving quality. However, the response of different cultivars to nitrogenous fertilizer was different from that of nitrogenous fertilizers. The effects of nitrogen application on early maturity and early middle maturity cultivars were better than middle maturity and middle maturity maturity cultivars, and the high protein cultivars were better than those on low protein cultivars. Production should be based on the characteristics of the rational use of nitrogen fertilizer.