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以３种不同基因型大豆品种为试材，研究大豆根瘤形成始期（二片复叶Ｖ２）和大豆生殖生长期间施用氮肥，对大豆生长、结瘤及产量的影响。试验结果表明，大豆营养生长阶段的最佳追肥时间为根瘤形成始期；而大豆生殖生长期间的最佳追肥时间为大豆开花期。
Three soybean cultivars with different genotypes were used as experimental materials to study the effects of nitrogen fertilizer on the growth, nodulation and yield of soybean during the initial stage of nodule formation (two-leaf compound V2) and soybean during reproductive growth. The results showed that the best top-dressing time of soybean during vegetative growth stage was nodule formation, and the best top-dressing time during soybean reproductive growth was soybean flowering stage.