以4个不同氮效率玉米品种为试验材料,对其吐丝前后氮累积量和氮转移的基因型差异进行分析。结果表明,吉单209耐低氮能力较强;四密25对增施氮肥反应敏感,增施氮肥后增产幅度较大,表现出明显的喜氮特性。吐丝之后氮累积量较少的基因型,其相应的产量也较低。高产品种的选育应侧重花后氮素吸收,同时对于现有高产品种也应侧重花期氮肥的追施。 Four different nitrogen efficiency maize cultivars were used as experimental materials to analyze the differences of nitrogen accumulation and nitrogen transfer before and after spinning. The results showed that Jidan 209 had a strong ability of tolerating low nitrogen and the four sensitive 25 nitrogen fertilizers were sensitive to increasing nitrogen fertilizer. Genotypes with less nitrogen accumulation after silking also had lower yields. Breeding of high-yielding varieties should focus on post-anthesis nitrogen absorption, and at the same time, emphasis should be placed on topdressing nitrogenous fertilizer for the current high-yielding varieties.