【摘要】 栽培大豆杂交，其Ｆ２代的结瘤指数、单瘤重和植株全氮（％）都有超亲现象，其综合等级指数则只有杂交优势，杂交后代固氮遗传力较低，受环境影响稍大。更多还原

【Abstract】 Soybean (G. max) hybrizing, their part of F2 hybrids exhibit over parents in nodulation index, single nodule weight and plant N (%), but the composite grade index of F2 generation only has heterosis. Nitrogen-fixation heritability of crossing hybrids is low, and mainly influenced by the environment.更多还原