采用X、钴~(60)-γ射线照射大豆干种子能引起后代生育期、含油量、丰产性、抗倒伏性等的变异。生育期的变异一般以M_2生育期的变异起主导作用,在M_2发生成熟期变异后,有传递给后代的性能。从钴~(60)-γ射线5,000伦琴照射东农4号中选出比对照早熟25天的极早熟类型。用X、γ射线照射大豆干种子能诱发后代子实内粗脂肪含量的变异,通过选择能选出含油量高的品种,如从X射线照射满仓金的后代中选出黑农6号,四年平均粗脂肪含量为23.25％,比对照满仓金的粗脂肪含量四年平均为22.25％提高1％。X、γ射线照射大豆种子对后代的产量及抗倒伏性均有影响,通过选择能选出抗倒伏及丰产的大豆品种,并能分离出新的变异类 X, cobalt ~ (60) -γ-ray irradiation of soybean stem seeds can cause offspring growth period, oil content, high yield, lodging resistance variation. The variation of growth period usually takes the leading role in the variation of M 2 growth period, and there is the ability to pass on to the offspring after M 2 mutation occurs in mature period. From the cobalt ~ (60) -γ ray 5,000 Roentgen irradiated Dongnong 4, the type of the very early maturity 25 days earlier than the control was selected. Irradiation of soybean dry seeds with X and γ rays can induce the variations of crude fat content in the progeny of the offspring. Eleven varieties with high oil content can be selected by selection. For example, Heinong 6, The average annual crude fat content of 23.25%, compared with the control of full-term crude fat content of four years, an average of 22.25% increase of 1%. X, γ-ray irradiation of soybean seeds have an impact on the yield and lodging resistance of offspring. By selecting the soybean varieties that can resist lodging and high yield, new varieties of variation can be isolated