一、选育经过铁丰18号(原组合号:铁6405)大豆品种是我所于1964年以45——15品种为母本,5621—1—6—2—4为父本进行有性杂交,并于F_1代风干种子用钴60γ射线照射选育而成。1971——1673年参加全省大豆品种区域试验,1974年3月经辽宁省农作物品种审定委员会审定命名推广。二、增产效果 1968—1972年在所内试验结果,平均亩产314.4斤,比对照品种铁丰3号增产20.1%,比当时新引进的群选1号品种增产25.7%; First, the breeding After Tiefeng 18 (the original combination number: iron 6405) soybean varieties in 1964 to my 45--15 varieties as the female parent, 5621-1-6-2-4 for the male sex Hybrid, and F_1 on behalf of dried seeds with cobalt 60γ ray irradiation from breeding. 1971 - In 1673 to participate in the province of soybean varieties regional trials, in March 1974 by the Liaoning Provincial Crop Variety Approval Committee named after the promotion. Second, the effect of increased production 1968-1972 within the test results, an average of 314.4 kg per mu, compared with the control varieties Tiefeng 3 20.1% increase, than the introduction of the newly elected group 1 varieties increased 25.7%;