豫豆4号系延津县农牧局1978年用钴60r 射线1.5万伦琴照射农家品种药黑豆,经1979～1982年连续选择育成。1983～1984年品比试验中比农家药黑豆平均增产51.6%,早熟15天,抗倒力提高2级。1985年参加河南省大豆品种区域试验,全省22个点平均亩产127.5公斤,较对照品种跃进5号减产0.6%,早熟2天。1986年参加河南省区试,与 Yudou No. 4 Department of Yanjin County Bureau of Agriculture and Animal Husbandry 1978 with cobalt 60r ray 1.5 million Roentgen farmhouse varieties of black beans, by 1979-1982 continuous selection bred. From 1983 to 1984, the ratio of peanut black bean yield increased by 51.6% on average, 15 days earlier, and the anti-dumping power increased by 2 levels. In 1985, Henan Province participated in the regional trial of soybean varieties, the province average 22 points per mu 127.5 kilograms, compared with the control varieties Yuejin 5 cut 0.6%, 2 days premature. In 1986 to participate in Henan Province test, and