In spite of high yielding ability of Birsa Soybean-1 for the plateau re-gion of Bihar, it has not become popular among the farmers because of its black seed-coat color. The seeds of Birsa Soybean-1 were irradiated with different doses of gamma rays at FCI Sindri, Bihar (India) in 1979. Proge-nies of a yellow-seeded 50 Kr. M-2 plant in M-3 gave very promising and inter-esting plant types (Prakash et al., 1984)
