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牡丰6号大豆是黑龙江省农科院牡丹江农科所1981年以铁岭短叶柄为母本,美国克拉克63为父本杂交F_2代,经CO~(60)—γ射线16千伦辐照干种子诱发出的早熟突变体,经多年选育而成。该品种蛋白质含量高,高抗大豆灰斑病,且粒大、产量高,适于出口。1989年出口日本50万公斤,1990年议向出口300万公斤,是个很有发展前途的高蛋白大豆新品种。一、生育特性牡丰6号植株为无限结荚习性,紫花、圆叶,株高86.4～139.1厘米,主茎16.2个节,百粒重21.1～23.38克,,籽粒黄色,扁圆形,淡褐脐,属于大粒型种。植株为分枝型,具有繁茂、抗倒、抗旱、耐瘠、耐肥水的特点。生育期119～122天,属中熟偏晚类型种。正常年5月上旬播种,9月21～29日成熟。活动积温2452.7℃。
Mufeng No. 6 soybean was produced in 1981 by Mudanjiang Agricultural Institute of Heilongjiang Academy of Agricultural Sciences with short petiole of Tieling as female parent and American Clarke 63 as male parent of F_2 generation. Seed-induced early mutants, after years of breeding. The variety of high protein content, high resistance to soybean gray spot disease, and tablets large, high yield, suitable for export. It exported 500,000 kilograms of Japan in 1989 and 3,000,000 kilograms in 1990. It is a promising new high-protein soybean. First, fertility characteristics Mu Feng 6 plants unlimited pod habit, purple, round leaves, plant height 86.4 ~ 139.1 cm, the main stem 16.2 section, the weight of 21.1 to 23.38 grams, the grain yellow, oblate, light Brown navel, belonging to the big grain type. Plants are branched, with lush, anti-down, drought, barren, resistant to fertilizer characteristics. Growth period of 119 to 122 days, is a middle-late type of late type. Normal early May seeding, September 21 ~ 29 mature. Activity accumulated temperature 2452.7 ℃.