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利用栽培大豆（Ｇ．ｍａｘ）与半野生大豆（Ｇ．ｇｒａｃｉｌｉｓ）诱变的中间材料进行种间杂交，经过Ｆ４代系谱选择，育成了主茎粗、分枝数和生物量等性状具有明显优势，根系发达，根瘤固氮力强的新型旱地豆科绿肥作物新品种——科杂１号。该品种覆盖期长（２００ｄ左右），覆盖厚度３５ｃｍ以上，半蔓化匍伏生长，不缠绕树体。盛花至结荚期每公顷鲜草量３７５０１～５２５８０ｋｇ，是目前幼龄果园覆盖、培肥、抑制杂草、保持水土、改善果园生态环境、促进果树业可持续发展的较理想豆科绿肥作物
Interspecific cross between G. max and G. gracilis mutagens was used for interspecific hybridization. After the F4 generation pedigree selection, the main stem diameter, branch number, biomass and other traits had obvious advantages , A well-developed root system of nitrogen-fixing strong new legumes of green manure crop varieties - Branch Complex No. 1. The species covered a long period (about 200d), covering more than 35cm in thickness, semi-creeping creeping growth, not winding tree. Shenghua to podding period of 37501 ~ 52580kg per hectare of fresh grass is the current young orchard covering, fertilizing, weed control, soil and water conservation, orchards to improve the ecological environment, and promote the sustainable development of the fruit industry more ideal legume green manure crops