根瘤是豆科植物根与根瘤细菌的共生固氮组织,它的好坏与多少,同豆科绿肥肥效及豆作产量有密切关系。改革耕作制度,发展间作套种,为关中灌区间套夏季豆科绿肥提供了良好条件。武功县杨陵公社陈小寨大队,1976年套种了黑豆、柽麻、小豆等豆科绿肥作物,77年又套种绿豆、草木栖、田菁、柽麻、黑豆、大豆、小豆等五百余亩,占秋粮面积30％以上,同时布设了一些试验处理。结合这一有利条件,再次(1974年在宝鸡县西秦大队做过夏季豆科绿肥根瘤第一次 Nodules are the symbiotic nitrogen fixation of leguminous roots and root nodules, and their quality and quantity are closely related to the efficiency of legume green manures and the yield of beans. Reform farming system, the intercropping intercropping, intercropping Guanzhong intercropping summer legume green manure provided a good condition. Chen Xiaozhai Brigade Yangling Commune of Wugong County, 1976, intercropping black legumes, flaxseed, adzuki bean and other legumes green manure crops, 77 years and intercropping mung bean, Habitat, Sesbania, Abutilon, black beans, soybeans, adzuki bean and more than 500 acres , Accounting for more than 30% of autumn grain area, while laying some experimental treatment. Combined with this favorable conditions, once again (in 1974, Baoji County, West Qin Brigade had done legume green fertilizer nodules the first time