The nodulation and nitrogen fixation of 53 species belonging to 24 genera major cultivated or wild legumes are studied in Gansu-Ningxia region of the loess plateau.

• 甘肃省黄土高原区不同生态条件下栽培和野生豆科植物根瘤菌资源及共生固氮特性的调查结果表明,从112份24属53种根瘤样品中分离获得87株根瘤菌。