【摘要】 ２６株快生型大豆根瘤菌（Ｒ．ｆｒｅｄｉｉ）与我国２５个栽培大豆品种共生试验表明：Ｒｆｒｅｄｉｉ能与我国栽培大豆有效共生，固氮酶活性（Ｃ２Ｈ４）一般在３～６ｎｍｏｌ．Ｌ（－１）．ｇ（－１）．ｈ（－１），接种在跃进５号、山宁２号、鲁豆４号、民权圆蛋粒和上海早毛豆等品种上共生效果与慢生型大豆根瘤菌Ｂ．ｊａｐｏｎｉｃｕｍ１５００６（Ｐ．Ｒ．Ｃ．００５）相当或超过之。但Ｒ．ｆｒｅｄｉｉ对大豆品种的选择性更明显，２６个菌株的接种有效率平均为４９％，其中１５０６７（ＵＳＤＡ１９１）为８９％。４株Ｒ．ｆｒｅｄｉｉ接种在夏大豆跃进５号、鲁豆４号和山宁２号上的田间小区实验每亩增产大豆１０．６～３２．１ｋｇ，增产幅度９．４％～３１．４％。大田接种平均每亩增产大豆２２．１ｋｇ。更多还原

【Abstract】 Symbiotic combination experiments have been conducted with 26 strains of R. fredii and 25 soybean cultivars. Symbiotic association of R. fredii and soybean cultivars in China performed effectively. the nitrogenase activity is usually 3～6nmol.L(-1).g(-1).h(-1)(C2H2).The nitrogen fixation ability of R. fredii to soybean Cultivars, Yuejin-5,Shanning-2,Ludou-4,Ludou-4,Minquan round bean, Shanghai early bean is similar or superior to that of B. japonicum 15006. Compatibility of R. fredii towards soybean cultivars is more strict than that of B. japonicum. Average nodulation rate 26 strains against 203 soybean cultivars is 49%,among which strain 15067(USDA 191) gives 89% in nodulation. Summer soybean cultivars, Yuejin 5,Ludou 4 and Shanning 2 were inoculated with 4 strains of R. fredii. The yield increase were 10.6～32.1kg per mu in Plot experiments and 22.1kg in average in fields. The seed production was increased by 9.4%～31.4%.更多还原