高产高蛋白大豆与高效固氮根瘤菌和菌根菌最佳联合共生体筛选

大豆——根瘤菌——菌根真菌联合共生对大豆生产具有重要意义,接种根瘤菌能扩大氮肥来源、接种菌根真菌有助于作物从土壤中吸取更多的磷素,应用这两项生物技术可改善大豆氮磷营养、提高土壤肥料利用率,是作物走向自身从空中取氮,向土壤索磷的新方向。 土壤中存在着大量的土著根瘤菌和菌根真菌,要选择高效根瘤菌和菌根菌与之共生,

STUDIES ON SELECTION OF THE BEST SYMBIOTIC SYSTEM OF HIGH YIELDING AND HIGH PROTEIN CONTENT SOYBEAN, HIGH EFFICIENT N FIXATION RHIZEBIUM AND MYCORRHIZA FUNGUS

In order to get a best symbiotic system of soybean, rhizobiam and mycorrhiza fungus, the four years experiments were conducted: 18 high yielding and high protein content summer-sown soybean varieties suitable to grow in the area of Yellow River and Huaihe River were selected to inoculate with 8 high efficient rhizobium strains respectively. From combinations above, the best one for symbiosis was selected as the material to make the best symbiotic system of soybean, rhizobium and mycorrhiza fungus by inoculation with mycorrhiza fungi. The best symbiotic systems selected were confirmed through the preliminary scanning in pot experiments and the field identification on symbiosis.The results indicated that rhizobium 113-2 and 2048 were better than others tested in broad -spectium affinity and high symbiotic N fication. Various soybean varieties showed a different adaptability to rhizobia . Approximately the same adaptability was found among the similar geno-typs. The improvements of biological yield, grain yield and protein content could be by the inoculation with rhizobia , whiie that of P absorption and P content in soybean plant with mycorrhiza fungi. The benefit would be much better when both of them were inoculated at the same time. The best symbiotic systems "Soybean Ludou 2- rhizobium 2948- mycorrhiza fungus G. epigacum " and "Soybean Zhongdou 14 - Rhizobium 61A76 - mycorrhiza fungus G. mosseac" were selected as the suitble to grow in Juye, Shangdong Province and Zhumadian, Henan Province re-sectively. Both system were beneficial to high yield, high protein content, high N fixation efficiency and strong P decomposition. For instance, the application of the second system was able to increase 20% of N fixed symbioticly,17. 8% of soybean yield and 33. 8% of protein yield respectively in the field symbiotic experiments.