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随着农业生产的发展,土地复种指数不断增加,特别是种植两季稻后,迫切需要开辟肥料来源。大力发展紫云英绿肥,既是解决当前肥料不足的好办法,又是改良土壤、提高土壤肥力、促进粮棉作物稳产高产的一条重要途径。但是,我省种植紫云英的新区,土壤中普遍缺乏紫云英根瘤菌,必须进行人工接种,才能保证紫云英正常生长从而获得高产。为此,我们在1972年3月起着手进行紫云英根瘤菌的分离工作,在室内进行菌株的筛选,秋季在成都、乐至、夹江、重庆、南充等地进行了田间试验,结果如下:
With the development of agricultural production, the index of land mothballing has been continuously increasing. Especially after planting two-season rice, there is an urgent need to open up fertilizer sources. Vigorously develop Ziyunying green manure is not only a good way to solve the current shortage of fertilizers, but also an important way to improve the soil, improve soil fertility and promote stable and high yield of grain and cotton crops. However, the province planted a new area of Astragalus, the soil generally lack of Rhizobium japonicum, must be inoculated in order to ensure the normal growth of Astragalus to obtain high yield. To this end, we began to carry out the separation of Rhizobium japonicum in March 1972 and carried out in-house screening of strains. In the field trials in Chengdu, Lezhi, Jiajiang, Chongqing and Nanchong in the fall, the results were as follows :