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在农业生产实践中,我国劳动人民早就知道,用肥沃土壤搬到贫瘠的田里;用栽植过豆科植物的土壤,施加到新种植同样豆科植物的田里;这些验经证明:是有增产的效果,由于当时历史条件的限制,科学落后,尚无法阐明这种“客土法”的作用。 显然,就现在的土壤微生物知识看来,前者是接种土壤微生物,加强土壤微生物的活动,后者是接种根瘤菌。 从十九世纪中叶,国外研究者便开始在这方面做了研究,从根瘤菌、固氮菌的发现,一直到说明它们的作用,都获得一定的成就,但是,将成果应用到生产实践中去,还处在彷徨途中,苦无一条有成效的途径。
In the practice of agricultural production, the working people in our country have long been known to move the fertile soil to barren fields, and apply the soil planted with leguminous plants to the newly planted fields of the same legumes. These tests prove that: There is an effect of increasing production. Due to the limitation of historical conditions at that time and the backwardness of science, it is impossible to elucidate the role of such a law as the “guest-territory law.” Obviously, the current knowledge of soil microorganisms seems that the former is inoculated with soil microorganisms to enhance the activity of soil microorganisms, the latter is inoculated with Rhizobium. From the middle of the nineteenth century, foreign researchers began to do research in this field. From the discovery of rhizobia and azotobacter till the elucidation of their functions, some achievements have been made. However, the results have been applied to the production practice , Is still on the way, there is no effective way.