为提高农业产量,苏联普遍施用化学肥料。但是,施化肥绝不能取代对增加土壤天然肥力问题的研究。土壤是生物与岩石相互复杂作用的最终产物。无机跑料的合理利用与对土壤中微生物过程定向性的了解程度有直接关系。根据最新资料,1公顷耕作层内微生物总重量达5～15吨。这充分说明生物因素对提高农业产量发挥巨大作用。因此,提高土壤天然肥力的问题应列为当代最重要 In order to increase agricultural output, chemical fertilizers are commonly used in the Soviet Union. However, fertilizers must never replace the study of increasing soil fertility. Soil is the end product of the complicated interaction between living things and rocks. The rational utilization of inorganic materials is directly related to the degree of understanding of the orientation of microbial processes in the soil. According to the latest information, the total microbial weight per hectare of cultivated layer reaches 5-15 tons. This fully shows that biological factors play a huge role in raising agricultural output. Therefore, the issue of increasing the natural fertility of soils should be listed as the most important of the present