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土壤中氮素肥分,经大气水和地下水的冲刷作用及有机态氮随着收获物被带走,都必然要引起土壤中含氮总量的减少;据叶和才和陈华葵报告(1945),我国94％以上水田都亏缺氮素,一般含氮量只有0.05—0.08％。这往往成为农作物产量和品质提高的“限制因素”,因此增加和平衡土壤氮素问题是当前农业生产重要的问题之一。 增加和平衡土壤的氮素,可以靠施用有机和无机含氮肥料,但也可以通过生物固氮作用的途径来解决。 生物固氮作用目前主要是扩种各种豆科植物,借
Nitrogen fertilizer in the soil, the scouring effect of atmospheric water and groundwater and the removal of organic nitrogen with the harvested material will inevitably lead to the reduction of total nitrogen in the soil. According to Ye Hecai and Chen Hua Kui (1945) , More than 94% paddy fields in China are deficient in nitrogen, and the nitrogen content in general is only 0.05-0.08%. This often becomes a “limiting factor” in crop yield and quality improvement. Therefore, increasing and balancing soil nitrogen is one of the most important issues in agricultural production. Increasing and equilibrating soil nitrogen, which can be applied by applying organic and inorganic nitrogenous fertilizers, can also be addressed by means of biological nitrogen fixation. Biological nitrogen fixation is currently the main expansion of all kinds of legumes, by