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本世纪初以来全球农作物单位面积产量不断增长，在一定程度上依赖于氮素化肥的施用量不断增加。农作物依赖于施用氮素化肥所获得的增产实际上是以消耗能源和污染环境为代价所取得的。在大气中氮气含量接近８０％，但这种氮气并不能直接为高等植物吸收利用。人类自从发现豆科植?
Since the beginning of this century, the output of crops per unit area in the world has been continuously increasing, and to a certain extent, the application rate of nitrogenous fertilizers has been continuously increasing. Crop yields, relying on the use of nitrogenous fertilizers, have actually been at the expense of energy consumption and environmental pollution. Nitrogen content in the atmosphere close to 80%, but this nitrogen can not be absorbed directly for the higher plants. Since human discovery of legumes?