what are the method to restore the nitrogen concept of the soil?
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increasing nitrogen fixation, or by increasing the plant's uptake of soil or fertilizer nitrogen. extreme case, in which no nitrogen is fixed, the 15N enrichment of the control and legume would be the same.
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Nitrogen fixation is a chemical process by which molecular nitrogen (N
2), with a strong triple covalent bond, in the air is converted into ammonia (NH
3) or related nitrogenous compounds, typically in soil or aquatic systems [1] but also in industry. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms.
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