Explain the Biological and Physical methods of Nitrogen fixation.

Biological method : Plants need nitrogen in orderto prepare food. There is a bacterium called Rizobium [lives in soil] which converts Nitrogen into usefull Nitrates. So that plants can absorb nitrogen directly from the soil.

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Biological methods :  bacteria like Rizobium , Azotobactor , etc.
Physical methods : Industrial nitrogen fixation.
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