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Why legiminous crop are described in crop rotation

When crops like wheat {other than leguminous plant}are grown they use all nitrogen in soil ,which makes it uncomfortable to sow other crops but leguminous plant live with rhizobium in Symboitic relationship .Rhizobium bacterium  fixes nitrogen in soil.that's why leguminous plants are described in crop rotation .

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Leguminous crops are described because when the other type of crops are grown they utilise nitrogen. And to fix nitrogen again in the soil ,leguminous crops are effective.
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