NITROGEN FIXATION
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Atmospheric nitrogen cannot be taken directly so they have to be fixed in the soil before it is being used by the plants.
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Nitrogen fixation can be carried out in two ways
(1) By microorganisms, (2) By lightening
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Rhizobium residing in the root nodules of leguminous plants and certain blue green algae helps in fixing atmospheric nitrogen.
Root nodules of leguminous plants