Mention two ways by which soil can get nitrogen. -SST 10th

Mention two ways by which soil can get nitrogen. -SST 10th
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Answer :

(i) Use of fertilizer. (ii) Crop rotation: Rotation of crops is a system in which farmers grow pulses or leguminous crops after the harvest of a soil exhausting crop. Through this method the soil retains its fertility or gets back the nitrogen.
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