Soil fertility can be maintained without addition of nutrients due to

Floods

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Crop residue

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Activity of microorganisms

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Favourable temperature and water

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Solution

The correct option is D Activity of microorganisms
Microorganisms play an important role in degradation of dead bodies of plants and animals and animal excreta which releases the locked nutrients back into the ecosystem. Hence microorganisms are an important participant of all the biogeochemical cycles. Also microorganisms are involved in fixation of atmospheric nitrogen. Hence, soil fertility can be improved without addition of nutrients by the activity of microorganisms.

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