Which of the following methods of cultivation makes soil fertile?

Excessive use of chemical fertilizers

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Extensive cultivation

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Crop rotation

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Monocropping

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Solution

The correct option is C Crop rotation
Crop rotation is the practice of growing of different types of crops in alternate season. The cash crops grown in one season is replaced by leguminous plants in the other season. The nutrients which are used up by the previous crops are regained by the second crops. So, crop rotation maintains soil fertility and prevents soil erosion.
So, the correct answer is option C.

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