Name three natural methods of replenishing the nutrients of the soil. Are these natural methods sufficient to maintain the fertility of the soil?

CBSE Class 8
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Name three natural methods of replenishing the nutrients of the soil. Are these natural methods sufficient to maintain the fertility of the soil ?
A . Field fallow, crop rotation and mixed cropping are three natural methods of replenishing the nutrients of the soil. These natural methods are not enough and farmers have to resort to manures and fertilisers.