Question

What is replenising of nutrients

Answer 1

It just means that the nutrients are being replenished by the natural process...
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Answer 2

Repeated growing of crops in the same soil year after year results in the depletion of the various nutrients in the soil, as a result, soil loses its fertility and requires replenishment by crop rotation, by multiple cropping/ mixed cropping, by keeping the field fallow and  by addition of manure and fertilizers.

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