Question

if soil has all of the nutrients, then why do we need to replenish it ?​

Answer 1

Answer:

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It is necessary to replenish the nutrients into the soil because all the nutrients that soil has are used up by the plants during their growth so for the continuos supply of nutrients to the plants it is necessary to replenish the soil again and again.

Explanation:

I hope it's helpful for you

Answer 2

Answer:

we should do so because when we plant trees they take those nutrients and to repay the nutrition we should replenish the soil.