Question

If soil has all the nutrition, why do we need to replenish it

Answer 1

Answer:

Because when plants keep on using the nutrients it depletes the amount of nutrients in the soil. If we dont replenish the soil the crop will not grow very healthy due to lack of nutrients.

Explanation:

Answer 2

Soil has nutrition present in it initially, but after growing a crop or plant, it loses its fertility, since the nutrients are consumed by crop for its growth. Hence we need fertilizer and manure to replenish soil with nutrients.