Crop rotation is a technique of systematic plating of crops in a specific order over several years in the same agricultural field.
There is a specific level of nutrients in the soil, which is used by the plants.
Every specific plant has a specific requirement of nutrients from the soil.
As the crops are grown, the nutrients get depleted and hence a different crop is planted that requires the other nutrients to help the soil replenish its nutrients.
This is the benefit of crop rotation technique that keeps the soil enriched with all the nutrients.