Concept:Crop rotation is a farming method of growing different crops sequentially on the same land to maintain soil health.
Explanation:Growing the same crop repeatedly depletes specific nutrients from the soil.
Different crops have different nutrient requirements and root structures.
Legumes fix nitrogen in the soil, while deep-rooted crops bring up nutrients from lower layers.
Rotating crops also breaks pest and weed life cycles.
The primary purpose among the given options is to restore and maintain soil fertility naturally.
It is not done to reduce yield or increase pest incidence.
It does not directly change the physical texture of the soil.
Therefore, crop rotation is practised mainly to improve soil fertility.
Answer:C. improve soil fertility.