The farming practice by which an exhausted land is left for a number of years...

Explanation

The question is asking about a farming practice where a land that has been used for cultivation is left unused for some years before it is used again. This practice is called bush fallowing. It is a way of allowing the land to regain its fertility and improve crop yield. Crop rotation is a farming practice where different crops are planted in a particular order on the same land over a period of time to maintain soil fertility and reduce pest and disease build-up. Continuous cropping is a practice where crops are planted on the same land repeatedly without allowing the soil to rest and regain its nutrients. This practice can lead to soil depletion and may result in low crop yield. Mono cropping, on the other hand, is a farming practice where only one type of crop is grown repeatedly on the same land. This practice can lead to soil depletion, pest and disease build-up and reduced crop yield. In summary, the farming practice where an exhausted land is left unused for some years before cultivation is called bush fallowing. This practice helps to improve soil fertility and crop yield. Crop rotation, continuous cropping and mono cropping are other farming practices used to maintain soil fertility and improve crop yield.