Which of the following cropping methods maintains soil fertility?

(i) Mixed cropping

(ii) Crop rotation

(iii) Mono cropping

(iv) Inter-cropping

The correct option is D Only (i), (ii) and (iv)

• Mixed farming is the process of growing crops and livestock animals in same area. In mixed farming manure is available from livestock animals maintains soil fertility.
• Crop rotation is the method of cultivation in which different crops are cultivated on the same land in successive seasons. It helps to maintain soil productivity.
• Mono-cropping is the pattern of cropping of a similar type of plant in the same land throughout the year. It reduces biodiversity and increases the difficulty in nutrient cycling.
• Intercropping is the practice of growing two or more crops on the same piece of land in alternate rows. It increases land productivity and acts as insurance for the farmers during crop failure.

Thus, the correct answer is option D.