Choose the correct statement about crop rotation.

Concept: Crop rotation is the practice in which a series of different crops are grown in the same areas across a sequence of the growing season.

When a single crop is grown in the same field over and over, it could deplete all the nutrients of the soil. Thus, some crops are grown alternatively so that nutrients from the soil can be replenished. Maize and Mustard are rotated in a single year. This practice increases the fertility of the soil.

Hence, the correct answer is option D.