Explanation:

- ?? Mulching: This practice involves covering the soil with materials like hay or farm residue. It conserves moisture, reduces soil erosion, and conditions are improved for plant growth.

- Contour Bunding: This is used on slopes to reduce soil erosion. It involves building barriers along the contour lines.

- Crop Rotation: A farming practice of growing different types of crops in succession to maintain soil fertility.

- Tillage: The preparation of land for growing crops. It involves the turning, mixing, and breaking up of soil.

- Green Manuring: It involves growing and then plowing under a crop of green plants to enrich the soil.

Correct Answer: Mulching