Answer: (c) Border strip irrigation
Explanation: Border strip irrigation is an efficient method of irrigation for close-growing crops. Mulching is a practice of covering the soil surface with materials like plant residues, straw, leaves, or plastic film to reduce evaporation. Check basin is a method of irrigation with beds and channels for retaining water to form a pond. Contour farming is the farming practice of ploughing across a slope following its elevation contour lines.
