Delivers water directly to plant roots—most efficient.

• A. Center Pivot Irrigation
• B. Drip Irrigation
• C. Flood Irrigation
• D. Sprinkler Irrigation

Answer: (B)

Delivering water directly to plant roots reduces losses from evaporation, runoff, and wind drift because the water is placed where plants can use it rather than onto open soil. Drip irrigation achieves this by delivering small amounts of water right at the base of each plant through emitters, at low pressure and with precise timing. This targeted, low-volume delivery keeps moisture in the root zone with minimal surface wetting, making it far more water-efficient than other methods. Center-pivot and sprinkler systems apply water from above, which is more prone to evaporation and uneven distribution, while flood irrigation wets the field surface and wastes water through surface runoff and deep percolation. For these reasons, drip irrigation is the most efficient way to deliver water to plant roots.