The correct option is C. Surface irrigation. Explanation of the Correct Answer Surface irrigation is a method that involves the application of water to the soil surface and allows it to flow over the field by gravity. This technique uses furrows, which are small channels dug into the soil, to direct water to the crops. The water moves along these furrows, reaching the plant roots while minimizing evaporation and runoff. How Surface Irrigation Works:

1. Furrow Creation: Farmers create furrows between rows of crops. These furrows are designed to guide water directly to the plants.
2. Water Application: Water is applied at the top of the furrow, and it flows down the furrow by gravity.
3. Infiltration: As the water moves, it infiltrates the soil, allowing moisture to reach the root zone of the plants.
4. Minimizing Evaporation: Since the water is applied directly to the soil surface and not sprayed into the air, evaporation is minimized.
5. Reducing Runoff: The controlled flow of water in furrows helps to reduce runoff, as the water is absorbed into the soil rather than flowing away.

Why Other Options Are Incorrect A. Drip irrigation: - Drip irrigation involves the use of tubes or pipes with emitters that deliver water directly to the base of each plant. While it is highly efficient and minimizes evaporation and runoff, it does not use furrows. Instead, it focuses on delivering water directly to the root zone, which is different from the surface irrigation method that utilizes furrows. B. Flood irrigation: - Flood irrigation involves flooding the entire field with water, which can lead to significant evaporation and runoff. This method does not use furrows to direct water; instead, it saturates the entire area, which can be inefficient and wasteful compared to surface irrigation. D. Subsurface irrigation: - Subsurface irrigation involves placing water delivery systems below the soil surface, which allows water to be delivered directly to the root zone without surface application. This method does not utilize furrows and is designed to minimize evaporation and runoff, but it operates differently from surface irrigation. Summary of Key Points

• Surface irrigation uses furrows to direct water to crops, allowing for efficient water use.
• It minimizes evaporation and runoff by applying water directly to the soil surface.
• Other methods like drip, flood, and subsurface irrigation do not utilize furrows in the same way, making them less suitable for this specific question.
• Understanding the differences between these irrigation methods is crucial for effective water management in agriculture.

Revision Summary

• Surface irrigation uses furrows to guide water to crops.
• It minimizes evaporation and runoff effectively.
• Drip, flood, and subsurface irrigation methods differ significantly in their approach.
• Knowing the characteristics of each irrigation method is essential for agricultural practices.