Which irrigation method is least efficient due to evaporation?

Which irrigation method is least efficient due to evaporation?

• A. Drip Irrigation
• B. Subsurface Irrigation
• C. Overhead Sprinklers
• D. Soaker Hoses

Answer: (C)

The main concept here is irrigation efficiency and how evaporation losses affect water use. Water that evaporates before it can soak into the soil won’t reach the plant roots, so the method that loses the most to evaporation is the least efficient. Overhead sprinklers spray water into the air and across the plant canopy. In hot, sunny, or windy conditions, that water readily evaporates before infiltrating the soil, and some can even drift away or land on leaves where it evaporates. That makes this method the least efficient choice. In contrast, drip irrigation delivers water directly to the root zone through emitters, with minimal exposure to air. Subsurface irrigation places water below the soil surface, further reducing evaporation. Soaker hoses release water slowly along their length and allow it to seep into the soil with little surface evaporation. By keeping water close to or inside the soil, these methods conserve water compared to overhead sprinkling.

The main concept here is irrigation efficiency and how evaporation losses affect water use. Water that evaporates before it can soak into the soil won’t reach the plant roots, so the method that loses the most to evaporation is the least efficient. Overhead sprinklers spray water into the air and across the plant canopy. In hot, sunny, or windy conditions, that water readily evaporates before infiltrating the soil, and some can even drift away or land on leaves where it evaporates. That makes this method the least efficient choice. In contrast, drip irrigation delivers water directly to the root zone through emitters, with minimal exposure to air. Subsurface irrigation places water below the soil surface, further reducing evaporation. Soaker hoses release water slowly along their length and allow it to seep into the soil with little surface evaporation. By keeping water close to or inside the soil, these methods conserve water compared to overhead sprinkling.