Which factor is critical for determining a landscape water budget?

• A. Soil texture
• B. Exposure to sunlight
• C. Evapotranspiration rate (ETo)
• D. Plant color

Answer: (C)

The evapotranspiration rate (ETo) is a fundamental factor in determining a landscape water budget because it represents the amount of water that is lost through evaporation from the soil and transpiration from plants. Understanding ETo is essential for calculating how much water a landscape needs to maintain healthy plant growth while avoiding overwatering or underwatering. It accounts for climatic conditions such as temperature, humidity, wind speed, and solar radiation, which all influence water loss.

In a water-efficient landscape, accurately assessing ETo helps in tailoring irrigation schedules and determining the water needs of different plants, ultimately leading to more sustainable water use. By utilizing ETo data, landscapers can ensure they provide adequate moisture to plants while minimizing waste, aligning with the goals of water conservation and efficiency.