Just as you release water vapor when you breathe, plants do too - it's called transpiration. Plant transpiration is an invisible process. Even though you can't see the water, it is going into the air. When plants transpire faster than water is replaced, they can wilt or die.
Soils constantly lose water through evaporation. Evaporation increases as the days get hotter and longer in the summer.
Evapotranspiration, or ET, is the combination of water lost through evaporation and from transpiration. Generally, the amount of water lost through ET is equal to the amount of water that must be replaced to maintain healthy growing conditions. The rate of ET is affected by the amount of sun and wind, the air temperature, and other variables.
Read more about this at www.conserveh20.org
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