Crop water use, also known as evapotranspiration (ET), represents soil evaporation and the water used by a crop for growth and cooling purposes. This water is extracted from the soil root zone by the root system, which represents transpiration and is no longer available as stored water in the soil. Consequently, ET is used interchangeably with crop water use. The evapotranspiration process is composed of soil evaporation (E) and transpiration (T). Transpiration is the water transpired or lost to the atmosphere from small openings on the leaf surfaces. Evaporation is the water evaporated or lost from the wet soil and plant surfaces.
Iowa State University
Al-Kaisi, Mahdi, "Crop water use or evapotranspiration" (2000). Integrated Crop Management News. 2053.
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