Answer: Availability and sufficient water (ample water).
Evapotranspiration can
be defined as the sum of evaporation and plant transpiration from the earth
surface into the atmosphere which includes soil evaporation and vegetation. Thus,
Potential evaporation is the energy that is available to evaporate and
transport water from the ground into the atmosphere. However, the potential
evapotranspiration can determined by the availability and sufficient water
(ample water).
