Abstract
Evapotranspiration rate from a given evaporating surface depends on the properties of the atmosphere only, if water is not a limiting factor. Transport of water to the evaporation surface or to the roots sometimes cannot cover potential evapotranspiration needs. The reason is the low hydraulic conductivity of the soil due to low soil water potential in the soil root zone. Then the evapotranspiration rate is less than the potential one, and the relationship between evapotranspiration rate and soil water potential of the root zone can be found and applied to calculate actual evapotranspiration. Empirically estimated relationships between relative transpiration (evaporation) are given and generalized, to allow calculation of actual transpiration (evaporation) from potential data calculated using standard meteorological data. Using the relationship between relative transpiration (evaporation) to calculate actual data is preferred, because of easy evaluation of it in comparison with soil water potential.
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