# evapotranspiration

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## evapotranspiration

loss of water from the soil by direct loss plus loss through evaporation of moisture by plants growing on the soil.
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PAN] is the potential evapotranspiration on millimeter in each month.
As a result, measurement of monthly evapotranspiration by methods suggested in table 4 and a sum of these values as annual potential evapotranspiration is not recommended.
In order to determine best empirical equation when a lack of Lysimeter data occurs, through a comparison between method outputs and evaporation basin data, best empirical equation to measure monthly potential evapotranspiration of each area is determinable.
Abbreviation Environmental variable AET Mean annual actual evapotranspiration PETmin Minimum month potential evapotranspiration PET Mean annual potential evapotranspiration RAN Annual rainfall MAT Mean annual temperature Bio4 Temperature seasonality (st.
For example, for k = 1 the equation (2) uses the sum of total precipitation and the sum of total potential evapotranspiration in months October, November, and December in each year.
As a case study, the role of potential evapotranspiration in monitoring meteorological droughts in the two areas of contrasting climates of Iran (one in the south of the Caspian Sea and another in the north of the Persian Gulf) was evaluated.
Where PET is the potential evapotranspiration (mm/day), A is the slop of the saturation vapour pressure temperature curve (kpa/[degrees]c), [R.
Where PET is the potential evapotranspiration (mm/day), RH is the daily mean relative humidity (in percent), [R.
A common assumption is that applying water at amounts equal to 100% of potential evapotranspiration results in irrigation efficiency of 100%, defined as the ratio of cumulative root-water uptake to applied water.
The localized or actual leaching fractions determined from the computer simulations were about 25% to 30% for a water application equal to 100% of potential evapotranspiration.
The same plant rooting depth information and potential evapotranspiration data were used for all drainage treatments.
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