'Evapotranspiration' (ET) from a crop differs from 'potential ET' (PET) in that actual ET:
Choose the correct answer
Actual ET can exceed PET
Actual ET ≤ PET — limited by soil water availability; crop ET = Kc × ETo with Kc varying by growth stage
Actual ET is zero when it rains
Actual ET is always equal to PET
Correct Answer
B. Actual ET ≤ PET — limited by soil water availability; crop ET = Kc × ETo with Kc varying by growth stage
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PET: maximum ET when water supply is unlimited (reference crop condition). Actual ET: actual loss when soil moisture may be limiting. Actual ET ≤ PET always. Crop ET = Kc × ETo where Kc = crop coefficient (changes with growth stage), ETo = reference ET (grass or alfalfa, FAO Penman-Monteith). When soil moisture < field capacity, actual ET < Kc×ETo. Irrigation need = PET − effective rainfall.
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