Definition:
Combinaison des pertes par évaporation à la surface du sol et de la transpiration des plantes. Ces deux phénomènes se produisent simultanément et il n’existe pas de moyen simple de les distinguer.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO, 2000, Crop evapotranspiration – Guidelines for computing crop water requirements, By: R. Allen, L. Pereira, D. Raes, M. Smith, Irrigation and Drainage Paper 56