Definition:
This term represents the combination of evaporative losses from the soil surface and transpiration from the plant surface. These two phenomenona occur simultaneously and there is no easy way of distinguishing between them.
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