Definition:
The crop evapotranspiration under standard conditions, denoted as ETc, is the evapotranspiration from disease-free, well-fertilized crops, grown in large fields, under optimum soil water conditions, and achieving full production under the given climatic conditions.
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