Crop Evapotranspiration - Guidelines For Computing Crop Water Requirements - FAO Irrigation and Drainage Paper 56

This online report from the Food and Agriculture Organization of the United Nations is a rich resource on evapotranspiration. The document includes a comprehensive introduction to evapotranspiration, methods of calculation, and an examination of evapotranspiration in crops. The report is easy to navigate with a detailed table of contents; navigational buttons; and links to figures, tables, and subsections.