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Crop evapotranspiration - Guidelines for computing crop ...

Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56. By Richard G. Allen Utah State University Logan, Utah, USA. Luis S. Pereira Instituto Superior de Agronomia Lisbon, Portugal Dirk Raes Katholieke Universiteit Leuven Leuven, Belgium Martin Smith water Resources, Development and Management Service FAO. FAO - Food and Agriculture Organization of the United Nations Rome, 1998. The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. FAO 1998. 1. evapotranspiration (ET). The combination of two separate processes whereby water is lost on the one hand from the soil surface by evaporation and on the other hand from the crop by transpiration is referred to as evapotranspiration (ET).

The amount of water required to compensate the evapotranspiration loss from the cropped field is defined as crop water requirement. Although the values for crop evapotranspiration and crop water requirement are identical, crop water requirement refers to the amount of water that needs to be supplied, while crop

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