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.

AB.W 5 LAI = 24 h where h is the crop height [m]. The stomatal resistance, rl, of a single leaf has a value of about 100 s m-1 under well-watered conditions. By assuming a crop height of 0.12 m, the surface resistance, rs [s m-1], for the grass reference surface becomes (Eq. 5):

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