Chapter
Apr 26, 2012
Estimating Crop Coefficients from Fraction of Ground Cover and Height
Publication: World Environmental and Water Resources Congress 2009: Great Rivers
Abstract
The crop coefficient is the ratio of actual ET to reference ET and is heavily controlled by the amount of vegetation present to transpire water. This relationship can be used to estimate values for the crop coefficient as functions of the amount of ground covered by vegetation. A method established in the FAO-56 publication is expanded in this paper to estimate the crop coefficient from the fraction of ground cover and height of vegetation. In addition, when estimates of average background soil evaporation are made, then the `mean' or single crop coefficient can be estimated. Estimates from the method are compared with measured crop coefficients reported for a number of vegetable crops during the crop development periods. Results are promising.
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Published In
World Environmental and Water Resources Congress 2009: Great Rivers
Pages: 1 - 15
Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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Professor of Water Resources Engineering, University of Idaho, 3793 N. 3600 E., Kimberly, Idaho 83341. E-mail: [email protected]
Luis S. Pereira
Professor, Superior Institute of Agronomy, University of Lisbon, Portugal
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.