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Estimate of the alpha parameter in an oat crop under rain-fed conditions

Authors

  • Facundo Carmona,

    Corresponding author
    1. Departamento de Física de la Tierra y Termodinámica, Universidad de Valencia, Burjassot, Valencia, Spain
    • Instituto de Hidrología de Llanuras Dr. Eduardo J. Usunoff, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
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  • Raúl Rivas,

    1. Instituto de Hidrología de Llanuras Dr. Eduardo J. Usunoff, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
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  • Vicente Caselles

    1. Departamento de Física de la Tierra y Termodinámica, Universidad de Valencia, Burjassot, Valencia, Spain
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Correspondence to: Facundo Carmona, Instituto de Hidrología de Llanuras Dr. Eduardo J. Usunoff, Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, Tandil 7000, Argentina.

E-mail: facundo.carmona@rec.unicen.edu.ar

Abstract

In this article, we estimated the alpha parameter of the Priestley–Taylor model under rain-fed conditions. This study was conducted in an oat crop, from 7 September to 22 October 2009, in a region of subhumid plains (Tandil, Argentina). An energy balance station was installed within the experimental field to monitor its development. The alpha parameter value obtained was 1.41 ± 0.01, which led to an overestimation of the evapotranspiration of just 2% and a relative error in estimating evapotranspiration of 8%. The results suggest that the alpha parameter obtained is adequate in estimating the evapotranspiration of oat crops or similar crops in subhumid plains of Buenos Aires, Argentina. Copyright © 2012 John Wiley & Sons, Ltd.

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