Derived crop coefficients for winter wheat using different reference evpotranspiration estimates methods

Abstract : This paper reports the results of using three empirical methods (Makkink, Priestley-Taylor and Hargreaves) for estimating the reference evapotranspiration (ET0) in the semi-arid region of Tensift Al Haouz, Marrakech (center of Morocco). The Penman-Monteith equation, standardized by the Food and Agriculture Organization (FAO-PM), is used to evaluate the three empirical methods. The obtained ET0 data were used to estimate crop water requirement (ET) of winter wheat using the crop coefficient (K-c) approach and results were compared with ET measured by the Eddy Covariance technique. The result showed that using the original empirical coefficients a, alpha and C-m in Hargreaves, Priestley-Taylor and Makkink equations, respectively, the Hargreaves method agreed fairly well with FAO-PM method at the test site. Conversely, the Priestley-Taylor and Makkink methods underestimate the ET by about 20 and 18 %. After adjustment of the original values of two parameters alpha and C-m coefficients in Priestley-Taylor and Makkink equations, the underestimation of ET was reduced to 9% and 4% for the Priestley Taylor and Makkink methods, respectively, which led to an improvement of 55% and 76% of the obtained values compared with the original values.
Type de document :
Article dans une revue
Journal of Agricultural Science and Technology, 2011, 13 (2), pp.209-221
Liste complète des métadonnées

Littérature citée [24 références]  Voir  Masquer  Télécharger

http://hal.ird.fr/ird-00668728
Contributeur : Dominique Bruel <>
Soumis le : mardi 24 avril 2012 - 17:09:38
Dernière modification le : jeudi 11 janvier 2018 - 06:15:37
Document(s) archivé(s) le : mercredi 25 juillet 2012 - 02:20:16

Fichier

Er-Raki-JAST-proof.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

S. Er-Raki, A. Chehbouni, J. Ezzahar, S. Khabba, E. K. Lakhal, et al.. Derived crop coefficients for winter wheat using different reference evpotranspiration estimates methods. Journal of Agricultural Science and Technology, 2011, 13 (2), pp.209-221. 〈ird-00668728〉

Partager

Métriques

Consultations de la notice

425

Téléchargements de fichiers

477