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Seasonal crop evapotranspiration and crop coefficient of pecan walnut in arid region of Mexico

Article number
1420_14
Pages
103 – 110
Language
English
Abstract
A multi-year (2017-2022) study was conducted to measure the seasonal variation of crop coefficient (Kc) and crop water consumption (ET) of pecan in the semi-arid environment of Sonora in northwestern Mexico.
Kc values were derived as the ratio between crop evapotranspiration measured with eddy covariance (ETc) and the reference evapotranspiration (ETo) estimated by the FAO-56 Penman-Monteith equation.
The results showed that the seasonal ETc and Kc was mainly controlled by leaf area index (LAI) and surface soil water content.
The daily Kc was the lowest at the beginning of season (January-March). It increased continuously up to full development stage (July-September) and decreased during the maturity stage.
The annual values of Kc were 0.91, 0.68, 0.77, 0.74, 0.69 and 0.76 from 2017 to 2022, with an average value being 0.76, which is very close to the value (0.75) recommended in the FAO-56 paper.

Publication
IX International Symposium on Walnut and Pecan
Authors
S. Er-Raki, J.C. Rodríguez, F. Cruz-Bautista, C. Lizárraga-Celaya, A.E. Castellaños-Villegas, A. Meddich, A. Ochoa-Meza
Keywords
crop coefficient, eddy covariance, crop evapotranspiration, pecan walnut, arid lands
Full text
https://doi.org/10.17660/ActaHortic.2025.1420.14
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