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Título : Use of thermal units to estimate corn crop coefficients under semiarid climatic conditions
Autor : Martínez-Cob, Antonio
Palabras clave : Evapotranspiration
Irrigation
Water requirements
Crop coefficient
Lysimetry
Corn
Fecha de publicación : 2008
Editor: Springer
Citación : Irrigation Science 26: 335-345 (2008)
Resumen: Two crop coefficient equations were derived as a function of fraction of thermal units from lysimeter measured corn evapotranspiration (ETc-lys) during 1997 and 1998, and reference evapotranspiration obtained from: a) lysimeter measurements (Kcmes) or FAO Penman-Monteith (ETo-PM) estimates (Kcest-PM). For validation, corn evapotranspiration (ETc-est) was estimated in 2005 and 2006 from ETo-PM and: a) the equation for Kcmes with (ETc-est-lyslc) or without (ETc-est-lys) locally calibrated ETo-PM; b) the equation for Kcest-PM; and c) the FAO approach (ETc-est-FAO). The ETc-est_lys estimates showed the lowest bias (0.09 mm day-1); the ETc-est-PM and ETc-est-FAO, the highest (0.50-0.51 mm day-1). However, the root mean square error (RMSE, 1.23-1.27 mm day-1) and the index of agreement (IA, around 0.94) of the ETc-est-lys, ETc-est-lyslc and ETc-est-PM were similar. Therefore, ETc-est-lys is recommended although the ETc-est-lyslc was almost as accurate. The ETc-est-PM is less recommended due to poorer bias and systematic mean square error, and a general underestimation except for low corn ET values. For real time irrigation scheduling, the ETc-est-FAO should be avoided as RMSE (1.35 mm day-1), IA (0.93) and bias were slightly worse, corn ET was overestimated but for high values, and the length of the four phenological stages must be known in advance.
Descripción : The definitive editor version is available at: http://link.springer.com/journal/271 http://www.springerlink.com/content/h7270424k3j76459/
Versión del editor: http://dx.doi.org/10.1007/s00271-007-0097-5
URI : http://hdl.handle.net/10261/3097
DOI: DOI 10.1007/s00271-007-0097-5
ISSN: 1432-1319 (electronic version)
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