Calibration and validation of solar radiation-based equations to estimate crop evapotranspiration in a semi-arid climate.

Autor: Nikolaou G; Department of Agriculture Crop Production and Rural Environment, School of Agricultural Sciences, University of Thessaly, Fytokou Str., 38446, Volos, Greece. gnicolaounic@gmail.com., Neocleous D; Department of Natural Resources and Environment, Ministry of Agriculture, Agricultural Research Institute, 1516, Nicosia, Cyprus., Manes A; Netsens Srl, 50041, Calenzano, (FI), Italy., Kitta E; Department of Agriculture Crop Production and Rural Environment, School of Agricultural Sciences, University of Thessaly, Fytokou Str., 38446, Volos, Greece.
Jazyk: angličtina
Zdroj: International journal of biometeorology [Int J Biometeorol] 2024 Jan; Vol. 68 (1), pp. 1-15. Date of Electronic Publication: 2023 Nov 27.
DOI: 10.1007/s00484-023-02566-5
Abstrakt: The Abtew and Jensen-Haise solar radiation-based equations were used to estimate evapotranspiration, considering the limited climatic data in many locations. Both equations were proven to successfully predict the potential evapotranspiration (ET O ) compared with the standard Penman-Monteith (PM) method in two Mediterranean countries. Calibration of the constant coefficient k of the Abtew equation showed substantial differences compared to recommended values (1.22 vs. 0.53), with the highest values observed during September (1.46). Validation of ET O measurements using calibrated Abtew equation against the PM method indicated a high correlation coefficient (r 2  = 0.97, RMSE = 0.61). Further, evapotranspiration requirements, using the calibrated empirical equation, were calculated for olives (449 mm) and citrus (807 mm) showing a good agreement with recommended values for dry climate regions. Therefore, the tested equations could be safely used to predict frequencies and doses of irrigation in semi-arid climates, considering limited climatic data availability.
(© 2023. The Author(s).)
Databáze: MEDLINE
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