Reference crop evapotranspiration in distinct agricultural regions of Southern Brazil: a comparison of improved empirical models

Authors

DOI:

https://doi.org/10.13083/reveng.v29i1.12418

Keywords:

crop evapotranspiration, FAO-56, multi-climatic models, soil-plant-atmosphere system water balance, spatiotemporal models

Abstract

The FAO56 Penman-Monteith model is globally accepted for the accurate determination of reference evapotranspiration (ETo). However, a lack of appropriate data encouraged the improved model’s approach to estimate ETo. This study compared the performance of 10 empirical models of ETo estimation (Penman, Priestley & Taylor, Tanner & Pelton, Makkink, Jensen & Haise, Hargreaves & Samani, Camargo, Benevides & Lopes, Turc, and Linacre) contrasted with the FAO56 model in two regions in Southern Brazil. Data were collected from automatic stations of the Brazilian National Institute of Meteorology (INMET) from December 21, 2019, to February 28, 2021. The determination coefficient (R²), mean square error (nRMSE), mean bias error (MBE), Willmott index (d), and Pearson’s correlation coefficient (r), clustering, and Principal Component Analysis (PCA) were performed. For the different regions, the radiation-based model proposed by Penman was the best alternative for estimating ETo. The model showed the most appropriated values for R2 (0.9015) and r (0.9494). The clustering and PCA analyses indicated the interrelations of the meteorological data and the combination of the models according to the parameters used for the determination of ETo.

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Published

2021-12-17

How to Cite

Santos, M. S. N. dos ., Castro, I. A. de, Oro, C. E. D., Zabot, G. L., & Tres, M. V. (2021). Reference crop evapotranspiration in distinct agricultural regions of Southern Brazil: a comparison of improved empirical models. Engineering in Agriculture, 29(Contínua), 448–465. https://doi.org/10.13083/reveng.v29i1.12418

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Section

Agricultural Meteorology

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