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Estimation of Reference Evapotranspiration during the Irrigation Season Using Nine Temperature-Based Methods in a Hot-Summer Mediterranean Climate
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Orientador(es)
Resumo(s)
The FAO-56 Penman–Monteith (PM) equation is regarded as the most accurate equation
to estimate reference evapotranspiration (ETo). However, it requires a broad range of data that may
not be available or of reasonable quality. In this study, nine temperature-based methods were assessed
for ETo estimation during the irrigation at fourteen locations distributed through a hot-summer
Mediterranean climate region of Alentejo, Southern Portugal. Additionally, for each location,
the Hargreaves–Samani radiation adjustment coefficient (kRs) was calibrated and validated to evaluate
the appropriateness of using the standard value, creating a locally adjusted Hargreaves–Samani
(HS) equation. The accuracy of each method was evaluated by statistically comparing their
results with those obtained by PM. Results show that the calibration of the kRs, a locally adjusted HS
method can be used to estimate daily ETo acceptably well, with RMSE lower than 0.88 mm day−1,
an estimation error lower than 4% and a R2 higher than 0.69, proving to be the most accurate model
for 8 (out of 14) locations. A modified Hargreaves–Samani method also performed acceptably for 4
locations, with a RMSE of 0.72–0.84 mm day−1, a slope varying from 0.95 to 1.01 and a R2 higher than
0.78. One can conclude that, when weather data is missing, a calibrated HS equation is adequate to
estimate ETo during the irrigation season
Descrição
Palavras-chave
reference evapotranspiration FAO Penman Monteith Hargreaves–Samani temperature based ET methods irrigation scheduling hot summer Mediterranean climate
Contexto Educativo
Citação
Rodrigues, G.C.; Braga, R.P. Estimation of Reference Evapotranspiration during the Irrigation Season Using Nine Temperature-Based Methods in a Hot-Summer Mediterranean Climate. Agriculture 2021, 11, 124
Editora
MDPI