Abstract
Accurate estimation of crop evapotranspiration (\(ET_{c}\)) considering global warming is a key aspect to optimize water application, yield and fruit quality for sustainable blueberry production. This study quantifies daily crop \(ET_{c}\), diurnal dynamics of the surface energy balance (SEB) and the crop factor (CF) of a drip-irrigated blueberry (Vaccinium corymbosum) orchard field. CF is defined as the ratio of \(ET_{c}\) and reference ET. \(ET_{c}\) and the SEB were measured using an Eddy Covariance (EC) system every 30 min during four growing seasons. Results show maximum values of available energy, Net Radiation (Rn) minus soil heat flux (G), reached 18 MJ m–2 d–1, while that the sum of turbulent fluxes extended to 17 MJ m–2 d–1. Maximum values of latent heat (\(\lambda E\)) normally occur on November–December from 10 to 11 MJ m–2 d–1. The correlation between Rn between crop rows and Rn above the crop canopy-soil surface was 0.73 during all growing seasons. G below the canopy represents 5% of Rn above the crop canopy-soil surface. During this study, \(ET_{c}\) reached up to 5.0 \(mm\, d^{-1}\) when \(ET_{o}\) was 7 \(mm \,d^{-1}\). Maximum \(ET_{c}\) values occur during December. Weekly specific CF varied from 0.5 to 0.8 from October to March. CF showed no significant variation year to year suggesting that they could be used by farmers to better predict water demand and improve water use efficiency. To our knowledge, there are no previous studies at a field’s scale documenting all components of the daily SEB and its diurnal dynamics over blueberry orchards.
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Acknowledgements
The research leading to this report was supported by the Chilean government through the projects FONDECYT CA13I10129, FONDEF IT13I20002, FONDEF IT18I0008, ANID SEQUIA FSEQ210019, Centro de Recursos Hídricos para la Agricultura y Minería (CRHIAM) (ANID/FONDAP/15130015) and the Laboratory of Investigation and Technologies to the Water Management in the Agriculture (ItecMA\(^{2}\)). Specially acknowledge to Pedro Carrasco Peña and Pedro Carrasco Moreno from CarSol Fruit for their important advise and support during this study.
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O.L. designed the study, O.L., C.S., A.P., and M.KO. processed the dataset, C.S. prepared the figures. All authors wrote and reviewed the manuscript.
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Lagos, L.O., Souto, C., Lillo-Saavedra, M. et al. Daily crop evapotranspiration and diurnal dynamics of the surface energy balance of a drip-irrigated blueberry (Vaccinium corymbosum) orchard. Irrig Sci 42, 1–13 (2024). https://doi.org/10.1007/s00271-023-00869-4
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DOI: https://doi.org/10.1007/s00271-023-00869-4