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Agroclimatology

Surface Energy Fluxes and Evapotranspiration of a Mango Orchard Grown in a Semiarid Environment

Federal University of Campina Grande, Av. Aprígio Veloso, 882, Bodocongó, Campina Grande, PB, Brazil, CEP: 58109-970

^* Corresponding author (vicente{at}dca.ufcg.edu.br)

Data from field experiments conducted in the semiarid climatic conditions of northeast Brazil were used to investigate the energy flux relations and evapotranspiration (ET) of a mango (Mangifera indica L.) orchard. The Bowen ratio–energy balance method was applied during the 1998–1999 fruiting cycles to estimate the energy balance components of the mango orchard, while the FAO Penman–Monteith approach was used for determining the reference evapotranspiration (ET_o). Results indicated that latent heat flux density (E) could be obtained, with reasonable precision, as a function of measured net radiation flux density (R_n). The percentage of R_n used as E was higher for the fruit growth and fruit maturation phenological stages, and lower for the flowering and fruit fall stages. For both field campaigns, E was found to be the major component of energy balance, comprising >70% of the available energy. Soil heat flux was always the smaller component, comprising <8%. Daily mean value of ET was higher during the 1998 fruiting cycle than that observed in 1999. Inversely, the ET increased approximately 6% from the 1998 to 1999 fruiting cycle. These results may be used for planning and management of irrigation for mangos grown in similar environmental conditions.

Abbreviations: , n, and m, van Genuchten soil parameters • ß, Bowen ratio • BREB, Bowen ratio–energy balance method • e_a, vertical gradient of vapor pressure • , slope of the saturation vapor pressure curve • T, vertical gradient of air temperature • DAF, day after flowering • DOY, day of year • e_s, saturation vapor pressure at air temperature • e_a, actual vapor pressure of the air • ET_o, reference evapotranspiration • ET, evapotranspiration • _m, matric potential • , psychometric constant • G, soil heat flux density • H, sensible heat flux density • E, latent heat flux density • K_c, crop coefficient • R_n, net radiation flux density • R_s, global solar radiation • SWC, soil water content • _r, residual soil water content • _s, saturation soil water content • VPD, vapor pressure deficit