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Revista Brasileira de Engenharia Agrícola e Ambiental

versión On-line ISSN 1807-1929


SOUSA, Inajá F. de et al. Reference evapotranspiration in the irrigated perimeters of the state of Sergipe. Rev. bras. eng. agríc. ambient. [online]. 2010, vol.14, n.6, pp.633-644. ISSN 1807-1929.

The knowledge of reference evapotranspiration (ETo) is essential for the irrigation scheduling of crops throughout the world. This work used daily meteorological data of Class A pan evaporation, maximum and minimum air temperatures, insolation, wind speed at 2 m above surface and relative humidity from 1989 to 1993 for four irrigated perimeters of Sergipe. These data were used for estimating ETo based on the following methods: Class A pan evaporation, Solar Radiation, Hargreaves & Samani, Linacre and Penman-Monteith (FAO/56). The daily values of ETo were compared to those obtained by FAO Penman-Monteith method in order to choose the best method of estimating ETo for the region. The best performance was obtained for those models which used the solar radiation as the data input. The Class A pan evaporation method did not show favorable performance in any irrigated perimeter.

Palabras clave : water requirements; evaporation; Penman-Monteith method; gation scheduling.

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