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2004•AgEcon Search (University of Minnesota, USA)Open access

Comparison of various methods for estimating reference crop evapotranspiration

M. Hossain Ali, M. G. Mostofa Amin, A. K. M. R. Islam, Ali, M. H., Amin, M. G. M., Islam, A. K. M. R.

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Abstract

The reference crop evapotranspiration (ET0) was estimated for three locations of Bangladesh using the standard Penman-Monteith (P-M) method as recommended by the Food and Agriculture Organization of the United Nations (FAO). The same was also estimated using four other emperical methods and compared with the standard method. The regression equations developed were evaluated with independent data sets. The superiority order were found as: FAO temperature, Radiation, Hargreaves and pan evaporation, respectively. It is revealed from the study that the regression equation developed herein with FAO temperature method can be used to estimate ET0 more accurately than the original FAO temperature method, as well as regression equations with other methods.

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What this paper is about

The reference crop evapotranspiration (ET0) was estimated for three locations of Bangladesh using the standard Penman-Monteith (P-M) method as recommended by the Food and Agriculture Organization of the United Nations (FAO). The same was also estimated using four other emperical methods and compared with the standard method. The regression equations developed were evaluated with independent data sets. The superiority order were found as: FAO temperature, Radiation, Hargreaves and pan evaporation, respectively. It is revealed from the study that the regression equation developed herein with FAO temperature method can be used to estimate ET0 more accurately than the original FAO temperature method, as well as regression equations with other methods.

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Available abstract

The reference crop evapotranspiration (ET0) was estimated for three locations of Bangladesh using the standard Penman-Monteith (P-M) method as recommended by the Food and Agriculture Organization of the United Nations (FAO). The same was also estimated using four other emperical methods and compared with the standard method. The regression equations developed were evaluated with independent data sets. The superiority order were found as: FAO temperature, Radiation, Hargreaves and pan evaporation, respectively. It is revealed from the study that the regression equation developed herein with FAO temperature method can be used to estimate ET0 more accurately than the original FAO temperature method, as well as regression equations with other methods.

Key concepts: Evapotranspiration, Crop, Environmental science, Agricultural engineering, Crop coefficient, Mathematics, Geography, Forestry

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