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Description: Evapotranspiration formulas which utilize routine meteorological data have been developed by Thornthwaite (16), Blaney and Criddle (1), and Penman (7, 8, 9). Some of the methods are based upon empirical correlations of measured evapotranspiration and air temperature (1, 16) whereas others (7, 8, 9) account for the radiant energy available at the evaporating surface. Each of these methods has enjoyed considerable success in the area for which it was developed and when applied under restrictive conditions similar to those which prevailed during its period of empirical evolvement Unfortunately, each of the methods noted above is used under widely differing climatic types where the crop development, soil moisture, and environmental conditions are at variance with those for which the method was originally developed.

Keywords: evapotranspiration estimates in a semiarid climate
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Citation: Pelton, W. L. and H. C. Korven 1969. EVAPOTRANSPIRATION ESTIMATES IN A SEMIARID CLIMATE. Canadian Agricultural Engineering 11(2):50-53.
Volume: 11
Issue: 2
Pages 50 - 53
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Date: 1969
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Coverage: Canada
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