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Some Aspects of the Relationship of Soil, Plant, and Meteorological Factors to Evapotranspiration¹

ABSTRACT

Evapotranspiration is a function of soil, plant, and meteorological factors. Attempts to predict evapotranspiration without considering all pertinent factors can meet with only qualified success.

It is found that evapotranspiration is controlled by: soil moisture tension, physiological factors, the relation of soil moisture of an irrigated area to that of its surroundings as well as purely meteorological factors of radiation, wind, air temperature, and humidity.

Examples are given of the effects of these factors on measured evapotranspiration.

¹ Contribution from cooperative work by the Soil and Water Conservation Research Branch, A.R.S., U.S.D.A., the Dept. of Agronomy, Texas Agr. Exp. Sta. and Dept. of Oceanography and Meteorology, A. & M. College of Texas. This research was supported in part by the Geophysics Research Directorate, Air Force Cambridge Research Center, under contract AF19(604)-997.

² Formerly Agent (Soil Scientist) U.S.D.A., Associate Professor of Meteorology, A. & M. College of Texas, and Agent (Irrigation Engineer) U.S.D.A., respectively. Authors' present addresses are: Bailey Hall, Cornell Univ.; Blue Hill Observatory, Harvard Univ.; and Dept. of Agr. Eng., A & M. College of Texas, respectively.

Received for publication May 7, 1956. Accepted for publication March 28, 1957.