Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1970
Published in Agron J 62:66-69 (1970)
© 1970 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Evapotranspiration from a Snap Bean Crop1

T. A. Black, C. B. Tanner and W. R. Gardner2

A model is described in which trans iration from a loosely structured canopy is calculated from the potential evaporation, the evaporation from the soil, and the stomatal resistance weighted by the leaf area index of the field. Estimation of the evaporation from the soil requires the net radiation at the soil surface and the surface soil water content. A test of the model on snap beans (Phaseolus vulgaris L.) resulted in a 4% overestimation attributed to the inaccuracy of the estimate of the evaporation from the soil.

Key Words: Transpiration • Evaporation • Water balance • Canopy resistance

1 Contribution of the Department of Soil and Water Sciences, University of Wisconsin, Madison. Published with the permission of the Director of the Universit of Wisconsin Agricultiral Experiment Station. This wori was supported in part by USDA Hatch Funds and in part by Environmental Science Services Administration grant E-287-68 (G).

2 Formerly Research Assistant (now Assistant Professor, Department of Soil Science, Universit of British Columbia, Vancouver, Canada), and Professors o! Soil Science, University of Wisconsin, Madison 53706.

Received for publication May 27, 1969.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1970 by the American Society of Agronomy.