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Published in Crop Sci 7:575-578 (1967)
© 1967 Crop Science Society of America
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Preliminary Wind Tunnel Studies of the Photosynthesis and Evapotranspiration of Forage Stands1

L. A. Hunt, Ivan I. Impens and E. R. Lemon2

Surface characteristics, photosynthesis, and evapotranspiration of vegetative stands of alfalfa and orchardgrass, grown in flats in a glasshouse, were investigated in a small wind tunnel. The windspeed parameters of the crop surfaces were determined at low radiation intensity at each of two windspeeds, and the rates of net photosynthesis and evapotranspiration were measured at the two windspeeds at each of three radiation intensities.

The roughness length (zo) increased with windspeed and was greater in orchardgrass. Rate of net photosynthesis, but not evapotranspiration, also increased with windspeed. In consequence, water use was most efficient under the highest wind regime. The rate of net photosynthesis increased to the intermediate radiation intensity, whereas evapotranspiration increased and water use efficiency decreased to the highest radiation regime.

The work indicated that a small wind tunnel of the type described would be useful for further studies of the photosynthesis and evapotranspiration of forage stands.

Key Words: alfalfa • orchardgrass • water use efficiency

1 Contribution from the Northeast Branch of the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the New York State Agricultural Experiment Station at Cornell University, and the Atmospheric Sciences Research Division, U. S. Army Electronics Command, Fort Huachuca, Ariz. Department of Agronomy Series Paper No. 717.

2 Research Associates, Department of Agronomy, Cornell University, and Research Soil Scientist, SWC, ARS, USDA, and Professor in Agronomy, Cornell University, Ithaca, N. Y. Present addresses: L. A. Hunt, Department of Crop Science, University of Guelph, Guelph, Ontario, Canada; Ivan I. Impens, Chair of Plant Ecology, State Faculty of Agricultural Sciences, Ghent, Belgium.

Received for publication January 30, 1967.




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