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Published in Crop Sci 10:3-6 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Method for Determining Net Photosynthesis and Transpiration of Plant Leaves1

D.J. Nevins and R.S. Loomis2

Apparatus and techniques for the determination of photosynthetic carbon dioxide exchange and transpiration of individual leaves are described and evaluated. Stable, high rates of photosynthesis were obtained with attached leaves after preconditioning in the leaf chamber at high levels of illmnination. Particular attention was devoted to providing adequate air turbulence within the chamber and to operating variables, temperature and relative humidity, with regard to their overall effect on CO2 exchange in leaves.

Key Words: Sugar beet • Leaf temparature • Boundary resistance

1 This work was supported in part by a James G. Boswell Foundation grant provided by the Agricultnral Research Center of the Stanford Research Institute, and was submitted as part of a thesis for the Ph.D. degree at the Univ.ersity of California.

2 Department of Botany and Plant Pathology, Iowa State University, Ames 50010, and Department of Agronomy, University of California, Davis 95616.

Received for publication December 16, 1968.




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