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Published online 1 May 1966
Published in Agron J 58:265-268 (1966)
© 1966 American Society of Agronomy
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Photosynthesis under Field Conditions. IX. Vertical Distribution of Photosynthesis Within a Corn Crop1

J. L. Wright and E. R. Lemon2

The vertical distribution of the photosynthetic fixation of carbon dioxide within a crop of corn was calculated from carbon dioxide profile data and transfer coefficients obtained by analysis of windspeed measurements. Infrared analyzers were used to measure the carbon dioxide concentration at several heights within and above the crop. The calculated total fixation for the day was approximately 60 g CO2 m–2 (equivalent to 470 pounds of sugar per acre per day). The results demonstrated the importance of the upper leaves in the fixation of carbon dioxide and showed the increased fixation by the lower leaves during periods of high light penetration. There was some indication that a coupling existed between the level of windspeed and fixation under conditions of high light and relatively low windspeed. With refinement in technique the method could be used to obtain more quantitative estimates of the distribution of photosynthesis in other crops.

1 Contribution from the Northeast Branch, Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the New York State Agr. Exp. Sta. at Cornell University. The work was supported in part by the Meteorology Dept., U. S. Army Electronics Research and Development Activity, Fort Huachuca, Ariz. Dept. of Agronomy Paper Series No. 679. This paper is a portion of the thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at Cornell University. Presented in part by the senior author before Div. S-l, SSSA, Denver, Colo., Nov. 18–21, 1963.

2 Formerly graduate student (now Research Soil Scientist (Physics) USDA) and Research Soil Scientist (Physics), USDA, and Professor. Agronomy, Ithaca, N. Y.

Received for publication June 21, 1965.


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E. Lemon, D. W. Stewart, and R. W. Shawcroft
The Sun's Work in a Cornfield
Science, October 22, 1971; 174(4007): 371 - 378.
[Abstract] [PDF]


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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
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Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1966 by the American Society of Agronomy.