Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 November 1966
Published in Agron J 58:597-601 (1966)
© 1966 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Infrared Thermometry of Vegetation1

M Fuchs and C. B. Tanner2

Infrared thermometers with a bandpass filter from 8µ to 13µ can be used to measure the real temperature of vegetal surfaces with errors in the range of 0.IC to 0.3C. To do this the emissivity must be either known or determined and a correction accounting for the reflected radiation from the surroundings must be made. Values of emissivities found for dense canopies of alfalfa and of sudangrass were between 0.97 and 0.98. Emissivities of single leaves of snap bean and tobacco were 0.96 and 0.97, respectively. Depending upon the radiation of the surroundings corrections of +0.6C to .+1.4C had to be added to the apparent radiative temperature of these surfaces in order to yield real surface temperature.

1 Contribution from the Department of Soils. Published with the permission of the Director of the Wisconsin Agr. Exp. Sta. This work was supported in part by the National Science Foundation Grant No. GP-2404.

2 Research Assistant, and Professor of Soils.

Received for publication May 3, 1966.


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Environmental Quality		 The Plant Genome
Copyright © 1966 by the American Society of Agronomy.