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Published in Agron J 59:494-496 (1967)
© 1967 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Viewing Angle on Canopy Temperature Measurements with Infrared Thermometers1

M. Fuchs, E. T. Kanemasu, J. P. Kerr and C. B. Tanner2

Crop surface temperatures were measured with infrared thermometers at various viewing angles and for a range of solar zenith angles. The temperature readings of crops with continuous and uniform canopies were not related to the above angles. In the case of open row crops, the side of the row facing the sun was 1 to 3 C warmer than the shaded side.

Key Words: canopy temperature • infrared thermometer

1 Contribution from the Department of Soils, University of Wisconsin, Madison. Published with the permission of the Director of the Wisconsin Agr. Exp. Sta. This work was supported in part by the National Science Foundation, Atmospheric Sciences Section, Grant No. GP-2404, and in part by the Green Giant Co., Le Sueur, Minn.

2 Research Assistants and Professor of Soils. This work was completed while J. P. Kerr held a New Zealand National Research Fellowship.

Received for publication April 18, 1967.


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S. Irmak, D. Z. Haman, and R. Bastug
Determination of Crop Water Stress Index for Irrigation Timing and Yield Estimation of Corn
Agron. J., November 1, 2000; 92(6): 1221 - 1227.
[Abstract] [Full Text]


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Copyright © 1967 by the American Society of Agronomy.