Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 May 1964
Published in Agron J 56:253-259 (1964)
© 1964 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Photosynthesis Under Field Conditions. VII. Radiant Energy Exchanges Within a Corn Crop Canopy and Implications in Water Use Efficiency1

L. H. Allen, C. S. Yocum and E. R. Lemon2

Synopsis: Data are assembled giving sinks of shortwave radiation within a corn crop canopy. From these data, and from net radiation measurements obtained at 225-, 175-, 100-, and 20-cm. heights within a crop of corn 300 cm. high, net thermal radiation is calculated at those respective heights. Transmission data at those heights, using a Miller field light transmission photometer, indicate that shortwave transmission can be expressed as an exponential function of height as well as of cumulative leaf area index.

1 Contribution from the Northeast Branch of the Soil and Water Conservation Research Division, ARS, USDA, cooperating with the New York State Agricultural Experiment Station at Cornell University. The work was supported in part by the Meteorology Department, U. S. Army Electronic Proving Ground, Ft. Huachuca, Ariz. Dept. of Agronomy Series Paper No. 582. Special thanks go to Edward E. Miller, Dept. of Physics, Univ. of Wisconsin, for his advice on radiation measurements in the field; to C. B. Tanner, Dept. of Soils, Univ. of Wisconsin, for the use of his Miller field light transmission photometer; and to L. J. Fritschen, Agricultural Research Service, USDA, Tempe, Ariz., for the use of two of his hemispherically shielded net radiometers.

2 Soil Scientist, USDA, Ithaca, N. Y.; Associate Professor in Botany, University of Michigan, Ann Arbor, and Intermittent Plant Phyisiologist, USDA; and Soil Scientist, USDA, and Professor in Soil Science, Cornell University, Ithaca, N. Y.; respectively.

Received for publication July 11, 1963.




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Environmental Quality		 The Plant Genome
Copyright © 1964 by the American Society of Agronomy.