Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 May 1964
Published in Agron J 56:249-253 (1964)
© 1964 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Photosynthesis Under Field Conditions. VI. Solar Radiation Balance and Photosynthetic Efficiency1

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

Synopsis: A spectrophotometer with a sensitive range lying between 0.3 and 1.0 µ and its calibration and use are described. The spectrophotometer was used to measure the spectral characteristics of 0.3- to 10-µ radiation penetrating a dense stand of corn 300 cm. high (26,000 plants/acre, 29-inch rows, LA1 = 4.3) planted in north-south oriented rows. Transmission was quite low for the visible range, but was 30 to 40% from 0.75 to 0.9 µ. Efficiency of photosynthesis was 0.42 times the yield obtained from laboratory-grown Chlorella.

1 Contribution from the Northeast Branch of the Soil & Water Conservation Research Division, ABS, USDA, and the New York State Agricultural Experiment Station, Cornell University, cooperating. The work was supported in part by the Meteorology Dept., U. S. Army Electronic Proving Ground, Fort Huachuca, Ariz. Dept. of Agronomy Series Paper No. 559. Presented Nov. 28, 1961, to Division VIII, Amer. Soc. Agron. meeting jointly with the 4th Agr. Meteorological Conference of the Amer. Meteor. Soc. Special thanks are given Edward E. Miller, Dept. of Physics, University of Wisconsin, for advice on solar radiation measurements in the field.

2 Assoc. Professor in Botany, U. of Michigan, Ann Arbor, and intermittent Plant Physiologist, USDA; Soil Scientist, USDA; and Soil Scientist, USDA and Professor in Agronomy, Cornell University, Ithaca, N.Y., respectively.




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I. Zelitch
Improving the Efficiency of Photosynthesis
Science, May 9, 1975; 188(4188): 626 - 633.
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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1964 by the American Society of Agronomy.