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This article in AJ

  1. Vol. 56 No. 3, p. 249-253

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Photosynthesis Under Field Conditions. VI. Solar Radiation Balance and Photosynthetic Efficiency1

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



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.

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