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Abstract
Light sensors were constructed which measured narrow wavelength bands of radiation at 660 and 730 nm under field conditions. Both the spectral quality of radiation incident to the top of a corn crop and within the crop were recorded. The sensors were traversed horizontally through five types of corn canopies and at several heights. The radiation incident to the crop was spectrally stable through themidday, regardless of sky conditions. However, at lower Sun elevations a relative increase of 730 nm radiation was observed. Within the corn canopies the red wavelength is absorbed by the leaves, but the far-red is highly scattered. Consequently, the radiation within the crop is heavily enriched with 730 nm radiation with increasing depth into the crop. The enrichment of far-red within the crop canopy was greater at low Sun elevations. Some implications of the effects of these environments on the behavior of the phytochrome system of plants are discussed.
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