Abstract
Ozalid paper and photosynthetically active radiation (PAR) sensors were used to measure the incident, transmitted, and reflected light above and below sorghum [Sorghum bicolor (L.) Moench] and soybean [Glycine max (L.) Merr.] canopies. Incident and reflected solar radiation fluxes were also measured. The Ozalid paper sensors that have a narrow‐band response in the blue wavelengths were greatly influenced by the spectrum of light to which they were exposed. The PAR sensors that have a quantum response were not affected by the shape of the visible spectrum. The Ozalid paper technique required a calibration curve relating the number of sheets bleached to the energy density. A comparison of the results obtained by Ozalid, PAR, and solar radiation sensors showed that significant errors were introduced when the calibration curve was obtained using the incident solar spectrum.
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