Light Interception and Reflectance Measurements with Ozalid Paper
1971
Kanemasu, E. T. | Feltner, K. C. | Vesecky, J. F.
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.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library