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Proceedings Paper

First derivative versus absolute spectral reflectance of citrus varieties
Author(s): Carlos H. Blazquez; H. N. Nigg; Lou E. Hedley; L. E. Ramos; R. W. Sorrell; S. E. Simpson
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Paper Abstract

Spectral reflectance measurements from 400 to 800 nm were taken from immature and mature leaves of grapefruit ('McCarty' and 'Rio Red'), 'Minneola' tangelo, 'Satsuma' mandarin, 'Dancy' tangerine, 'Nagami' oval kumquat, and 'Valencia' sweet orange, at the Florida Citrus Arboretum, Division of Plant Industry, Winter Haven, Florida. Immature and mature leaves of 'Minneola' tangelo had greater percent reflectance in the 400 to 800 nm range than the other varieties and leaf ages measured. The slope of the citrus spectral curves in the 800 nm range was not as sharp as conventional spectrometers, but had a much higher reflectance value than those obtained with a DK-2 spectrometer. Statistical analyses of absolute spectral data yielded significant differences between mature and immature leaves and between varieties. First derivative data analyses did not yield significant differences between varieties.

Paper Details

Date Published: 27 June 1996
PDF: 4 pages
Proc. SPIE 2744, Infrared Technology and Applications XXII, (27 June 1996); doi: 10.1117/12.243509
Show Author Affiliations
Carlos H. Blazquez, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)
H. N. Nigg, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)
Lou E. Hedley, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)
L. E. Ramos, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)
R. W. Sorrell, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)
S. E. Simpson, Univ. of Florida and Florida Dept. of Agriculture and Consumer Services (United States)


Published in SPIE Proceedings Vol. 2744:
Infrared Technology and Applications XXII
Bjorn F. Andresen; Marija S. Scholl, Editor(s)

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