First derivative versus absolute spectral reflectance of citrus varieties

Carlos H. Blazquez; H. N. Nigg; Lou E. Hedley; L. E. Ramos; R. W. Sorrell; S. E. Simpson

doi:10.1117/12.243509

27 June 1996 First derivative versus absolute spectral reflectance of citrus varieties

Carlos H. Blazquez, H. N. Nigg, Lou E. Hedley, L. E. Ramos, R. W. Sorrell, S. E. Simpson

Proceedings Volume 2744, Infrared Technology and Applications XXII; (1996) https://doi.org/10.1117/12.243509
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

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.

Citation Download Citation

Carlos H. Blazquez, H. N. Nigg, Lou E. Hedley, L. E. Ramos, R. W. Sorrell, and S. E. Simpson "First derivative versus absolute spectral reflectance of citrus varieties", Proc. SPIE 2744, Infrared Technology and Applications XXII, (27 June 1996); https://doi.org/10.1117/12.243509

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