MATILDA MEMA , EMIL XHUVANI , KEJDA KRISTO ,FATBARDHA BABANI
KEYWORDS : Reflection spectra, Chl a, Chl b, a+b/x+c, R550, R750/R550, PRI
ABSTRACT :
Transmission and reflection spectroscopy are used as a non-destructive method for the assessment of chlorophyll in leaves. Reflectance is the best indicator of chlorophyll in the spectral region around 700nm and for this method the ratios R750/R700 are used. Reflection spectra demonstrating the optical properties of leaves provide information on reflectance in some specific wavelength. The measurements were carried out in three different types of leaves (sun, partial shade and shade) for Abbas (pear) variety in an area under water. The spectra allow determination of leaf color with x and y coordinates brightness, luminance as well as “dominant” wavelength. In the narrow band of wavelengths 531 nm and 570 nm, the diffuse reflectance values allow the calculation of the photochemical diffuse reflectance index (PRI).