MATILDA MEMA , EMIL XHUVANI , KEJDA KRISTO , FATBARDHA BABANI
KEYWORDS : Reflection spectra, Chl a, Chl b, x+c, R550, PRI.
ABSTRACT :
Reflection spectra demonstrating the optical properties of leaves provide information on reflectance of some specific wavelength. The measurements were carried out with three types of leaves (sun, partial shade and shade) for the Santa Maria and Abbas pear varieties in an area under water. In both varieties, an increase in reflectance values is observed from 500 nm to 650 nm wavelength region, the green-orange region of the spectrum, and further there is a rapid increase between 680 nm-740 nm wavelength region, the of the spectrum. red and infrared. The green plants absorb less and reflect more in these two ranges. The content of chlorophylls (Chl a+b), total carotenoids (x+c) and pigment ratios Chl a/b and Chls to carotenoids (a+b)/(x+c) were determined on the green leaves of the fruit trees in three positions to solar radiation. 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).