QUANTITATIVE RELATIONSHIP BETWEEN LEAF NITROGEN ACCUMULATION AND CANOPY REFLECTANCE SPECTRA IN RICE AND WHEAT A study on a model of turf quality evaluation based on reflectance spectroscopy Quantitative relationship between leaf nitrogen concentration and canopy reflectance spectra in rice and wheat Correlation between pigment content and reflectance spectrum of Phyllostachys pubescens stems during its rapid growth stage The Correlation between the Pigment Content and Reflectance Spectrum in Phyllostachys edulis Leaves Subjected to High Temperature Chlorophyll Fluorescence Detected Passively by Difference Reflectance Spectra of Wheat (Triticum aestivum L.) Leaf