Estimation of Chlorophyll and Nitrogen Contents in Cotton Leaves Using Digital Camera and Imaging Spectrometer A new hyperspectral index for the estimation of nitrogen contents of wheat canopy Estimation of optimum normalized difference spectral index for nitrogen accumulation in wheat leaf based on reduced precise sampling method. Optimization of a Model for Estimating Pterocarya stenoptera Chlorophyll Concentration with Hyperspectral Parameters Estimation model for plant leaf chlorophyll content based on the spectral index content Relationship of Leaf Nitrogen Status to Canopy Reflectance Spectra in Wheat Monitoring Leaf Nitrogen Accumulation with Canopy Spectral Reflectance in Rice

Quantitative Relationship between Leaf Nitrogen Concentration and Canopy Reflectance Spectra Estimation of Canopy Leaf Nitrogen Status Using Imaging Spectrometer and Digital Camera in Cotton