RELATIONSHIP BETWEEN CANOPY HYPERSPECTRA PARAMETER AND LEAF NITROGEN CONCENTRATION IN COTTON Estimating Wetland plant leaf total nitrogen content based on optimal bands of reflectance from wetland vegetation Total nitrogen content estimation models of summer maize leaves using hyperspectral remote sensing Prediction of total nitrogen and alkali hydrolysable nitrogen content in loess using hyperspectral data based on correlation analysis and partial least squares regression. Optimization of a Model for Estimating Pterocarya stenoptera Chlorophyll Concentration with Hyperspectral Parameters Monitoring models for phosphorus content of apple flowers based on hyperspectrum Relationship between Canopy Hyperspectral Index and Leaf Nitrogen Accumulation in Cotton Application of hyperspectral data for soil organic matter estimation based on principle components regression analysis