Quantitative Relationship between Leaf Nitrogen Concentration and Canopy Reflectance Spectra Monitoring Canopy Leaf Nitrogen Concentration Based on Leaf Hyperspectral Indices in Rice Comparisons of Leaf Traits among Different Functional Types of Plant from Huoshan Mountain in the Shanxi Province Quantitative relationship between leaf nitrogen concentration and canopy reflectance spectra in rice and wheat Leaf nitrogen resorption efficiency of Stipa purpurea and its determinants along a precipitation gradient on the Changtang Plateau Comparisons of leaf traits among 17 major plant species in Shazhuyu Sand Control Experimental Station of Qinghai Province Effect of nitrogen concentration in the subtending leaves of cotton bolls on the strength of source and sink during boll development Leaf traits of 66 herbaceous species in Songnen grassland in Northeast China Effects of nitrogen concentration in subtending leaves of boll on related enzymes and strength formation of cotton fiber Effects of Fruiting Branch Position, Temperature-Light Factors and Nitrogen Rates on Cotton (Gossypium hirsutum L.) Fiber Elongation Quantitative Relationship between Hyper-spectral Red Edge Position and Canopy Leaf NitrogenConcentration in Rice