Fig. 2From: Using near-infrared spectroscopy to predict nitrogen and phosphorus concentrations of herbarium specimens under different storage conditionsLeaf nutrient contents for nitrogen and phosphorus in relation to the studied plant species and the N- and P-fertilization in the fertilization experiment, based on wet-lab measurements. The color coding is red for Centaurea jacea L., blue for Plantago lanceolata L. and yellow for Poa annua L.Back to article page