Fig. 1From: High-throughput analysis of leaf physiological and chemical traits with VIS–NIR–SWIR spectroscopy: a case study with a maize diversity panelBoxplots comparing the leaf properties of maize plants from Field− N, Field + N, and greenhouse groups. The groups assigned to different letters indicated their means were different by Tukey’s Honest Significant Difference test (p value < 0.05)Back to article page