Savanna grass nitrogen to phosphorous ratio estimation using field spectroscopy and the potential for estimation with imaging spectroscopy

► Foliar N:P ratio provides a tool for understanding nutrient limitation on plant production. ► Foliar N:P is consequently crucial for understanding feeding patterns of herbivores. ► The results showed that CR and WR spectra in combination with PLSR predicted foliar N:P ratio with higher accuracy. ► A potential to estimate foliar N:P ratio using field spectroscopy and a simulated HyMap spectra is demonstrated.