Table 3.

Test results of using the selected vegetation indices (GNDVI, RENDVI, NDWI, and the best two band combinations) computed from VIS–NIR–SWIR hyperspectral data to predict the six maize leaf properties

Leaf properties	GNDVI (550 and 800 nm)		RENDVI (705 and 750 nm)		NDWI (860 and 1240 nm)		Best two band combination
	R2	RPD	R2	RPD	R2	RPD	R2	RPD	Selected bands
Chlorophyll (µmol/m2)	0.847	2.56	0.805	2.27	0.063	1.03	0.921	3.54	730, 770 nm
Leaf water content (%)	0.045	1.02	0.045	1.02	0.094	1.05	0.428	1.32	1465, 2125 nm
Specific leaf area (m2/kg)	0.057	1.03	0.050	1.03	0.058	1.03	0.314	1.21	1870, 2275 nm
Nitrogen (%)	0.717	1.88	0.685	1.78	0.139	1.07	0.751	2.00	735, 745 nm
Phosphorus (%)	0.101	1.05	0.083	1.04	0.013	1.01	0.147	1.08	850, 860 nm
Potassium (%)	0.006	0.99	0.002	0.98	0.087	1.03	0.143	1.05	1215, 1325 nm