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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

From: High-throughput analysis of leaf physiological and chemical traits with VIS–NIR–SWIR spectroscopy: a case study with a maize diversity panel

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