Table 2.
Calibration and test results of estimating leaf physiological and chemical properties of maize plants from VIS–NIR–SWIR hyperspectral reflectance spectra using support vector regression
| Calibration | Test | ||||||
|---|---|---|---|---|---|---|---|
| R2 | RMSEC | C | R2 | RMSET | MAPET (%) | RPD | |
| Chlorophyll (µmol/m2) | 0.950 | 27.0 | 1 | 0.946 | 28.5 | 5.59 | 4.30 |
| Leaf water content (%) | 0.765 | 1.42 | 1 | 0.703 | 1.81 | 1.58 | 1.83 |
| Specific leaf area (m2/kg) | 0.600 | 1.52 | 1 | 0.562 | 1.61 | 6.71 | 1.50 |
| Nitrogen (%) | 0.882 | 0.240 | 10 | 0.861 | 0.277 | 8.69 | 2.67 |
| Phosphorus (%) | 0.545 | 0.077 | 100 | 0.481 | 0.081 | 16.4 | 1.38 |
| Potassium (%) | 0.740 | 0.256 | 100 | 0.543 | 0.317 | 10.2 | 1.46 |