Table 5. The relationships the measured value and predicted value for LAI, nitrogen uptake and total chlorophyll content under the different nitrogen treatments for wheat.
| LAI | Nitrogen uptake | Leaf chlorophyll content | |||
| RMSE (g/m2) | RMSE (g/m2) | RMSE (g/m2) | |||
| OSAVI | 1.41 | OSAVI | 7.93 | OSAVI | 3.42 |
| biomass dry weight | 1.02 | biomass dry weight | 4.45 | biomass dry weight | 3.12 |
| OSAVI×BDW | 1.12 | OSAVI×BDW | 4.23 | OSAVI×BDW | 2.11 |
| OSAVI×OSAVI | 1.18 | OSAVI×OSAVI | 6.46 | OSAVI×OSAVI | 3.36 |
| OSAVI×SIPI | 1.36 | OSAVI×SIPI | 4.85 | OSAVI×SIPI | 3.02 |
| OSAVI×CIred edge | 0.98 | OSAVI×CIred edge | 3.98 | OSAVI×CIred edge | 0.65 |
| OSAVI×CIgreen model | 0.84 | OSAVI×CIgreen model | 4.12 | OSAVI×CIgreen model | 0.79 |
| OSAVI×EVI2 | 0.78 | OSAVI×EVI2 | 4.03 | OSAVI×EVI2 | 1.02 |