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Pearson correlations between SVIs and grain yield at different growth stages.
| Year | Growth stage | Correlations |
|---|---|---|
| 1st year | NDVI booting | 0.526∗ |
| GNDVI booting | 0.564∗∗ | |
| SR booting | 0.461 | |
| NDVI milk stage | 0.418 | |
| GNDVI milk stage | 0.419 | |
| SR milk stage | 0.384 | |
| 2nd year | NDVI heading | 0.426 |
| GNDVI heading | 0.318 | |
| SR heading | 0.410 | |
| NDVI anthesis | 0.438 | |
| GNDVI anthesis | 0.464∗ | |
| SR anthesis | 0.413 | |
| NDVI milk stage | 0.402 | |
| SR milk stage | 0.382 | |
| NDVI dough stage | 0.361 | |
| SR dough stage | 0.346 |
∗p < 0.05, ∗∗p < 0.01, n = 20.
