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Comparison of the regression slopes for the relationships between vegetation indices and stem water potential (Ψstem) on 19 September and 10 October in ‘Calatina’ olive trees (t-test, P < 0.05).
| Slope | P-value | ||
|---|---|---|---|
| 19 September | 10 October | ||
| NDVI | 0.018 | 0.106 | 0.008 |
| MSAVI | 0.016 | 0.126 | 0.004 |
| NDRE | 0.008 | 0.047 | 0.014 |
| NDGI | 0.01 | 0.107 | 0.005 |
| GNDVI | 0.017 | 0.088 | 0.007 |
| WI | -0.012 | -0.072 | 0.003 |
| CVI | 0.106 | 0.397 | 0.033 |
| GI | 0.031 | 0.348 | 0.005 |
