TABLE 3.
Total biomass (DW) of trunks, leaves, shoots, and roots; harvest index (yield to total biomass); and total chlorophylls (a + b) and total carotenoids of Cabernet Sauvignon grapevines (clone FPS08) subjected to different replacements of crop evapotranspiration (25% ETc, 50% ETc, and 100% ETc) during two growing seasons (2018–2019 and 2019–2020) and harvested in Oakville, CA, United States in November 2019 and October 2020, respectively.
| Leaves (kg/vine) | Shoots (kg/vine) | Trunk (kg/vine) | Roots (kg/vine) | Harvest index (kg/kg) | Shoot:root ratio | Total chlorophylls (mg/g DW) | Total carotenoids (mg/g DW) | |
| Treatments | ||||||||
| 25% ETc | 0.39 ± 0.03b | 0.42 ± 0.06b | 2.52 ± 0.19 | 0.97 ± 0.04b | 1.13 ± 0.10c | 0.48 ± 0.08 | 2.36 ± 0.70b | 1.15 ± 0.18b |
| 50% ETc | 0.47 ± 0.04b | 0.57 ± 0.06b | 2.89 ± 0.17 | 1.13 ± 0.10ab | 1.26 ± 0.13b | 0.50 ± 0.04 | 2.58 ± 0.47b | 1.29 ± 0.16b |
| 100% ETc | 0.81 ± 0.07a | 0.84 ± 0.20a | 3.09 ± 0.22 | 1.35 ± 0.13a | 1.51 ± 0.15a | 0.65 ± 0.03 | 5.59 ± 0.27a | 2.05 ± 0.10a |
| ANOVA | *** | *** | ns | * | *** | ns | *** | ** |
Values represent means (n = 6) separated by Duncan’s new multiple range test (p ≤ 0.05). Different letters within each column indicate significant differences as affected by the different irrigation amounts. ns, *, **, and *** indicate non-significance or significance at 5, 1, and 0.1% probability levels, respectively. DW, dried weight.