Table 2.
Effects of trellis systems and applied water amounts on yield components and berry composition of ‘Cabernet Sauvignon’ in Oakville, CA in 2020 and 2021 a , b .
| Trellis | Irrigation | Trellis×Irrigation | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VSP | VSP60 | VSP80 | SH | HQ | GY | p value | 25%ETc | 50%ETc | 100%ETc | p value | |||
| 2020 | Berry Weight (g) | 0.97 a | 1.00 a | 1.01 a | 0.86 b | 0.87 b | 0.97 a | ** | 0.83 c | 0.96 b | 1.05 a | *** | ns |
| Cluster No. | 62.97 a | 32.39 bc | 30.36 c | 62.97 a | 38.11 b | 27.67 c | *** | 35.96 | 38.04 | 38.07 | ns | ns | |
| Cluster Weight (g) | 132.76 a | 133.40 a | 120.48 a | 74.17 c | 97.24 b | 138.97 a | *** | 100.00 b | 118.39 a | 130.12 a | *** | ns | |
| Skin Weight (mg) | 30.09 b | 30.87 b | 34.52 b | 44.90 a | 32.73 b | 32.27 b | *** | 3491 | 35.97 | 31.81 | ns | ns | |
| Yield (kg vine-1) | 4.27 ab | 4.34 ab | 3.56 b | 4.71 a | 3.56 b | 3.87 b | * | 3.39 b | 4.19 a | 4.58 a | ** | ns | |
| Leaf Area: Fruit (m2 kg-1) | 1.09 | 1.03 | 1.07 | 1.45 | 1.10 | 1.12 | ns | 1.19 | 1.13 | 1.12 | ns | ns | |
| TSS (°Brix) | 23.5 b | 23.7 b | 23.7 b | 24.6 a | 24.1 ab | 24.2 ab | * | 24.8 a | 24.1 b | 22.9 c | *** | ns | |
| pH | 3.47 a | 3.49 a | 3.46 ab | 3.40 c | 3.42 bc | 3.48 a | ** | 3.47 | 3.45 | 3.44 | ns | ns | |
| TA (g L-1) | 7.74 | 7.36 | 7.69 | 7.53 | 7.78 | 7.71 | ns | 7.50 | 7.70 | 7.80 | ns | ns | |
| 2021 | Berry Weight (g) | 1.00 ab | 1.03 a | 1.03 a | 0.88 ab | 0.83 b | 1.03 a | ** | 0.88 b | 0.94 b | 1.07 a | *** | ns |
| Cluster No. | 45.51 b | 48.86 b | 44.50 b | 88.28 a | 82.61 a | 39.86 b | *** | 55.94 | 56.97 | 62.04 | ns | ns | |
| Cluster Weight (g) | 148.72 ab | 153.96 a | 149.24 ab | 96.97 b | 126.54 ab | 168.59 a | ** | 121.78 b | 156.19 a | 144.04 ab | . | ns | |
| Skin Weight (mg) | 64.82 abc | 71.66 ab | 66.84 abc | 53.55 c | 57.00 bc | 73.86 a | ** | 60.40 | 64.11 | 69.36 | ns | ns | |
| Yield (kg vine-1) | 6.83 | 7.47 | 6.56 | 8.20 | 10.47 | 6.71 | ns | 6.13 b | 8.68 a | 8.21 a | . | ns | |
| Leaf Area: Fruit (m2 kg-1) | 0.74 | 0.66 | 0.76 | 0.70 | 0.56 | 0.65 | ns | 0.72 | 0.70 | 0.62 | ns | ns | |
| TSS (°Brix) | 23.1 a | 23.2 a | 23.3 a | 21.7 b | 21.9 b | 22.7 ab | * | 22.6 | 22.5 | 22.9 | ns | ns | |
| pH | 3.62 a | 3.59 ab | 3.57 ab | 3.55 b | 3.53 b | 3.58 ab | . | 3.59 | 3.56 | 3.57 | ns | ns | |
| TA (g L-1) | 5.98 | 5.96 | 5.89 | 5.63 | 5.71 | 8.43 | ns | 6.81 | 5.82 | 6.18 | ns | ns | |
a
Analysis of variance (p value indicated) Letters within columns indicate significant mean separation according to Tukey’s test at where “.”: p value< 0.1; where “*”: p value< 0.05; “**”: p value< 0.001, “***”: p value< 0.0001.
b
VSP, vertical shoot positioned; VSP 60, vertical shoot positioned 60°; VSP 80, vertical shoot positioned 80°; SH, single high wire; HQ, high quadrilateral; GY, guyot; TSS, total soluble solids; TA, titratable acidity; ETc, crop evapotranspiration; ns, not significant.