Agronomic performance of four training systems over the three-year study, 1990 to 1992.
| Year | System | Yield | Shoot/m2(kg/m2) | Pruning wt (kg/m2) | Ravaz index | Brix | Titratable acidity (g/L) | pH |
|---|---|---|---|---|---|---|---|---|
| a*, **, and ns indicate significance at p = 0.05, 0.01, and not significant, respectively. Differences between means per Duncan’s test at p = 0.05. Different letters in the same column indicate significant differences. | ||||||||
| 1990 | Single curtain | 1.86 ca | 3.27 b | 0.37 b | 5.27 | 23.5 a | 4.61 | 3.78 a |
| VSP | 2.23 ab | 4.39 a | 0.47 ab | 5.05 | 22.4 bc | 4.88 | 3.56 b | |
| High bush | 1.90 ab | 2.62 c | 0.40 b | 5.04 | 23.2 ab | 4.75 | 3.61 b | |
| Short bush | 2.20 a | 4.09 a | 0.58 a | 4.25 | 22.0 c | 5.18 | 3.63 b | |
| Significance | * | ** | * | ns | * | ns | ** | |
| 1991 | Single curtain | 2.11 a | 4.60 b | 0.32 | 6.93 a | 21.2 | 5.03 | 3.19 |
| VSP | 2.19 a | 6.77 a | 0.45 | 5.08 ab | 21.8 | 5.20 | 3.10 | |
| High bush | 1.57 b | 3.33 c | 0.33 | 4.97 ab | 22.7 | 5.14 | 3.26 | |
| Short bush | 1.44 b | 3.47 b | 0.43 | 3.71 b | 21.9 | 5.75 | 3.18 | |
| Significance | ** | ** | ns | * | ns | ns | ns | |
| 1992 | Single curtain | 1.57 b | 5.03 c | 0.49 b | 3.38 b | 24.0 a | 5.23 b | 3.57 a |
| VSP | 2.85 a | 9.58 a | 0.60 ab | 4.92 a | 22.5 b | 5.45 b | 3.42 bc | |
| High bush | 1.52 c | 4.83 c | 0.50 b | 3.15 b | 23.8 a | 6.33 a | 3.45 b | |
| Short bush | 1.80 b | 6.35 b | 0.69 a | 2.66 b | 22.1 b | 6.60 a | 3.35 c | |
| Significance | ** | ** | ** | ** | ** | ** | ** | |
| Significance of factorial analysis | Treatment | ** | ** | * | ** | ** | ** | ** |
| Year | ns | ** | ** | ** | ** | ** | ** | |
| Treatment · year | ** | ** | ns | ** | * | ns | * | |