Effect of cultivar, cluster thinning, and growing season on fruit composition of own-rooted grapevines in the Yakima Valley, WA.
| Soluble solids (Brix) | Titratable acidity (g/L) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Treatment | 1997 | 1998 | 1999 | 2000 | 2001 | 1997 | 1998 | 1999 | 2000 | 2001 |
| Cultivar | ||||||||||
| Cabernet Sauvignon | 24.2 aa | 23.7 a | 23.0 a | 22.6 | 22.2 | 6.53 b | 5.68 c | 6.07 c | 5.88 c | 5.05 c |
| Riesling | 21.4 b | 21.3 c | 22.4 b | 22.0 | 21.9 | 10.18 a | 8.69 a | 8.33 a | 8.76 a | 7.89 a |
| Chenin blanc | ncb | 22.1 b | 22.2 b | 22.7 | 22.6 | nc | 6.57 b | 7.83 b | 7.68 b | 6.25 b |
| Thinning | ||||||||||
| Early | 23.0 | 22.6 a | 22.9 a | 22.4 | 22.2 | 8.30 | 7.03 | 7.38 | 7.49 | 6.41 |
| Late | 22.7 | 22.3 b | 22.3 b | 22.5 | 22.3 | 8.20 | 6.92 | 7.47 | 7.39 | 6.40 |
| Control | 22.7 | 22.2 b | 22.4 ab | 22.3 | 22.2 | 8.56 | 7.00 | 7.38 | 7.44 | 6.39 |
| Interaction | nsc | ns | ns | ns | ns | ns | ns | ns | ns | ns |
| pH | Color (A520/mL) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1997 | 1998 | 1999 | 2000 | 2001 | 1997 | 1998 | 1999 | 2000 | 2001 | |
| aMeans within columns followed by different letters differ significantly at p < 0.05 by Duncan’s new multiple range test. | ||||||||||
| bnc: data not collected. | ||||||||||
| cCultivar x thinning interaction; *, **, ***, ns: significant at p < 0.05, 0.01, 0.001, or not significant, respectively. | ||||||||||
| Cultivar | ||||||||||
| Cabernet Sauvignon | 3.54 a | 3.72 a | 3.65 a | 3.67 a | 3.81 a | 20.3 | 11.3 | 15.6 | 17.3 | 19.0 |
| Riesling | 3.08 b | 3.06 c | 3.11 b | 2.95 c | 3.49 c | nc | nc | nc | nc | nc |
| Chenin blanc | nc | 3.20 b | 3.14 b | 3.22 b | 3.67 b | nc | nc | nc | nc | nc |
| Thinning | ||||||||||
| Early | 3.26 a | 3.26 | 3.26 | 3.18 | 3.63 | 20.1 | 11.8 | 16.2 | 16.7 | 17.8 |
| Late | 3.24 b | 3.26 | 3.23 | 3.19 | 3.66 | 20.8 | 10.9 | 14.9 | 17.8 | 21.3 |
| Control | 3.25 ab | 3.24 | 3.24 | 3.20 | 3.62 | 20.1 | 11.2 | 15.6 | 17.3 | 18.0 |
| Interaction | ns | ns | ns | ns | ns | nc | nc | nc | nc | nc |