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The attached chart gives the degrees brix, titratable acidity, and pH of several varieties sampled on 9/18/02.
| 09/18/02 | ||||
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| Variety | Location | Brix | TA | pH |
| Aurora | Rak Vineyard | harvested | ||
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| Cayuga White | Fredonia Lab | 17.9 | 0.92 | 3.21 |
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| Chambourcin | Rak Vineyard | 16.7 | 1.48 | 3.12 |
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| Chancellor | Rak Vineyard | 19.1 | 1.36 | 3.2 |
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| Chardonel | Rak Vineyard | 20.9 | 1.54 | 3.23 |
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| Concord | Fredonia Lab | |||
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| Cynthiana | Rak Vineyard | 18.7 | 2.54 | 3.19 |
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| DeChaunac | Fredonia Lab | 20.2 | 1.40 | 3.12 |
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| Delaware | Fredonia Lab | 20.7 | 1.00 | 3.29 |
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| Esprit | Rak Vineyard | 18.5 | 1.16 | 3.35 |
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| Foch | Fredonia Lab | 18.4 | 1.44 | 3.24 |
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| Frontenac | Rak Vineyard | 23.2 | 1.72 | 3.38 |
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| GR7 | Rak Vineyard | 22.7 | 1.05 | |
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| LaCrosse | Rak Vineyard | harvested | harvested | harvested |
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| Melody | Fredonia Lab | 18.6 | 1.15 | 3.13 |
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| Niagara | Fredonia Lab | harvested | harvested | harvested |
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| NY 62-0122-01 | Rak Vineyard | 16.7 | 1.30 | 3.43 |
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| NY 70-0809-10 | Rak Vineyard | 17.1 | 0.91 | 3.32 |
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| NY 73-0139-17 | Rak Vineyard | 19.9 | 1.00 | 3.22 |
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| NY Muscat | Rak Vineyard | harvested | harvested | harvested |
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| Seval | Rak Vineyard | harvested | harvested | harvested |
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| St. Croix | Rak Vineyard | harvested | harvested | harvested |
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| St. Peppin | Rak Vineyard | 22.8 | 1.20 | 3.32 |
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| St. Vincent | Rak Vineyard | 17.3 | 1.85 | 3.18 |
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| Traminette | Rak Vineyard | 20.6 | 1.35 | 3.06 |
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| Vidal | Rak Vineyard | 19.3 | 1.35 | 3.24 |
And just so you do not think we are only interested in wine varieties for our juice analysis. . . The attached figure shows the brix accumulation in Concord from a thinning experiment that we are running at the Fredonia Lab. Brix currently range from 14.5 to 16.5 depending on crop level.
Thanks to the rain this past week, we have recorded both an increase in leaf photosynthesis and berry weight in Concord.
Leaf Photosynthesis in Concord has been down for a month because of dry weather conditions. The little rain we received in August did not improve the situation. However, the ~0.3 inches of rain on 9/10 and 9/11 and the ~1.3 inches of rain that fell on 9/15 have given the vines a much needed boost. Mid-day photosynthesis has rebounded to 80-90% of maximum for the time being. With a full canopy, ripening fruit, and weeds back in the row centers, that amount of water will probably last less than a week under sunny and dry conditions. Luckily, more rain is in the forecast.
The other response to the rain that we have recorded is in Concord berry weight. At 30 days after bloom, I predicted that the final berry weight of balanced pruned vines would be 3.2 grams. From the berry curve, it looked like I was going to be right on the mark; however, the extra rain gave the berries a little jump up to 3.3 grams. This is a wonderful example of how a predicted final berry weight is only as good as the amount of water the vines receive after veraison.
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