I have the sample results taken before we harvested grapes last week. These were from 1000 berry samples, crushed and juice plced in sample bottles and sent to Cornell Enology lab for analysis. We only harvested a relatively few of these and seeing the results, I think some could have hung on the vines a couple weeks more. The pH is generally still low. The TA is high in almost all of these varieties, but remember none of them are vinifera so they have the inherited higher acidity of their North American heritage. I have of few of the grapes above to work with, and now it gives me a better idea of what I have to work with, since I didn't test them all I have for pH and TA. Hopefully a pH meter will help with both tests.
Please do not read too much into these numbers as a true representation of what the varieties normally produce. Remember that it varies from every site and climate as well as time of harvest. I can see that I want to set my test lab up better than I have it now, since I have over 20 varieties to work with myself at some point in the future.
SampleVariety pH Brix TA g/L<?
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1. Lousie Swenson 3.01 16.9 8.13
2. Prarie Star 3.05 18.5 12.2
3. St. Pepin 2.92 20.2 12.9 *
4. NY 76.844.24 2.67 17.1 12.5
5. LaCrescent 2.93 21.9 15.8 *
6. Petite amie 2.95 18.1 9.9
7. ES 6-16-30 3.00 18.4 8.8 *
8. <?
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9. Edelweiss 3.10 14.9 6.5
10. Cayuga White 2.77 16.4 11.9
11. Vignoles 2.76 17.3 17.3
12. Baco 2.84 18.7 19.0
13. Landot 3.05 17.9 10.9
14. Noiret 3.05 16.2 14.2
15. Sabrevois 2.78 17.1 13.5 *
16. <st1
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17. GR7 2.99 17.8 14.6
18. <st1:City w
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19. Frontenac 2.99 19.7 17.5
20. Foch 2.97 20.3 13.6
* The varieties with * are ones I got grapes from last week. All are actively fermenting at this point.