ChrisinCowiche
Posts: 7845
Joined: 12/16/2009 From: Cowiche, WA Status: offline
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I'm not aware of anyone who has done a controlled trial where this might stand out. I know many wineries who use stems in varying amounts but unless it was same lot of fruit, same vineyard, same vintage, I think the other variables might dilute the study. Somebody out there may be doing this, though. A small study might be worth doing if you knew somebody growing Syrah and Pinot side by side who was willing to take a couple hundred pounds or so and ferment them in separate batches and then keep them separate through secondary fermentation, cooperage and bottling, keep all other variables as consistent as possible. If you want to help design the study and sample the results, I'll do it for 2017 vintage, I'm interested enough in the question to play around a bit with a few hundred pounds of fruit. My plan would be do a "main batch" in whatever stem load I want then do a couple of small batches with ZERO stems and 100% whole cluster. Hardest challenge might be oaking similarly, but with 3-6 gallon batches (carboy sizes), it can be done.
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