I tried adding a little Yeast Nutrient to a demi-john of pear wine that was working slow. The wine fizzed up quite violently for a while. Was it because the yeast needed the fertilizer, or was it a chemical reaction?
Andie Z
a mixture of various nutrients, minerals, and dead yeast ("yeast hulls" or "yeast ghosts") which provide the materials necessary for yeast to reproduce and ferment vigorously. nutrients are helpful in almost any batch of beer or wine, and required in low-nutrient broths like mead.
Stephen SG
What you experienced was purely physical, Andie. Adding any solid granules to a fermenting must will cause the carbonic acid to change into carbon dioxide gas. Same thing happens when salt is put into beer. I've seen large amounts of wine lost due to this phenomenon combined with an careless cellarworker.
clyde
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