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If Squatchy's calculations are correct, then 2 g/gallon dry yeast would cover all possibilities.

For instance, it's advised to have at least 300ppm postassium in mead. Now, if mead were pure water, this would be easy to understand, but instead, mead has a higher density. Ultimately, there are two possible ways to interpret the term "ppm": mass/volume or mass/mass, as explained here...

Well, according to https://www.winebusiness.com/tools/?go=winemaking.calc&cid=2114, N is none of the above but rather N = 40.

I'm having trouble locating a consistent answer to what N should be in the following statement: "1 gram of Fermaid-O provides N ppm YAN per liter." One source says N would be 50 ppm. Another says 30 ppm. Yet another says 10 ppm. What is the correct answer?

Do you need more yeast for high gravity fermentations? Yes, anytime you are pitching yeast into a harsh environment (high gravity, low temp) you need to add additional yeast. A rough rule of thumb is to double pitch rates above 1.065 and triple pitch rates above 1.085. Or, more technically, a...

Thanks! It reads as though they recycle the nitrogen, except when it's used for building a larger population of yeast. Well, that explains a lot, especially regarding the TOSNA nitrogen additions being timed to occur no later than the first sugar break. Presumably by then the poulation will...

At least with this 5 gallon batch of M05 traditional mead, the drama is over and its destiny is set. How it will finally taste and smell I do not know. SG is now 0.998, and I expect it will, after a long period of very slow continued fermentation, probably settle out at 0.995. It may well...

White Labs is now shipping some Kveik's, and among them is WLP4045, which is Voss.

On the other hand, the default pitch rate recommended by the TOSNA calculator is 2g/gallon: https://www.meadmaderight.com/tosna.html I think maybe my error was adding the first traunch of nutrients up-front at the very start rather than waiting 24 hours, as recommended by the TOSNA protocol...

It might also explain why I've had trouble nailing down the nutrient requirements for Hornindal Kveik, which I had been underpitching but nonetheless feeding nutrients from the get-go. Are there any other signals besides a 24-48 hour delay that might indicate when to add the nutrients after...

Maybe this also explains why loveofroses' advice is: 1 packet of dry yeast for 1 gallon and 2 packets of dry yeast for 5 gallons: https://www.homebrewtalk.com/current-mead-making-techniques.html It always puzzled me as to why, because it's non-proportional.

Thanks! That would explain it. When I did the successful 1 gallon M5 fermentation earlier in the year, I used one full packet (10g) of yeast. However, since then other forum members have said that 2g of yeast per gallon is more than sufficient and that even 1g of yeast per gallon is actually...

If it's true that the yeast can't extract nitrogen from the must above 10%, then how does the yeast meet its nitrogen needs when the ABV is above 10%? Is it drawing upon some kind of inner cellular nitrogen reserves that it built up when the ABV was lower? Or, is it accomplished some other...

As explained to me just recently by another forum member, it's a myth that raisins provide nutrients. I know you've read otherwise, because I've read it too, but if you look into it further, you'll find that it's a myth, and no one any longer believes it. Unfortunately, because so much was...

10 grams.

For sure it did, because it had expelled the the smell of HS2 even before I added the Fermaid-O, the addition of which was intended merely to avoid the production of more HS2. What would have been a better way to handle this situation? Would the HS2 age out if I had let it stay in? I just...

I wish I knew. The only other explanation I can think of is that the extra nitrogen is somehow a coping mechanism for some other kind of yeast stress that's being inflicted, but that's really nothing other than wild speculation on my part. I haven't seen any articles that say what to do when...

Ooops. Uh, no. Didn't know that. I think I heard something like that regarding DAP, and I thought that was supposed to be an advantage of Fermaid-O: that Fermaid-O was still useful at lower SG's (higher ABV's). Do you mean to say that even Fermaid-O will be of no use in this situation?

I used different honey with the 5 gallon batch than with the 1 gallon batch. Maybe that was a mistake. OG was verified to be 1.105 by a TILT hydrometer. Presently, pH reads 4.64 after 75 minutes of aeration with an aquarium pump. Not sure what it was before the aeration, but presumably lower...

Earlier in the year I did a 1 gallon BOMM but using M5 yeast, and it turned out extremely well using the nutrient amounts from the loveofroses' BOMM recipe. Now I'm nearing the end of primary fermentation on a 5 gallon mead using M5 yeast, but it's turning out that the nutrient requirements are...