« on: September 20, 2012, 09:55:17 PM »
Just curious as to how much benefit you get from the yeast nutrient addition. I have not done this yet and after my current porter batch blowing through the fermentation lock 4 times in the last 3 days, I wonder if I need to ever add yeast nutrient. Current wort temp is 64 degrees so it is not over heating. I do make a 2.5L starter of about 1.040 SG, give it a swirl everytime I go by and have always had good fermentation starting within 12 hours.My understanding is that adding the nutrient is more about assuring yeast health in the case that you want to harvest the slurry for re-use, than it is about getting a good fermentation in the beer you add it to. I think for normal gravity beers (~1.060 or lower) you can get away just fine for that beer without any nutrient, but if you want to harvest that yeast then nutrient is a good idea. For big beers, nutrient may be a good idea whether or not you are going to harvest the yeast.
I don't have any reference to point to for this info, it's just what I've gleaned from various reading. Maybe someone else can chime in as I've wondered the same thing myself.