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Ammonium phosphate contains fermentable nitrogen (N) at 25g/HL = 50mg/L N and phosphorus. Nitrogen produces the protein needed to make new yeast cells.Most if not all yeast nutrient you buy these days already contains ammonium phosphate.
I am still learning at this site. Have a question for GrannieAnnie.You said you mix Grape wine with your Elderberry wine , do you do a half and half or how much each?Also part of my learning is to understand some of the words you all use here. As an example "demijohn". Here in Nebraska U.S.A. a john is some place we all have to go to when we "Have To Go" But I have figured out that you all mean it to be a glass jug, am I right? Please bare with me I am lrearning.