See ive been doing a little homework on this idea. The nitrogen in milk is bound-up in protein, but bacteria and fungi in the soil will break this down and
some of the nitrogen will be released as nitrate or ammonia. These nitrogen-containing ions can then be taken into the plant roots for growth. I think that im going to actually attempt this on my plant since its having a Nitrogen Deficiency, but for all you other people out there who are thinking about attempting this and you use sugar in your feedings then DO NOT I repeat DO NOT give them milk, it will encourage bacteria and fungus's to grow. For no im going to go with a ratio of 25% milk 75% so its going to be pretty diluted and im going to use skim milk to make sure no fat is in it