I put about a 1/2 teaspoon to 1 teaspoon per gallon. I don't know if it truly makes a difference but the plants don't seem to mind it at all. I put it in just ph'd water and use it when they first sprout and I water with an eyedropper around the outer edges of my peat pod that my sprout is in.
I also use molasses. About 1 teaspoon per gallon. I grow in soil, usually

Happy Frog. I add molasses about every two feedings, but I am far from an expert grower.