D
DavidCampen
Guest
I do not believe it is the added citric acid which makes that the pH of the solution is acid. Since a few years I make all my fertilizers myself (yes I like experimenting). I was never able to conceive(design) a fertilizer which did not give a slightly acid reaction in deionized water. Citric acid is probably used as a chelator.
Yes, in my formulations, I use diammonium citrate to bring the pH up to 5.7-6.3, otherwise it would be at 5.0 or below in RO water, especially when using any ammonium nitrate in the formulation (I also add borate as boric acid).