Ray ) wrote:
: I spoke just the other day with Bill Argo (Blackmore, PhD who designed the
: stuff for the MSU study), and they add a small amount of citric acid to the
: fertilizer to enhance solubility of some of the metallic ions.

My understanding is that citric acid is a chelating agent. So, the citric
acid (minus the H+) bonds to the metal ion preventing it from reacting with
other ions in the solution which could form a precipitate.

Dave