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Coldwater, Michigan | Ryan,
True EDTA is fully Chelated and would not tie up with the "P". The issue you get into is some manufacturers combine the EDTA with other Chelating agents. That way you have staged availability, some now, some later. With EDTA that isn't needed because the metal is available to the growing crop, yet not able to tie up with the "P". Some of the other Chelating agents start tying up with "P" within as little as 15 minutes in the presence of "P", and that forms insoluble compounds.
If the dry compound is EDTA agent only, then it should be fine to use for your purpose. I might mix the dry with some water before adding it to 10-34-0.
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Zinc Sulfate vs 9% edta
