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Coldwater, Michigan | Kurt,
As to which one is best, that depends on what you are wanting to do with it. For instance: if you were to put the Citric chelation in a Phosphorous fertilizer, a certain amount of it would be tied up by the Phos and made unavaialble. The EDTA is completely chelated and would not be tied up by the "P".
If putting it in with your 28% where you don't have any "P" in the mix, then the citric would probably be just fine. Would work the same in water.
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Zinc Sulfate vs 9% edta
