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  • Which iron chelate? EDTA vs. EDDHA

    So I learned that there are two main kinds of iron fertilizers, the EDTA chelate and the EDDHA chelate.
    EDTA keeps iron in the soil with pH level of up to 6.0.
    EDDHA is good source of iron from pH 4.0 up to pH 11.
    So I was wondering which is the best chelate for my blueberries, since I don't even know the pH of my soil, but I guess it is under 6 because I fertilize with Ammonium Sulfate.

  • #2
    Probably the EDTA. Your soil is almost surely under 6.
    Alpine, Texas 4500ft elevation Zone 7