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  • Benny Thompson

    Member
    December 30, 2022 at 12:24 pm
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    A lot of people miss an important detail about limestone or any form of calcium carbonate…

    Calcium carbonate is practically insoluble. It only impacts the chemistry when the soil is both wet and in presence of acids. The acid and the carbonate neutralize each other. This means that the higher the pH, the less impact limestone will have on soil. If your pH were 8.0, adding a ton/acre of limestone would have almost no impact This means that it would be nearly impossible to raise your pH from 4.0 to 7.0 with the recommended heavy applications. The soil will jump from 4.0 to 5.0 quickly, then from 5.0 to 6.0 more slowly, then from 6.0 to 6.5 even slower, then from 6.5 to 7.0 at a snails pace, and then it will take like a decade to go from 7.0 to 7.5. The more acidic the soil the faster the limestone raises pH. more alkaline soil = slower acting limestone

    (it’s important to note that these statements are not true for hydrated limestone which is calcium hydroxide. calcium hydroxide is caustic and will raise the pH immediately under any condition)