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When pH is 1, 2 3 4 5 or 6, it is considered an Acid. When pH is 8 9 10 11 12 13 or 14, it is considered a Base. 7 is the neutral point of acid and base. pH is calculated by the -log (H+)
Raising pH The ideal pH range for soil is from 6.0 to 6.5 because most plant nutrients are in their most available state. Ifa soil test indicates a pH below 6.5, the usual recommendation is for the application of ground limestone. Inaddition to having the ability to raise pH, limestone contains calcium.