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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+)
Soil pH measures the alkalinity or acidity levels, which range from 0 to 14 on the pH scale. The middle (7) is considered neutral while levels falling below 7 are acidic and those above that number are alkaline. Letâs take a look at how to raise acid level in soil.