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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+)
Correct soil pH. Soil pH level in your organic lawn is the measure of itâs acidity. Actually, itâs the levels of hydrogen ions but we wonât go that deep on this page. Lawn pH is based on a scale from 1 to 14 with 7 being neutral. A pH of soil below 7 the lawn is considered acidic and above is basic. Most turf grass, like a pH level at 6.4 to 6.8 which is slightly acidic. Most nutrient availability to the grass plant is optimum right around neutral, which is 7. So you can see having the correct levels is critical.