Soil pH is an important chemical property because it affects the availability of nutrients to plants and the activity of soil microorganisms. Soil pH is a measure of the acidity or alkalinity of the soil with a scale of 0 to 14. The neutral point or balance for soil pH would be 7. As the number of the soil pH increases this indicates an increase in soil alkalinity. As the soil pH number decreases this indicates an increase in soil acidity. The ideal pH for most grass types is 6.5 to 7.0. This would be an optimum pH but different grass types can tolerate a range of pH levels -- see our grass species pH chart below. Note that some grass species such as centipede prefer a more acidic soil with pH levels around 5.0 - 5.5 considered optimum. Thus in most cases you may assume that your soil is not too acidic for centipede grass and you should NOT apply lime for centipede grass.
If your soil tests indicate too much acidity, then you would need to add lime to increase the alkalinity to reach your target pH. If your soil test indicates too much alkalinity, then you would add sulfur to increase soil acidity to reach your target pH. Please note that lime and sulfur can take up to 2 - 3 months (or longer) to react with soil. The soil pH should be tested again at this point in time and may require that the soil be treated again -- so be sure to allow for this extra time when planning your grass planting. You will also need to work the lime or sulfur at least 6 inches into the soil for the best and quickest results.
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