Sulfur/Lime Treatments

Turf grass in Oklahoma generally performs best at a soil pH range of 6.5 to 7.0. When soil pH is too high or two low, sulfur or lime may be recommended.




< 5.5


Strongly acid

5.5 - 5.9


Medium acid

6.0 - 6.4


Slightly acid

6.5 - 6.9


Very slightly acid




7.1 - 7.5


Very slightly alkaline

7.6 - 8.0


Slightly alkaline

8.1 - 8.5


Medium alkaline

> 8.5


Strongly alkaline


Lime Treatments

When soil pH is lower than 6.5, soil is considered acidic. Lime is usually added to acidic soils to increase soil pH. Soil that is too acidic causes fertilizer waste. This means that fertilizer and important micro-nutrients become unused or wasted in the soil and are unavailable to your turf and ornamental plants. Waste may result in grass becoming thin and yellow, thatch building up faster, and root growth slowing down.

The addition of lime not only replaces hydrogen ions and raises soil pH, thereby eliminating most major problems associated with acid soils but it also provides two nutrients, calcium and magnesium to the soil. Lime also makes phosphorus that is added to the soil more available for plant growth and increases the availability of nitrogen by hastening the decomposition of organic matter.

The amount of lime to correct a soil acidity problem is affected by a number of factors, including soil pH, texture (amount of sand, silt and clay), structure, and amount of organic matter. In addition to soil variables the crops or plants to be grown influence the amount of lime needed. Lime is best applied at the recommended rates and times in accordance with the results of your soil test.

Sulfur Treatments

When pH is higher than 7.0, soil is considered alkaline. Lowering soil pH is best achieved by increasing soil acidity (a process known as acidification).  With the aid of water and soil bacteria, sulfur is slowly converted into sulfuric acid.  This conversion rate is dependant on the amount of soil moisture, soil temperature, and the presence of bacteria.  Once sulfur is applied it may take up to six months or a year to see a full decrease in soil pH. 

Please speak with your AgriLawn technician or sales representative about the proper treatment schedule for your needs.