How to Use Sulfur to Lower the pH in Soil

Soil pH level measures whether the soil is acidic or alkali. Some plants like azaleas and blueberries grow better in acidic soil that has a low pH value. These plants do poorly when grown outside their ideal pH range. Adding elemental sulfur is an inexpensive way to lower pH and allows naturally occurring soil bacteria to change the sulfur to sulfuric acid, which then lowers the pH level of the soil.

Soil pH tester or test kit
Elemental sulfur
Garden fork or tiller
Water

Instructions

- 1
  Take a soil sample to your local extension office to test the pH level. Pronged testers and home test kits are also available at your local garden center for self testing. Follow package direction to determine starting pH level.
- 2
  Find your goal pH level according to the requirements of the plants.
- 3
  Find your beginning and ending pH levels on the chart at the bottom of the page of the Clemson University Extension's Changing the pH of Your Soil webpage.
- 4
  Find the amount of sulfur in pounds per 10 square feet required by starting at your present pH on the chart and crossing it with the correct column for your desired pH level.
- 5
  Apply the proper amount of sulfur to the soil.
- 6
  Work sulfur into the soil with a garden fork or tiller.
- 7
  Wet the soil with water until moist, taking care not to overwater.

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