Adding Sulfur
to clay soil is done in order to lower the alkaline levels in the clay, and raise the acidic levels. It's a process often used by gardeners, landscapers or farmers operating in regions where the soil contains a large proportion of clay. The sulfur used is usually in a powdered form that bacteria in the soil changes to sulfuric acid. By adding sulfur when needed, you help to alter the pH levels of the soil, creating a soil that's better able to support plant growth.
Instructions
1. Dig five holes, each six to eight inches deep, throughout your planting area. Take a soil sample from each hole and mix them together in a bucket.
2. Check the pH level of the combined soil. Home testing kits are available from most garden centers. The amount of sulfur you'll need to add will depend on your starting pH level and the size of the area you're adding the sulfur to. The type of sulfur added depends on any other deficiencies present in the soil. If iron is needed, use ferrous sulfate. If the clay is low in aluminum, use aluminum sulfate. Otherwise, powdered elemental sulfur should be used.
3. Use a garden tiller to break the clay soil into chunks by running the tiller blades over the surface of the soil. A garden tiller can be rented at a home improvement store or equipment rental shop. Add the sulfur to the soil and then till it again, working the sulfur throughout. To determine the amount of sulfur needed, consult the manufacturer's instructions.
4. Wait six to eight weeks for the bacteria in the soil to break the sulfur down to sulfuric acid. To speed up the process, add the sulfur during a warm month or keep the soil moist to increase bacterial behavior.
5. Re-test the pH level after the waiting period. You should be trying for a pH level of 6.5 pH units. Repeat the process of adding the sulfur if necessary. The entire process may take as long as a year to complete.
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