E.B. Stone Naturals Soil Sulfur is designed to adjust the pH level of soil. Soil Sulfur helps lower the pH in alkaline soils. It also helps to maintain green color leaves and aids in the use of nitrogen fertilizer by the plant. Special Note: The amount of Soil Sulfur required to change the soil pH may vary considerably depending on the soil type, the climate conditions and the general composition of the soil. These conditions may require adjustments to the application rates recommended on the actual label. Derived from: Elemental Sulfur.