Sulphur
Sulfur also plays a role in the formation of chlorophyll, which is necessary for photosynthesis. Sulfur fertilizers provide plants with a source of sulfur. These fertilizers are usually in the form of elemental sulfur or sulfate compounds.
Elemental sulfur must first be converted into sulfate by soil bacteria before plants can use it. Sulfate compounds such as ammonium sulfate, calcium sulfate, and potassium sulfate are more readily available to plants.
