Recovered elemental sulfur, is a byproduct from petroleum refining, natural gas processing, and coking plants. Generally, plants require about a tenth as much sulphur (S) as nitrogen (N), but sulphur deficiencies restrict plant growth as surely and severely as nitrogen deficiencies. Sulphur is essential for many growth functions in plants including nitrogen metabolism, enzyme activity and protein and oil synthesis. Enstar offers spot and term contracts on both granular and lump Sulphur.