A fertilizer composition is provided that includes sulphur and rock phosphate. The fertilizer composition can be a controlled release fertilizer that includes elemental sulphur, a rock phosphate, and a swelling material. The rock phosphate is present in the fertilizer composition in low amounts, e.g., 5% by weight or less. The fertilizer composition can be produced by mixing molten elemental sulphur with rock phosphate and cooling the mixture.
