Potassium Sulphate Granular(SOP) Potassium Sulphate [English Name] Potassium Sulphate Formula of potassium sulfate K2SO4, theoretical potassium (K2O) 54%, generally 50%, also contains about 18% of sulfur, sulfur is essential crop nutrients. Preparation of potassium sulfate potassium ore available, or the conversion of potassium chloride, or salt brine and other resources. Alunite is commonly used ...