Potassium Sulfate is a very important product. It's used to supply potassium. Conventional agriculture, for the most part, supplies potassium with a muriate of potash or what's called 0-0-60. We don't handle that because it has chlorides. It's potassium chloride which is very detrimental to soil biology.
Potassium Sulphate (K2SO4) or Sulphate of Potash (SOP), is the world's most popular low-chloride fertilizer. Combining Potassium (50% K2O) and Sulphur (18%) SOP offers a high concentration of nutrients readily available to plants.
Sulphate of Potash has a very low salinity index making it the preferred potash fertilizer in areas at risk from soil salinity.
SOP improves crop yield and quality, making plants more resistant to drought, frost, insects and disease.
Not only does Potassium Sulphate improve the crop's nutritional value, taste and appearance but also its resistance to deterioration during transport and storage, and its suitability for industrial processing.
Potassium is the third major plant and crop nutrient after nitrogen and phosphorus. Potash is the common name for various mined and manufactured salts that contain potassium. Today, potash is produced worldwide at amounts exceeding 30 million tons per year. Potassium chloride (KCl) accounts for most of the K used in world agriculture (about 90%). Other widely used K products include potassium sulfate, potassium nitrate, and potassium-magnesium salts.
Potassium bearing minerals are mined from underground ore deposits, salt lakes and brines. Then, the ore must be beneficiated and purified using dry and slurry processes.
The majority of mined KCl is used for obtaining various grade fertilizers based on the particle size (granular, standard, fine, soluble). Granular KCl is often applied in mixtures with other N and P based fertilizers to provide, in one application, the nutrients required by the crops.
Another potassium fertilizer is potassium sulfate, which is frequently used for crops where additional chloride from more common KCl fertilizer is undesirable. Potassium sulfate can be extracted from the mineral langbeinite or it can be synthetized by treating potassium chloride with sulfuric acid at high temperature. By adding magnesium salts to potassium sulfate, a granular potassium-magnesium compound fertilizer can also be produced.