SOP: Potassium Sulphate also is known as Sulphate of Potash, is 100% water soluble source of Potassium (K) and Sulphur (S), It can be used in the greenhouse, open field for vegetables, cereals, oilseeds, lawn, turf, and nurseries. SOP advantages are: 1. Increase drought, heat and cold tolerance in plants. 2. Improve fruits size, weight, quality, and yields. 3. Free flowing with no residues. 4. UV protected packaging for maximum benefit.