Sulphate of Potash (SOP)

Sulphate of Potash (SOP, K₂SO₄) is a premium chloride-free potassium fertilizer containing 50-52% K₂O and 17-18% sulphur, making it the gold standard for chloride-sensitive high-value crops. With global SOP supply increasingly constrained by geopolitical disruptions to Belarusian and Russian exports, Dongkwang Poland offers reliable European-sourced supply chains backed by long-term off-take agreements with primary producers. SOP delivers two essential nutrients — potassium and sulphur — in a single application, improving crop quality parameters including sugar content, colour intensity, and post-harvest shelf life across fruits, vegetables, tobacco, and specialty crops.

SOP dissociates in soil solution into K⁺ and SO₄²⁻ ions. The potassium ion is adsorbed by soil cation exchange sites and taken up by roots through selective K⁺ channels, activating over 80 enzymes involved in photosynthesis, starch synthesis, and protein metabolism. The sulphate anion supplies plant-available sulphur essential for methionine and cysteine synthesis — amino acids critical for protein quality in oilseeds and cereals. Unlike MOP (KCl), SOP contributes zero chloride, preventing osmotic stress and quality degradation in sensitive crops.

Ideal For

Store in a dry, covered warehouse on pallets. SOP is mildly hygroscopic — reseal opened bags promptly. Maximum stack height: 3 pallets. Shelf life: 24 months in original packaging. Non-hazardous for transport (not ADR classified). Use standard PPE (gloves, dust mask) during handling. Keep away from strongly acidic materials.