Ultrasol® SOP (potassium sulfate) Fully water-soluble crystalline source of potassium (K) and sulfur (S). It is used for fertilizing soil-grown crops during the ripening phase, supplying some of the potassium without the addition of nitrogen. In hydroponic systems, Ultrasol® SOP is primarily used as a source of sulphate for crops that require large amounts of sulfur. Ultrasol® SOP has an acidic pH, helping to prevent clogging of nozzles and drip lines of irrigation systems. Its use in alkaline soils is recommended.

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