Potassium sulfate is available in various agricultural size grades designed to meet the needs of the end user such as direct application, granulated mixtures, bulk blends, suspensions and solutions. • AG Granular • MINI Granular • AG Granular SOP Organic • MINI Granular SOP Organic • Choice Granular • Soluble Fines SOP Organic • Choice Granular SOP Organic • Standard Fines/Industrial Fines • MID Granular • Standard SOP Organic • MID Granular SOP Organic    The professional turf industry requires special SOP sizes to match specific needs, such as the use of dry blended fertilizer application for putting greens. Uniform grades of SOP have been developed to meet this highly specialized need. • Turf Blend™ Greens-Grade • Turf Granular • Turf Blend™ Mini-Granular • Product Pricing (New) • Material Safety Data Sheets • OMRI Listings