SurfCote® KS-4 Polymer-Encapsulated Sulfate of Potash SurfCote® KS-6 Polymer-Encapsulated Sulfate of Potash SurfCote® KS-9 Polymer-Encapsulated Sulfate of Potash SurfCote® N-4 Polymer-Encapsulated Urea SurfCote® N-6 Polymer-Encapsulated Urea SurfCote® N-9 Polymer-Encapsulated Urea