Bobwins - ISX to KCL, I get it! KCL must be for KCl - Potassium Chloride. The market won't get it but the fertilizer guys will. N-P-K is the way fertilizer guys talk. 10-34-0 is 10% Nitrogen, 34% Phosphate, and 0% Potassium. 5-5-5 is called "Triple Nickel". 52-0-0 is "Urea". Kipp