... %Min K2O: 46%Min Nitrogen: 13.5%Min SGS Certificate. High quality and Prompt shipment. Potassium Nitrate Purity: 99.8%Min K2O: 46%Min Nitrogen: 13.5%Min ... .250.30 % ≤0.25 Iron(Fe)% ≤0.003 % ≤0.003 K2O % ≤ 46Nitrogen ( in nitrate ) % ≥ 13.5Particle Size0.2-2.5 , 1 ... -3 , 2-5 , 0.2-5 Potassium Nitrate 99.4%min ,nitrate de potassium fertilizer(46-0-13.5)