... tubes, drugs, chemical reagents, catalysts, ceramic glazes, glass, fertilizer, and flowers, vegetables, fruit trees and other cash crops spraying ... to customers requirements.Quality standard: ItemIndicatorHigh purityExcellentFirst gradeAgriculture gradePotassium nitrate (KNO3) content≥99.9%≥99.8%≥99.4%≥ ... (Fe ) content≤0.001%≤0.003%≤0.003% Potassium (K2O) content---------≥46.0%Nitrogen (N ) content---------≥13 ...