... fireworks, gunpowder, matches, fuses, candles, tobacco, color picture tubes, drugs, chemical reagents, catalysts, ceramic glazes, glass, fertilizer, and flowers, vegetables, fruit trees ... .25%---Iron(Fe ) content≤0.001%≤0.003%≤0.003% Potassium (K2O) content---------≥46.0%Nitrogen (N ) content---------≥13.5 ...