... for, and seeds.Executive standard: ITEMINDEXRESULTAppearanceWhite crystalPASSN content(dry basis),% ≥21.021.20Water content(H2O),% ≤0.200.20Free acid(H2SO4)content ... )content,% ≤0.0050.005Water insolubles,% ≤0.010.01 AMMONIUM SULFATE 21% FERTILIZER