... High purity 100% water soluble Base fertilizer Ammonium sulphate 21 fertilizertech garde 21%(AS/SOA)Molecular Formula:(NH4)2SO4, Molecular Weight: ... 132.13,Appearance: white crystals, N: 21% min;Free acid as H2SO4:0.03% max,Moisture:0.3% max,Packing:50kgs plastic woven ... basis),% ≥21.021.020.5Water content(H2O),% 0.20.31.0Free acid(H2SO4)content,% ≤0.030.050.20Fe content, % ≤0.007--As content,% ≤0.00005 ...