... low moisture 3.low heavy metal 4.N:21%,S:24 Ammonium sulphate 21%Molecular Formula:(NH4)2SO4,Molecular Weight:132.13 ... ,Appearance: white crystal, N: 21% min;Free acid as H2SO4:0.03% max,Moisture:0 ... released and forms a small amount of acid, lowering the pH balance of the soil , while contributing essential nitrogen for plant ...