Ammonium Sulphate (AS) is a physiologically acid fertilizer, which is not recommended to be applied in acid soils with low pH. This mineral fertilizer contains 21% N and 24 % S and has greyish/yellowish color, with good solubility and low absorbency. It is mostly suitable for soils with high content of carbonates. It is applied mostly prior to sowing of the plants. It is used worldwide for sulphur consuming crops such as rapeseed, rice, etc. It is recommended that the applicable quantity per hca is determined based on an agrochemical analysis of the soil in order to avoid harmful acidification.