Calcium ammonium nitrate is a nitrogen fertilizer made by melting ammonium nitrate and a certain proportion of limestone and dolomite powder. The composition is a mixture of NH4NO3, CaCO3 and MgCO3. Calcium ammonium nitrate has a nitrogen content of 21% to 26% (N), gray-white or light yellow granules or powder, and the aqueous solution is weakly alkaline.