CAN 26% N CALCIUM AMMONIUM NITRATE TOP FERTILIZER CAN fertilizer contains a total of 26% nitrogen in ammonium (NH4 +) and nitrate (NO3-) forms. It is a top fertilizer used in the fertilization of all plants except paddy, especially in lime-free soils with acidic pH. CAN fertilizer, on the one hand, provides the nitrate it needs to the plant as ready-made, on the other hand, it meets the nitrogen that the plant will need during the whole growing season by holding ammonium ions by soil colloids.