Nitrogen fertilizer: urea, ammonium nitrate, ammonium bicarbonate, ammonium sulfate, calcium nitrate, sodium nitrate, ammonium chloride, liquid ammonia, ammonia phosphate: calcium magnesium phosphate, calcium superphosphate (common superphosphate), heavy calcium, phosphate rock powder potassium chloride, potassium sulfate compound fertilizer: refers to a synthetic fertilizer containing two or more N\P\K elements, including monoammonium phosphate ( ...