A subsidiary of PotashCorp. PotashCorp is the world’s largest fertilizer company by capacity, producing the three primary crop nutrients – potash (K), phosphate (P) and nitrogen (N). As the world’s leading potash producer, we are responsible for about 20 percent of global capacity. Our potash, phosphate and nitrogen products help provide the primary nutrients that crops need. They are also used to make livestock feeds and industrial goods.