The Potash Corporation of Saskatchewan, also known as PotashCorp, was a company based in Saskatoon, Saskatchewan. The company merged with Calgary-based Agrium to form Nutrien, in a transaction that closed on January 1, 2018.The company was the world's largest potash producer and the third largest producer of nitrogen and phosphate, three primary crop nutrients used to produce fertilizer. At the end of 2011, the company controlled twenty percent of the world's potash production capacity, two percent of nitrogen production capacity and five percent of phosphate supply. The company was part-owner of Canpotex, which manages all potash exporting from Saskatchewan. It also had a joint-venture with Sinochem named Sinofert. In late 2013, it was 60%-owned by institutional shareholders. In 2007, the CEO, William Doyle was by far the highest earning CEO in Canada, earning $320 million.