Could Canada cut off potash to the U.S.? Here’s what’s at stake

Potash is a group of minerals and chemicals that contain potassium. Its main form, after deep-earth mining and milling, is potassium chloride (KCl), almost all of which is used as a fertilizer to improve crop root strength, disease resistance, water retention and yield by protecting and restoring soil fertility. This makes it essential to global food security.