The content originally appeared on: CNN Lagos, Nigeria (CNN Business)Africa's richest man Aliko Dangote opened the continent's largest fertilizer plant this week as war in Ukraine cuts off supplies from Russia, threatening a global food crisis. The $2.5 billion urea and ammonia fertilizer plant was commissioned by Nigeria's President Muhammadu Buhari in Lagos, where Dangote is also due to open a 650,000 barrels per day oil refinery, later this year. Dangote told CNN Tuesday that the urea market had 'gone […]