Potash giant Uralkali could increase the prices it charges exporters of complex fertilizers by $50 a metric ton in July after prices to China rose by the same amount earlier this year. “The increase will apply only to volumes of potash used to produce complex fertilizers for export,” chief executive Vladislav Baumgertner said Wednesday. The change in ruble terms would be a gain of almost 1,500 rubles ($53), or 26 […]