 Now, for the first time, the price of UAN32 has been back below $400 a ton since the second week of March of this year. That week, the average price was $397 a ton. Now, prices for the other fertilizers were down just slightly from a month prior. DAP had an average price of $778 a ton. MAP was $827 a ton, and potash $507 a ton, while UAN28 was at $350 for a ton.