Fertilizer stocks are retreating in US pre-market trading after President Donald Trump agreed to a two-week ceasefire with Iran.

CF Industries is down 8.3 percent, while Mosaic and Nutrien have shed 2.7 percent and 4.3 percent respectively. These losses come even as S&P 500 futures trade up 2.7 percent.

On the Oslo Stock Exchange, Yara has slumped more than 12 percent.

Fertilizer producers had previously benefited from rising urea costs following supply disruptions linked to tensions in the Strait of Hormuz. The ceasefire is now easing that upward price pressure.

Year-to-date, Yara remains up 27 percent.