CF Industries' (CF -4.2%) Q1 earnings rose 31%, but Dahlman Rose's deeper look implies this...

CF Industries' (CF -4.2%) Q1 earnings rose 31%, but Dahlman Rose's deeper look implies this is as good as it gets. The firm says unusually warm winter weather, which allowed for significant fertilizer application, a post-WWII record corn planting and other factors "created near perfect-storm conditions, which will be hard to exceed or even replicate in the near future."