I have found that Mosaic produces some valuable pricing reports. The following is a sample.

Phosphate prices have taken another large step up during the past several

weeks. The published spot price of diammonium phosphate (DAP) fob

Tampa vessel jumped to $720 per tonne and the price of DAP fob Central

Florida rail car climbed to $615 per ton in mid-January. The chart shows

that the vessel price increased from $255 per tonne at the beginning of

2007 to the $435 per tonne range by mid-March 2007. Prices traded

around this level until mid-October and then took another step up to current

values. The same pattern holds for domestic prices.