Richard Ha writes:

Fertilizer prices seem to have stabilized for the year. See the graphs at this Market Watch price page of PotashCorp.com.

Potassium Chloride, which is of special interest to banana farmers, is around $500/ton now. In the summer of 2008 it was nearly $900/ton.

Diammonium phosphate: Now, $500/ton. 2008, $1100/ton.

Sulfur: Now, $200/ton. In 2008, $700/ton.

The low price of natural gas is very helpful. As long as the demand can be met, its price should be relatively stable for the short term.