The current battle against the rising dollar is influenced by the falling Euro. If the value of commodities sold in dollars remains stable, but the relative value of the dollar goes up compared to other currencies, the commodity price will go down. If decreased manufacturing worldwide [recession] causes lower demand of the commodity, again the price will go down.
The current Euro value downward is a greater deflationary weight than the Feds' easing policy [QE II +] with the result of short term deflation, at present. The end of the WAR of deflation has yet to be concluded in ~ 6 months, IMHO [after the Euro fell and printing of US dollars continues.]