Update on April 11 2011: Obviously forecasting is a difficult task!
For May 2011, Corn is at $7.60/bu and Soybean at $ 13.84/bu
(Original article was of August 2009)
Here is a report about a research of the University of Missouri on some agricultural prices through 2014.
Prices are not seen increasing much, which tends to confirm an earlier report of the FAO.
Corn: $ 3.47/bushel in 2009/2010 to $3.98 in 2014/2015
Soybean: $9.44/bushel in 2009/2010 to $9.74 in 2014/2015
Nebraska direct steers (1,100-1,300 lbs.): $85.07 in 2009 to $100.05 in 2014
Twelve city wholesale broiler price: $.80/lb. in 2009 to $0.91 in 2014