Do higher corn prices justify more nitrogen?

With rising grain prices and rain keeping us out of the fields it may be worthwhile to take a look at nitrogen rates for 2009. The table shows various nitrogen cost and $4.50 per bushel corn to calculate the maximum return to nitrogen application. Rates that approach 180 seem to be in the ballpark except with nitrogen above 50 cents per unit.

The nitrogen rate calculator for Ohio can be found at: http://agcrops.osu.edu/fertility/documents/New_Nitrogen_Recommendations_2009_new.xls