How much Nitrogen is left?

A big question this fall is, how much nitrogen is left in our corn fields.  University of Illinois did a study sampling around 130 sites.  How much nitrogen is left now is not really important.  The real question is, "How much will be left during the growing season in 2013?" On the up side, it is good to see U of I using real data instead of just guessing as they often do when it comes to nitrogen management.