Sidedressing?

If you got your corn planted but did not get Nitrogen applied, then you will be sidedressing unless corn gets too big. Anhydrous would be my material of choice. There is less material to apply. Also, remember you can cut back your rate by 25% with no adverse effects. If you don't trust that, have a PSNT done on your field and find out how much you really need. You might be surprised.

Check out this Prairie Farmer Article.

http://farmprogress.com/story.aspx/nl18_14nl/five/options/for/adding/nitrogen/after/planting/9/38252