Eric Miller, R.L. (Bob) Nielsen, and Jim Camberato of Purdue Extension have recently offered an article about late season Nitrogen applications when weather or other factors keep you out of the field beyond when is optimum. In brief, the article compares corn with N applied at V7 (7 visible leaf collars) or V15 (a week or two from silking) and a control with only starter N applied. While corn with the V7 sidedress outperformed that with the V15 application, it wasn't by much and both applications far outperformed corn receiving no sidedress.
It's a good article and you should read it through but in essence, even if you're late and have to get creative with equipment, Nitrogen application still pays off.
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