Doesn't this one paragraph w/Purdue info of late season (V15) kind of contradict what some have been proclaiming that y-drops performance gives vs earlier season application?

Copy/paste from Agrigold letter linked above:

Step# 5 – How to adjust nitrogen program to maximize performance:

When the growing season gets challenging and the corn crop is looking tough, growers tend to want to give up on the crop.  But, when nitrogen is the limiting yield factor, there is some amazing hope.  Two studies completed by Purdue University demonstrated that corn can recover from significant nitrogen deficiencies all the way to V15:

·        2010 study demonstrated that a V15 application of nitrogen yielded 100 bushels more than the starter only control and yielded only 13 bushel less than the V7 application of the same amount of nitrogen.

·        2007 study showed a 64 bushel advantage when the nitrogen was applied at V13 versus the starter only control and yielded 18 bushel less than the V3 sidedress application.