I just googled wood ash and you might be right about no N., thus I apoligize. I got mixed reviews about weather it has or hasn't. most said no, so I am going with what you said and I do like your solution for K!
you'd da ''maine man''. got any pics? all sound good! Don't know about height, I got 2- 10 footers now and my worry is being top heavy. might bend them down a little at a time.
he'd have to be high all the time to be as stealth as he is.we had a report of him being sighted not to far from here in spring of 2008. it was on the history channel. makes you wonder huh??? I'd burn him down if he would come around. lol!
you'll be just fine! make sure they're getting plenty of light. if need to, open the area up a tad, but don't go nuts as you don't want to become noticed by air. corn ''will'' grow faster that your plants