Well Bill, you at least grow some nice tree tops by the looks of what part of your picture did show up , at least!
As for urea, I have used it in the past on corn. It does a nice job, and I believe I have put it on both in dry form and mixed in water. We would side dress the established corn then go right after that and till or cultivate dirt over it. We used to have a small yard sprayer you pull behind a lawnmower...and I used it once while the corn was small. I moved the 2 spray tips on the bar so they fit on each side of the corn row, and then turned the sprayer on and drove. I couldn't really shut it down when I got to the end of the row , so just made my U turn in the yard, and hit each row, then shut the sprayer down at the end. Funny thing was, I had these 2 U shaped strips of bright green grass at the end of each row, that grew twice as tall as the other grass. It does kick it up a notch.
I only had 12 12 12 this yr, plus the cow manure put on earlier, so I am hoping that will suffice....but urea would have been better.
Another thing that does wonders for corn is a one row cultivator. If you plant your rows wide enough to get your tractor down the row, you can use one. On our clay ground, I used to like to till first, then use the cultivator to hill the row up some, and cover any small weeds. One time I got caught in a rain storm and had to leave a couple rows undone. In a week or so, there was a definate height difference...with the uncultivated corn being lower than the cultivated corn. It really seemed to respond to those shovels loosening up the soil deep I guess. I know that made a believer out of me.