I used to put down NH3 before planting, in my heavy wet clay it seemed to work very well. I put 100lb granular down with the planter, typically only 9 lbs N in that.
Now been trying to build my poor P and K levels the past 2 years, as long as they are going over with an airflow in spring have them put down urea with it too. Still run 100 lbs granular, with some micros on the planter, think that rich band of fert helps the corn in my soils, my cold springs.
I think I liked the NH3 better than the urea, it seems a slow release, a little more was there at the end, the urea seems to want to go away if we get too much rain. The corn will look nice all summer, but seems to hit a wall of lack of N when it should be filling the kernels....
My neighbor uses his dairy manure and neighbors hog manure for the P and K every other year application, he side dressed liquid N. got burned with it this year, with the rains the corn was quite big and yellow before he got any N on it. Sure he lost a few bu of corn to the yellow corn.
I think by far the best is to put 20-40 or so lbs down before or during planting, and follow up with the rest when the corn is knee high. You can probably cut back a little with the split application, and if corn looks poor or looks really good can adjust your rate to make best use of the proper amount of N. both saves some N, and puts more of it available when needed by the corn.
The negatives is using 2 trips which is time and money, and running over some corn as you sidedress.
I believe some obstructive regulations are coming sooner than later where we all will be starving our corn for N, and will need to learn to spoon feed what ever amount we are allowed to apply.
Its good to learn now. I had a 3 acre field didnt get any urea nor planter starter, had the neighbor run liquid on it when he did his. See how that shows up, good experiment. Mine looked as yellow as the neighbors did on that 3 acres.
Depends a lot if corn on corn, or corn on beans. You get that 30-40 lb boost from bean stubble, N is so very critical with corn on corn. The old cornstalks are burning up your N trying to decompose, starves the new crop of corn terribly even if you think you have enough N in the ground. My neighbor is on his second year of 100% corn on corn, it is a learning experience. I run 2/3 corn, 1/3 beans, so I can rotate things around a little, but still have to play with the corn on corn issues.
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