<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: qdmwrks</div><div class="ubbcode-body">dbltree,
I remember reading that urea should be tilled in or spread before a rain so the N is not lost into the air. Is that only for urea? Would it apply to something like 25-10-10 in a bag from the coop? </div></div>
In most cases where the N is in urea form it would always need to be tilled in or "rained" in within 24 hours.
It doesn't matter if it's 19-19-19, 6-24-24, 10-10-10 etc, etc. the nitrogen in any dry fertlizer should be incorporated or expect large losses.
The P&K is not a problem left on the surface.
Nitrogen in the form of ammonium nitrate is more stable then urea but it's much more difficult to get now days.