Originally Posted by Skipster
... Denitrification reactions are inhibited by cold temperatures in fall/winter/spring, do very little nitrate is lost.
Ammonium tends to hang around on CE sites and very little is converted to nitrate in cold weather because the weather is too cold for amped activity of those microbes. This is partially the reason that anhydrous ammonia can be used as an ag fertilizer and is applied in the cooler weather.
Once you look at the dynamics of the living world, you better understand why applications are done in a particular manner.
Does this mean that it makes sense to apply N in the winter, because most of it may stabilize in the frozen turf??? But we don't want a fresh supply of N as soon as the plants break dormancy in the Spring...
That is one of the issues of cool-season grasses having the ability to put down roots w/out the waste of topgrowth energy... anhydrous ammonia is fine for corn, but not for turf...