Recent heavy rains are causing N shortages in emerging crops. In the Valley, these areas will tend to be in depressions where crops have, or will be replanted. In the interbeach area, low N may be found in both depressions and sandy ridges. In the till plain and western North Dakota, low N may be found on hill tops and long slopes.
Ammonium nitrate is the least volatile option.
The N in ammonium sulfate can be volatile if soil Ph is high. Both of these options are more expensive than urea and may not be readily available in most areas. Urea is stocked most everywhere. Application timing is critical because it requires rain with in about 48 hours to avoid significant losses. It should be cut half and half with water.