John Sawyer with the Department of Agronomy at Iowa State University shares the best options for sidedressing nitrogen, in order from most to least preferable: Injected anhydrous ammonia ...

2. Ammonium sulfate, diammonium phosphate, anhydrous ammonia, aqua ammonia and urea are all suitable for fall application ahead of corn, except on poorly-drained or excessively-drained soils.

Anhydrous ammonia is one of the most widely used industrial ... Warner submitted an application for conditional use permit to allow them to sell and distribute seed, pesticides and fertilizer ...

These special considerations for your soil might make application timing trickier than using other nitrogen fertilizer options. However, if you hit the right conditions, anhydrous ammonia can help ...