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.

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 ...

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 ...