Effects of an Experimental Nitrification Inhibitor When Used with Fall and Spring Applied Anhydrous Ammonia.

Nitrification inhibitors have been shown to improve nitrogen use efficiency and reduce nitrogen loss of fall applied anhydrous ammonia, but have had limited value in spring applications. Yield results from IL, MO and NE comparing fall and spring anhydrous ammonia application timing with and without inhibitors will be presented. In addition, the effect of an experimental inhibitor on nitrate leaching from a replicated tile drainage study conducted in IA will be presented. In a wet season, there was a significant yield increase for the inhibitors when used in both fall and spring applications. In addition, yield when anhydrous was fall applied with the inhibitor were equal to spring applications without the inhibitor. This study demonstrates that fall-anhydrous ammonia can be an efficient option for corn producers.