Influence of nitrapyrin on N₂O losses from soil receiving fall-applied anhydrous ammonia
2010
Parkin, T.B. | Hatfield, J.L.
Fertilizer application in crop production agriculture has been identified as a major source of the greenhouse gas nitrous oxide. Thus, management strategies that increase fertilizer N use efficiency will reduce N₂O emission. Anhydrous ammonia applied to cropland in the fall is recognized as a management practice that increases the risk of N loss from the rooting zone, however, this practice is still common in the U.S. Midwest Corn Belt. The nitrification inhibitor, nitrapyrin has been shown to decrease soil N losses during the fall and spring, and maintain fertilizer N availability to the crop. Additionally, nitrification inhibitors have shown promise in reducing soil N₂O emissions. However, there have been no studies evaluating the effectiveness of nitrapyrin to reduce annual N₂O emissions from land receiving fall-applied anhydrous ammonia. This study was conducted over 2 years to measure N₂O emissions from corn plots with fall-applied anhydrous ammonia with and without nitrapyrin. Based on soil NO₃ and NH₄ analyses, we observed that nitrapyrin delayed nitrification, and in 1 year, reduced late fall/early spring N₂O emission. However, annual N₂O emissions were not significantly reduced. Significantly higher corn grain yields were observed in the nitrapyrin treatment in both years.
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