If you are considering fall application of anhydrous ammonia to corn fields (the only nitrogen fertilizer recommended for fall application), remember to wait until soil temperatures cool to 50° F and continue to trend colder. The same guidance applies to manure with high ammonium N content, like liquid swine manure.
Iowa State University
Sawyer, John E., "Fall Nitrogen Applications and Soil Temperature" (2014). Integrated Crop Management News. 873.
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