With the early harvest, Iowa’s conservation leaders are encouraging farmers to wait until soil temperatures lower before applying anhydrous ammonia (NH3) this fall. Anhydrous ammonia applied before daily soil temperatures remain below 50 degrees Fahrenheit and continue trending lower can result in the nitrogen loss that can impact crop development and have negative environmental impacts, such as enhanced leaching into groundwater and streams once converted to nitrate.
Iowa State University
Sawyer, John E.; Stewart, Barbara; and Ehm, William, "Wait Until Soil Temps Drop Before Applying Anhydrous Ammonia" (2010). Integrated Crop Management News. 368.
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