Soil temperature has been the primary criterion for evaluating risks associated with losses of fall-applied nitrogen (N). The basic idea is that ammonium is not converted to nitrate in cold soils, so withholding applications until soils are cold reduces the risk of N losses by leaching and denitrification when soils have excess water in the spring. Recent studies indicate that soil pH also deserves attention.
Iowa State University
Blackmer, Alfred M.; Kyveryga, Petro M.; and Isla, Ramon, "Soil pH and losses of fall-applied ammonia" (2000). Integrated Crop Management News. 2060.
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