Mounting evidence indicates that fall-applied nitrogen (N) is converted to nitrate much more rapidly than has been generally believed in Iowa. Observations made last December add to this evidence. Soil samples were collected in mid-December from three fields that received anhydrous ammonia in mid-November. The fields were in Greene County, and soil samples were collected from a total of 25 test areas within the fields. The test areas were selected to represent the range in soil characteristics within each field. Samples were collected to a depth of 18 inches in and between injection bands within each test area.
Iowa State University
Blackmer, Alfred Merrill and Kyveryga, Petro M., "Fall nitrification happened" (2002). Integrated Crop Management News. 1794.
The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.