South and southeast Iowa have experienced much above normal precipitation and continued wet soils early this spring. See the figures below for the precipitation and departure from normal for the April 18-May 17, 2010 period. What does this mean for nitrogen (N) loss, and is this a repeat of the last two years for that area of Iowa? While it has been wet, it has also been cooler than normal (see figure below). That is important because cool temperatures slow nitrification and denitrification, both biological processes important for potential N loss. While the wet period does not bode well for retaining N, it may not be a repeat of the last two years as those were continued wet late in the spring and into early summer. Time will tell if the wet conditions persist this year and promote N loss.
Iowa State University
Sawyer, John E., "Wet Soil Conditions and Nitrogen Loss" (2010). Integrated Crop Management News. 445.
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