58 Reducing Nitrogen Loss through Subsurface Drainage: Practices, Efficiencies and Impacts: I

Oral Session
ASA Section: Environmental Quality
Subsurface (tile) drainage systems is an important pathway for nitrogen exports from agricultural fields to surface waters. Several existing or emerging practices aiming at minimizing nitrogen exports through subsurface agricultural drainage systems are being studied and evaluated throughout the US and the world. Collectively termed conservation drainage, these practices are agronomic or engineered approaches designed to optimize the source or timing of nitrogen availability to the crop; increase plant uptake of nitrogen; reduce drainage flow volume and/or increase denitrification. Abstracts discussing aspects of the practices including their efficiencies, impacts and adoption are invited.

Approved for 2.5 SW CEUs.


Managing Denitrification in Agronomic Systems Community

Managing Denitrification in Agronomic Systems Community
Nutrients and Environmental Quality Community

Monday, November 16, 2015: 9:30 AM-12:00 PM
Minneapolis Convention Center, 102 E

Community Leader:
Jeppe H. Kjaersgaard
Jeppe H. Kjaersgaard
Gary W. Feyereisen
9:30 AM
Introductory Remarks
9:35 AM
Reactive Transport Modeling of Nitrogen Fate in a Structured Clay Loam Subject to Liquid Swine Manure Application: Implications of Tile Drainage Management.
Syed Hussain, Agriculture and Agri-Food Canada; David Lapen, Agriculture & Agri-Food Canada; Steven Frey, Aquanty; Natalie Gottschall, Agriculture & Agri-Food Canada; David Blowes, University of Waterloo; Carol Ptacek, University of Waterloo
9:50 AM
Evaluation of Drainmod Nii and SWAT in Simulating Subsurface Drainage and Nitrate Losses in Minnesota.
David J. Mulla, University of Minnesota; Grace Wilson, University of Minnesota
10:05 AM
How Efficiently Do Corn- and Soybean-Based Cropping Systems Use Water? a Systems Modeling Analysis.
Ranae Dietzel, Iowa State University; Matt Liebman, Iowa State University; Robert P. Ewing, Iowa State University; Matthew J Helmers, Iowa State University; Robert Horton, Iowa State University; Sotiris V Archontoulis, Iowa State University
10:35 AM
Using Unique Carbon Source Combinations to Increase Nitrate and Phosphate Removal Rates in Bioreactors.
Marta Roser, University of Minnesota; Gary W. Feyereisen, USDA-ARS; David Mulla, University of Minnesota; Kurt A. Spokas, USDA-ARS; Jessica Gutknecht, University of Minnesota, Twin Cities
10:50 AM
11:00 AM
Woodchip Properties after Four Years in a Denitrification Bed.
Ehsan Ghane, Michigan State University; Gary W. Feyereisen, USDA-ARS
11:15 AM
Greenhouse Gas Emissions from Two Saturated Riparian Buffers Located in Central Iowa.
Morgan P. Davis, Iowa State University; Thomas M. Isenhart, Iowa State University; Dan B. Jaynes, USDA-ARS National Laboratory for Agriculture and the Environment; Timothy Parkin, USDA-ARS National Laboratory for Agriculture and the Environment; Kirsten Hofmockel, Department of Energy; Tyler A. Groh, Iowa State University
11:30 AM
Tile Water Nitrogen Reduction in a Constructed Wetland and Wetland Mesocosms in Southern Minnesota.
Brad Gordon, University of Minnesota; Christian Lenhart, University of Minnesota; Dean A. Current, University of Minnesota; Heidi Peterson, Minnesota Department of Agriculture; Nikol Ross, Minnesota Department of Agriculture; Joshua D. Gamble, USDA-ARS
11:45 AM
Improving Denitrifying Bioreactor Performance By Adding a Post-Bed Processing Chamber.
Gary W. Feyereisen, USDA-ARS; Laura E. Christianson, The Freshwater Institute; Thomas B. Moorman, USDA-ARS; Rodney Venterea, ARS
12:00 PM