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Managing natural processes in drainage ditches for nonpoint source nitrogen control

Jeffrey S. Strock, Curtis J. Dell and John P. Schmidt
Journal of Soil and Water Conservation July 2007, 62 (4) 188-196;
Jeffrey S. Strock
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Curtis J. Dell
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John P. Schmidt
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Abstract:

In watersheds dominated by agriculture, artificial drainage systems can efficiently and quickly transport excess water from agricultural soils. The application of more nitrogen (N) than a crop uses creates a surplus in the soil and increases the risk of N loss to the environment. We examine issues associated with agricultural N use, N transfer from artificially drained agricultural land to drainage ditches, N cycling within ditches, and options for management. Watercourses in agricultural watersheds often have high concentrations of N and are effectively N saturated. Numerous processes are involved in N cycling dynamics and transport pathways in aquatic ecosystems including N mineralization, nitrification, and denitrification. Flow control structures can lower N losses related to artificial drainage by increasing water retention time and allowing greater N removal. An ongoing study in Minnesota compares the impact of flow control structures on N losses from paired ditches with and without flow control. During the first year of observation, results were mixed, with lower N concentrations in nonstorm event samples from the ditch with the flow control structure, but no significant difference in annual total N load between the two ditches. Appropriate management of drainage ditches represents a potential opportunity to remove biologically available forms of N from drainage water through a combination of physical and biogeochemical processes.

Footnotes

  • Jeffrey S. Strock is an associate professor at the Southwest Research and Outreach Center, University of Minnesota, Lamberton, Minnesota. Curtis J. Dell and John P. Schmidt are soil scientists at the Pasture Systems and Watershed Management Research Unit, USDA Agricultural Research Service, University Park, Pennsylvania.

  • Copyright 2007 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 62 (4)
Journal of Soil and Water Conservation
Vol. 62, Issue 4
July/August 2007
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Managing natural processes in drainage ditches for nonpoint source nitrogen control
Jeffrey S. Strock, Curtis J. Dell, John P. Schmidt
Journal of Soil and Water Conservation Jul 2007, 62 (4) 188-196;

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Managing natural processes in drainage ditches for nonpoint source nitrogen control
Jeffrey S. Strock, Curtis J. Dell, John P. Schmidt
Journal of Soil and Water Conservation Jul 2007, 62 (4) 188-196;
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