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Managing natural processes in drainage ditches for nonpoint source phosphorus control

Andrew N. Sharpley, Tore Krogstad, Peter J. A. Kleinman and Brian Haggard
Journal of Soil and Water Conservation July 2007, 62 (4) 197-206;
Andrew N. Sharpley
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Tore Krogstad
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Peter J. A. Kleinman
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Brian Haggard
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Abstract:

Drainage ditches are an integral part of agricultural landscapes in many areas. We evaluated the effect of physical, chemical, and biological properties of three sources of ditch sediments on phosphorus (P) transport in the ditches. Using an indoor “fluvarium,” we found that sediments from ditches draining agricultural areas maintained an appreciably higher dissolved reactive P (DRP) concentration in flowing water (0.374 mg L−1 [0.374 ppm]) than did forested sediments (0.006 mg L−1). The larger release of P from agricultural sediments reflects a greater Mehlich-3 P and equilibrium P concentration (EPC0) of these sediments. When DRP was added to ditch water (2.60 mg L−1) to simulate surface runoff from soils amended with poultry litter, water equilibrated to 0.194 mg DRP L−1 with agricultural sediments and 2.096 mg DRP L−1 with forest sediments. The larger removal of P by agricultural sediments was related to a greater P sorption maximum and clay content of those sediments. Gamma irradiation of the ditch sediments showed microbial P biomass accounted for 10% to 40% P uptake. Thus, both abiotic and biotic processes are important in drainage ditches and influence whether ditch sediments act as sources or sinks of P transported from these drained areas. Clearly, drainage ditches are reactive conduits in terms of P transport and can influence not only the amount but environmental bioavailability of P exported and thereby biological response of receiving waters.

Footnotes

  • Andrew N. Sharpley is a professor in the Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas. Tore Krogstad is a professor in the Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, Aas, Norway. Peter J.A. Kleinman is a soil scientist, Francirose Shigaki is a postdoctoral fellow, and Lou S. Saporito is a research support scientist at the Pasture Systems and Watershed Management Research Unit, USDA Agricultural Research Service, University Park, Pennsylvania. Brian Haggard is a professor in the Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, Arkansas.

  • 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 phosphorus control
Andrew N. Sharpley, Tore Krogstad, Peter J. A. Kleinman, Brian Haggard
Journal of Soil and Water Conservation Jul 2007, 62 (4) 197-206;

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Managing natural processes in drainage ditches for nonpoint source phosphorus control
Andrew N. Sharpley, Tore Krogstad, Peter J. A. Kleinman, Brian Haggard
Journal of Soil and Water Conservation Jul 2007, 62 (4) 197-206;
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