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Research ArticleResearch Section

Field evaluation of vegetative filter effectiveness and runoff quality from unstocked feedlots

K.R. Mankin, P.L. Barnes, J.P. Harner, P.K. Kalita and J.E. Boyer
Journal of Soil and Water Conservation July 2006, 61 (4) 209-217;
K.R. Mankin
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P.L. Barnes
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J.P. Harner
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P.K. Kalita
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J.E. Boyer
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ABSTRACT:

Smaller beef cattle feedlots—less than 1,000 head—are often used for only a part of each year, but little is known about the pollution potential caused by feedlot residual manure when cattle are not present or about the effectiveness of vegetative filter strips under these conditions. This study quantified beef cattle feedlot runoff quality, particularly during unstocked conditions, evaluated reductions of fecal bacteria and nutrients in vegetative filter strips treating feedlot runoff, and assessed the relative importance of site characteristics on observed reductions. Established vegetative filter strips on four commercial feedlots located across central and eastern Kansas were instrumented with automated samplers at vegetative filter strip inlets and outlets, and 22 feedlot runoff events were analyzed for reductions in fecal coliform, Escherichia coli, fecal streptococci, total nitrogen and total phosphorus. Events when few or no cattle were present averaged one-sixth the total nitrogen (20 mg L−1), one-seventh the total phosphorus (6 mg L−1), and one-fortieth the fecal coliforms (2.1 × 104 cfu 100 mL−1) of events with cattle present. Measured concentration reductions from all events and vegetative filter strips averaged 77 percent (fecal coliforms), 83 percent (E. coli), 83 percent (fecal streptococci), 66 percent (total nitrogen), and 66 percent (total phosphorus). Vegetative filter strips allowed no discharges for 92 and 93 percent of feedlot runoff events at the sites with the ratio of vegetative filter strip:drainage area greater than 0.5. Constituent reductions were positively correlated to vegetative filter strip:drainage area ratio and negatively correlated to event rainfall depth. This study provides general support for the use of vegetative filter strip:drainage area ratio as a design guideline.

Footnotes

  • Kyle R. Mankin is an associate professor, Philip L. Barnes is an associate professor, and Joseph P. Harner is a professor in the Biological and Agricultural Engineering Department at Kansas State University, Manhattan, Kansas. Prasanta K. Kalita is an associate professor in the Agricultural and Biological Engineering Department at the University of Illinois, Urbana-Champaign, Illinois. John E. Boyer, Jr. is a professor and head of the Statistics Department at Kansas State University, Manhattan, Kansas.

  • Copyright 2006 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 61 (4)
Journal of Soil and Water Conservation
Vol. 61, Issue 4
July/August 2006
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Field evaluation of vegetative filter effectiveness and runoff quality from unstocked feedlots
K.R. Mankin, P.L. Barnes, J.P. Harner, P.K. Kalita, J.E. Boyer
Journal of Soil and Water Conservation Jul 2006, 61 (4) 209-217;

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Field evaluation of vegetative filter effectiveness and runoff quality from unstocked feedlots
K.R. Mankin, P.L. Barnes, J.P. Harner, P.K. Kalita, J.E. Boyer
Journal of Soil and Water Conservation Jul 2006, 61 (4) 209-217;
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