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Effectiveness of Vegetated Buffer Strips in Controlling Pollution from Feedlot Runoff¹

ABSTRACT

A rainulator was used to test vegetative buffer strips for their ability to control pollution from feedlot runoff. Cropped buffer strips on a 4% slope reduced runoff and total solids transported from a feedlot by 67 and 79%, respectively. Total N and P were reduced by an average of 84 and 83%, respectively. Ammonium-N and PO₄-P were similarly reduced, but average NO₃-N in the runoff increased because some NO₃-N was gained from the sorghum (Sorghum vulgare L.)-sudangrass (Sorghum sudanense L.) and the oat (Avena sativa L.) buffer strips. During both years, the number of coliform organisms in the runoff water was reduced after runoff passed through the vegetated buffer strips. These results indicated that nonstructural feedlot discharge control practices are a promising alternative method for controlling pollution from feedlot runoff.

Key Words: runoff filter strips • vegetated filters • livestock waste • rainulator

¹ Contribution from the North Central Soil Conserv. Res. Lab., Sci. and Educ. Admin., Agric. Res., USDA, Morris, Minn., in cooperation with the Minn. Pollut. Control Agency and the Minn. Agric. Exp. Station, Sci. Journal Series 10,851.

² Agricultural Engineer, USDA, Morris, Minn. and Asst. Professor, Univ. of Minn., St. Paul, Minn.; Consulting Engineer, Tolz, King, Duvall, Anderson & Assoc., Inc., St. Paul, Minn.; and Head, Agric. Unit. Div. of Water Quality, Minn. Pollution Control Agency, Roseville, Minn., respectively. T. Huntrods was formerly Chief of Section of Agric. Waste, Minn. Pollution Control Agency, Roseville, Minn.

Received for publication October 9, 1979.

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