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Applied and Environmental Microbiology, May 2007, p. 3363-3370, Vol. 73, No. 10
0099-2240/07/$08.00+0     doi:10.1128/AEM.02434-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Effect of Bovine Manure on Fecal Coliform Attachment to Soil and Soil Particles of Different Sizes{triangledown}

Andrey K. Guber,1,2* Yakov A. Pachepsky,2 Daniel R. Shelton,2 and Olivia Yu2

Department of Environmental Sciences, University of California, Riverside, California,1 USDA-ARS Environmental Microbial Safety Laboratory, Beltsville, Maryland2

Received 17 October 2006/ Accepted 7 March 2007

Manure-borne bacteria can be transported in runoff as free cells, cells attached to soil particles, and cells attached to manure particles. The objectives of this work were to compare the attachment of fecal coliforms (FC) to different soils and soil fractions and to assess the effect of bovine manure on FC attachment to soil and soil fractions. Three sand fractions of different sizes, the silt fraction, and the clay fraction of loam and sandy clay loam soils were separated and used along with soil samples in batch attachment experiments with water-FC suspensions and water-manure-FC suspensions. In the absence of manure colloids, bacterial attachment to soil, silt, and clay particles was much higher than the attachment to sand particles having no organic coating. The attachment to the coated sand particles was similar to the attachment to silt and clay. Manure colloids in suspensions decreased bacterial attachment to soils, clay and silt fractions, and coated sand fractions, but did not decrease the attachment to sand fractions without the coating. The low attachment of bacteria to silt and clay particles in the presence of manure colloids may cause predominantly free-cell transport of manure-borne FC in runoff.

* Corresponding author. Mailing address: A135 Bourns Hall, Department of Environmental Sciences, University of California, Riverside, CA 92521. Phone: (301) 504-5656. Fax: (301) 504-6608. E-mail: aguber{at}anri.barc.usda.gov

{triangledown} Published ahead of print on 16 March 2007.

Applied and Environmental Microbiology, May 2007, p. 3363-3370, Vol. 73, No. 10
0099-2240/07/$08.00+0     doi:10.1128/AEM.02434-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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