title: [Soil texture as a regulating factor of Escherichia coli adsorption in a Rolling Pampa basin (Argentina)].
abstract: Increase of bovine livestock rates in fragile areas of the Rolling Pampa entails a high risk of biological contamination. This biological contamination is regulated by edaphic variables such as texture, which control biological contaminants transport towards water bodies. In this work bacterial adsorption was correlated with individual particle sizes in 27 soils of a typical basin of the Rolling Pampa with slow centrifugation techniques. Bacterial adsorption values, using E. coli (ATCC 8739), ranged between 25.3 and 73.3% and significant correlation (R² = 0.6) was found between bacterial adsorption and clay content. This correlation was improved when particles smaller than 3 µm were considered (R² = 0.64) highlighting the capacity of very fine silt in adsorption mechanisms. Data obtained were compared with those proposed by Ling et al. (2002), finding similar slope but different intercept. This difference disappeared when a wild strain, isolated from bovine manures present in the basin, was used, since a bacterial adsorption increase of 48% was found.
authors: Cátedra de Manejo y Conservación de Suelos, Facultad de Agronomía, Universidad de Buenos Aires. filipebk@agro.uba.ar
authors: Filipe
authors: F
authors: Behrends Kraemer
authors: Celio I
authors: CI
authors: Chagas
authors: Diego J
authors: DJ
authors: Cosentino
authors: Marta
authors: M
authors: Paz
authors: Juan A
authors: JA
authors: Moretton
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates; D000818:Animals; D001118:Argentina; D002417:Cattle / Q000382:microbiology; D000077215:Clay; D004926:Escherichia coli / Q000502:physiology*; D005243:Feces / Q000382:microbiology; D010316:Particle Size; D012822:Silicon Dioxide; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D013045:Species Specificity; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D012987:Soil; D012822:Silicon Dioxide; D000077215:Clay