Saturated and unsaturated transport of cow manure-borne Escherichia coli through in situ clay loam lysimeters

Persistence and Leaching Potential of Microorganisms and Mineral N in Animal Manure Applied to Intact Soil Columns

“…The relatively low incubation temperature of 10°C in our experiment may thus have increased the survival and leaching of the organisms investigated. Nevertheless, the leaching of bacteria in the current study was low compared to that in other studies where slurry samples or microorganisms in irrigating water were applied to wet soil and/or where irrigation was applied instantly (64,65,66). In the present study, slurry was applied to soil at field capacity, which is normal agricultural practice.…”

Bacterial filtration rates in repacked and weathered soil columns

“…Roodsari et al (2005) while studying the effects of a vegetated filter on the transport of fecal coliform (FC) bacteria also reported a decrease in concentrations of FC with soil depth. Mosaddeghi et al (2010) reported a greater concentration of E. coli at depth of 20 cm than of 40 cm in lysimeters of a clay loam soil. For the repacked columns (R), the recovery of E. coli NAR and Br were greater for the sandy loam soil versus the clay loam soil; averaged over the three depths, the mean cumulative recovery under the unsaturated flow was greater by 1.6% ( In contrast to the repacked soil columns for the PBW columns more E. coli NAR and Br leached from the clay loam soil.…”

“…Gannon et al, 1991;Smith et al, 1985) even though both the pore size distribution and pore continuity are altered. The use of intact field soil columns has also been reported (Dousset et al, 2007;Jiang et al, 2005;McLeod et al, 2003;Mosaddeghi et al, 2010). However even these relatively undisturbed columns may produce ambiguous results (Dousset et al, 1995) due to possible changes in soil structure during sampling.…”

“…Solution samplers were installed at depths of 15 and 30 cm before repacking the soil similar to Mosaddeghi et al (2010). However in order to minimize changes in the soil water content around the sampler during vacuum application we manufactured a solution sampler from a plastic micro pump tube with the internal diameter of 1 mm.…”

Impact of calcium carbonate and temperature on survival of Escherichia coli in soil

“…Jiang et al (2005Jiang et al ( , 2006 noted that bacteria retention occurred mostly in the top layer of a sand column (top 0.1 m for their case study). The main retention mechanisms are physical straining or filtration within the pores of the solid matrix (Tan et al, 1992;Wan et al, 1994;Wan and Tokunaga, 1997;Schäfer et al, 1998;Mosaddeghi et al, 2009Mosaddeghi et al, , 2010. Depending on its physiological state a bacterial cell may attach to surfaces where it may grow or can be dislodged into the aqueous solution and transported to new regions.…”