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  • Title: Survival of faecal indicator bacteria in bovine manure incorporated into soil.
    Author: Lau MM, Ingham SC.
    Journal: Lett Appl Microbiol; 2001 Aug; 33(2):131-6. PubMed ID: 11472521.
    Abstract:
    AIMS: Survival of Escherichia coli and enterococci was evaluated in bovine manure incorporated into two Wisconsin soils. METHODS AND RESULTS: Silty clay loam (SCL) and loamy sand (LS) were mixed with fresh bovine manure, exposed daily to 10 h at 22 degrees C/14 h at 9 degrees C, and watered weekly for 12 weeks. Escherichia coli numbers increased 1-2 log cfu g(-1), then decreased < 1 and about 2 log cfu g(-1) in SCL and LS, respectively. Enterococci numbers rose less and then declined faster than those of E. coli. Watering intervals of 3, 7 and 14 days were evaluated in weeks 13-19, but did not affect the slow decline in numbers of E. coli or enterococci. CONCLUSION: Escherichia coli and enterococci may survive at least 19 weeks at 9-21 degrees C in bovine manure/soil, with E. coli surviving better. SIGNIFICANCE AND IMPACT OF THE STUDY: Quantification of E. coli or enterococci in late spring/early summer soil may be useful in indicating recent application of bovine manure.
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