title: Fate of Escherichia coli O157: H7 in agricultural soils amended with different organic fertilizers.
abstract: Five organic fertilizers (vermicompost, pig manure, chicken manure, peat and oil residue) were applied to agricultural soils to study their effects on the survival of Escherichia coli O157:H7 (E. coli O157:H7). Results showed that E. coli O157:H7 survival changed greatly after organic fertilizers application, with shorter td values (survival time needed to reach the detection limit of 100 CFU g(-1)) (12.57±6.57 days) in soils amended with chicken manure and the longest (25.65±7.12 days) in soils amended with pig manure. Soil pH, EC and free Fe/Al (hydro) oxides were significant explanatory factors for E. coli O157:H7 survival in the original soils. Soil constituents (minerals and organic matter) and changes in their surface charges with pH increased the effect of soil pH on E. coli O157:H7 survival. However, electrical conductivity played a more important role in regulating E. coli O157:H7 survival in fertilizer-amended soils. This study highlighted the importance of choosing appropriate organic fertilizers in the preharvest environment to reduce food-borne bacterial contamination.
authors.affiliation: Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Yao
authors.affiliation: Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China.
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China. Electronic address: mywhz@163.com.
authors.forename: Haizhen
authors.initials: H
authors.lastname: Wang
authors.affiliation: Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Wu
authors.affiliation: Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China. Electronic address: jmxu@zju.edu.cn.
authors.forename: Jianming
authors.initials: J
authors.lastname: Xu
mesh_terms: D000383:Agriculture / Q000379:methods*; D000704:Analysis of Variance; D015169:Colony Count, Microbial; D004784:Environmental Monitoring; D019453:Escherichia coli O157 / Q000254:growth & development*; D005308:Fertilizers / Q000032:analysis; D008954:Models, Biological; D012044:Regression Analysis; D012987:Soil / Q000737:chemistry* / Q000592:standards; D012988:Soil Microbiology / Q000592:standards*
chemical_list: D005308:Fertilizers; D012987:Soil
keywords: Agricultural soils; Escherichia coli O157:H7; Organic fertilizer; Survival