Persistence of Pathogenic and Non-Pathogenic Escherichia coli Strains in Various Tropical Agricultural Soils of India
Fig 6
PCA biplot showing orthogonal positions of soils and cocopeat and assessed soil variables and survival modeling parameters of three E. coli strains.
A—DH5α; B—MTCC433; C- O157-TNAU. S1—Wetland soil; S2—Red lateritic soil; S3—Black cotton soil; S4—Tropical latosol; S5—Cocopeat. Soil variables: pH; EC, electrical conductivity; N, P, K, available nutrients; SOC, soil organic carbon; MBC, microbial biomass carbon; DHA, dehydrogenase; TCB, total culturable bacterial count. E. coli survival parameters: %R, population decline per cent; MP, mean population reduction rate; DR, Decimal reduction rate. Survival modeling parameters: t4D, time (days) to attain a 4 log reduction; δ1, time (days) for first decimal reduction of subpopulation 1; δ2, time (days) for first decimal reduction of subpopulation 2; ttd, time to reach the detection limit.