Quantification of Persistence of Escherichia coli O157:H7 in Contrasting Soils
Table 2
Numerical analysis of DGGE bands from growth chamber soil samples with Shannon index of diversity ().
Treatment
Week 1
Week 3
Week 4
Week 5
Week 7
CB 0.5X+
1.34 abc
0.88 a
1.03 a
0.13 a
0.58 abc
CB 0.5X
0.88abcd
0.66 a
0.30 a
0.53 a
0.91 a
CB 1.0X+
1.56 a
0.55 a
0.65 a
0.37 a
0.70 ab
CB 1.0X
1.27 abc
0.33 a
0.82 a
0.71 a
0.30 bc
CI 0.5X +E
1.12 abc
0.95 a
0.85 a
0.38 a
0.70 ab
CI 0.5X
1.22 abc
0.72 a
0.94 a
0.86 a
0.96 a
CI 1.0X+E
1.48ab
0.68 a
0.79 a
0.67 a
0.78 ab
CI 1.0X
1.45 ab
0.57 a
0.42 a
0.89 a
0.79 ab
CO 0+
1.10 abcd
0.76 a
0.89 a
0.78 a
0.82 ab
SB 0.5X+
0.82 abcd
0.96 a
0.49 a
0.39 a
0.001 c
SB 0.5X
0.45 bcd
0.98 a
0.35 a
0.47 a
0.58 abc
SB 1.0X+
0.30 cd
0.75 a
0.55 a
0.51 a
0.001 c
SB 1.0X
0.27 cd
1.04 a
0.57 a
0.29 a
0.64 ab
SI 0.5X +
0.79 abcd
1.20 a
0.76 a
0.90 a
0.59 ab
SI 0.5X
0.49 abcd
0.74 a
0.63 a
0.26 a
0.30 bc
SI 1.0X+
0.75 abcd
0.87 a
0.30 a
0.57 a
0.83 ab
SI 1.0X
0.001 d
0.73 a
0.49 a
0.72 a
0.45 abc
SO 0+
1.11 abc
0.89 a
0.52 a
0.38 a
0.38 abc
SO 0
0.95abcd
0.75 a
0.61 a
0.59 a
0.59 ab
Means with different letters within each column are significantly different at using Tukey’s Studentized Range Test. C clay soil; B methyl bromide, I methyl Iodide; S sandy soil; 0.5X, and 1X represents half agricultural application rate and recommended agricultural application rate. + E = E. coli O157:H7 applied to the samples and – E not applied to the sample.
