Although the equation of Bastos *et al.* (2008) was different to those reported here, there was no statistical difference (Independent-Samples T Test, *p* > 0.05; Equations (7) and (4), (7) and (5), and (7) and (6) in the predicted microbial quality of crops (Table 3) modelled using irrigation wastewater qualities of 10, 10^{2}, 10^{3} and 10^{4}*E. coli* MPN/100 mL. The *E. coli* counts on the lettuce predicted from Equations (4)–(6) were converted from *E. coli* MPN/100 g to *E. coli* MPN/g in order to be consistent with Equation (7) of Bastos *et al.* (2008).

Table 3

Wastewater qualities (E. coli MPN/100 mL)
. | Predicted bacterial quality of lettuce (E. coli MPN/g). | |||
---|---|---|---|---|

Equation (4) . | Equation (5) . | Equation (6) . | Equation (7) . | |

10 | 0.02 | 0.03 | 0.02 | 1.26 |

10^{2} | 0.26 | 0.21 | 0.14 | 8.51 |

10^{3} | 2.95 | 1.82 | 1.23 | 57.54 |

10^{4} | 33.88 | 15.48 | 10.47 | 398.05 |

Wastewater qualities (E. coli MPN/100 mL)
. | Predicted bacterial quality of lettuce (E. coli MPN/g). | |||
---|---|---|---|---|

Equation (4) . | Equation (5) . | Equation (6) . | Equation (7) . | |

10 | 0.02 | 0.03 | 0.02 | 1.26 |

10^{2} | 0.26 | 0.21 | 0.14 | 8.51 |

10^{3} | 2.95 | 1.82 | 1.23 | 57.54 |

10^{4} | 33.88 | 15.48 | 10.47 | 398.05 |

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