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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, 102, 103 and 104E. 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

The predicted E. coli concentration on lettuce irrigated with wastewater containing 10, 102, 103 and 104E. coli MPN/100 mL calculated using Equations (4)–(6) (this study) and Equation (7) (Bastos et al. 2008)

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 
102 0.26 0.21 0.14 8.51 
103 2.95 1.82 1.23 57.54 
104 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 
102 0.26 0.21 0.14 8.51 
103 2.95 1.82 1.23 57.54 
104 33.88 15.48 10.47 398.05 

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