The multivariate analysis showed that both soil type (p= 0.0127)
and organic fertilizer (p= 0.0012) significantly affected E. coli
O157:H7 survival in fertilizer-amended soils. However, the
organic fertilizer application played a more important role in
regulating E. coli O157:H7 survival than soil type. Generally,
E. coli O157:H7 survived significantly longer in fertilizeramended soils (17.55±6.42 days,p< 0.05) than in original soils
(11.48±5.15days). Stepwise multiple regression analysis for the
20 fertilizer-amended soils displayed that soil pH and EC had a
profound influence on thetd values (Table 3), which was confirmed by hierarchical partitioning analysis (Fig. 3). Path analysis
also revealed that soil pH, EC and NO3
−
-N content had higher direct
effects than their indirect effects on thetdvalues; however, the
indirect effect (DC =−0.533) of WSOC via EC was higher than that
of the direct effect (DC = 0.433) on thetdvalues (Table 4).
The multivariate analysis showed that both soil type (p= 0.0127)and organic fertilizer (p= 0.0012) significantly affected E. coliO157:H7 survival in fertilizer-amended soils. However, theorganic fertilizer application played a more important role inregulating E. coli O157:H7 survival than soil type. Generally,E. coli O157:H7 survived significantly longer in fertilizeramended soils (17.55±6.42 days,p< 0.05) than in original soils(11.48±5.15days). Stepwise multiple regression analysis for the20 fertilizer-amended soils displayed that soil pH and EC had aprofound influence on thetd values (Table 3), which was confirmed by hierarchical partitioning analysis (Fig. 3). Path analysisalso revealed that soil pH, EC and NO3−-N content had higher directeffects than their indirect effects on thetdvalues; however, theindirect effect (DC =−0.533) of WSOC via EC was higher than thatof the direct effect (DC = 0.433) on thetdvalues (Table 4).
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