Table 5: Multifactor analysis of statistical differences in P, Cu, and Zn concentrations as affected by soil types, sewage source, mixing rate, and incubation time.

SourceSoilsSewagesRatesIncubation periodsAmendmentsSoils*sewages*rates*incubation periods*amendments

PDF111188
ratio949.088.233.7910.37620.573.39
Prob > <0.01*0.04*0.050.01*<0.01*0.01*

ZnDF111188
ratio278.4990.993.49216.33894.801.15
Prob > <0.01*<0.01*0.06<0.01*<0.01*0.32

CuDF111188
ratio1.231.011.010.960.990.99
Prob > 0.260.310.310.320.430.43