Influence of Stabilized Biosolids Application on Availability of Phosphorus, Copper, and Zinc

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.

	Source	Soils	Sewages	Rates	Incubation periods	Amendments	Soils^*sewages^*rates^*incubation periods^*amendments
P	DF	1	1	1	1	8	8
	𝐹 ratio	949.08	8.23	3.79	10.37	620.57	3.39
	Prob > 𝐹	<0.01^*	0.04^*	0.05	0.01^*	<0.01^*	0.01^*
Zn	DF	1	1	1	1	8	8
	𝐹 ratio	278.49	90.99	3.49	216.33	894.80	1.15
	Prob > 𝐹	<0.01^*	<0.01^*	0.06	<0.01^*	<0.01^*	0.32
Cu	DF	1	1	1	1	8	8
	𝐹 ratio	1.23	1.01	1.01	0.96	0.99	0.99
	Prob > 𝐹	0.26	0.31	0.31	0.32	0.43	0.43