Microbial activities in soil cultivated with corn and amended with sewage sludge

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Table 4 Correlations coefficients between some microbial and chemical factors

	C_mic	N_mic	BR	FDA	qCO₂	C_org	C_mic:C_org	N_mic:N_tot	Cu	Cr	Ni	Zn	N_tot	K	P
N_mic	0.33
BR	0.76**	0.19
FDA	0.29	0.45	0.55*
qCO₂	0.1	0.04	0.71**	0.59*
C_org	0.54*	0.27	0.88***	0.77***	0.77***
C_mic:C_org	0.82***	0.16	0.31	−0.19	−0.38	−0.03
N_mic:N_tot	−0.06	0.79***	−0.36	−0.06	−0.4	−0.33	0.11
Cu	0.39	0.51	0.7**	0.82***	0.67**	0.9***	−0.16	−0.06
Cr	0.64*	0.57*	0.78***	0.76**	0.53*	0.82***	0.19	−0.04	0.87***
Ni	0.64*	0.6*	0.77***	0.74**	0.52*	0.78***	0.22	0.03	0.77***	0.94***
Zn	0.49	0.32	0.83***	0.8***	0.75**	0.97***	−0.08	−0.3	0.94***	0.86***	0.8***
N_tot	0.77***	0.28	0.89***	0.49	0.49	0.79***	0.37	−0.25	0.69**	0.77***	0.71**	0.75**
K	−0.36	−0.61*	−0.35	−0.66**	−0.17	−0.4	−0.13	−0.22	−0.52*	−0.72**	−0.68**	−0.44	−0.52*
P_av	0.59*	0.31	0.89***	0.78***	0.72**	0.98***	0.04	−0.29	0.87***	0.84***	0.81***	0.96***	0.79***	−0.47
pH	−0.01	−0.37	−0.23	−0.66**	−0.39	−0.5	0.35	−0.09	−0.49	−0.39	−0.4	−0.48	−0.25	0.53*	−0.49

BR, basic respiration; FDA, fluorescein diacetate activity; qCO₂, metabolic quotient
* p < 0.05; ** p < 0.01; *** p < 0.001