Table 4. Correlation coefficients (r) between soil microbial and physical-chemical factors.

Soil factor	Sand	Silt	Clay	BD	WHC	Porosity	pH	SOC	TN	TP	TK	NH4 +-N	NO3 –N	AP	AK	Ca	Mg	Na	Invertase	ACP	Catalase	Urease	Cmic	BR
Silt	−0.443
Clay	−0.540	−0.516
BD	−0.845	0.682	0.167
WHC	−0.115	−0.661	0.730	−0.046
Porosity	0.689	0.159	−0.808	−0.566	−0.454
pH	−0.520	0.498	0.029	0.736	0.299	−0.184
SOC	0.473	−0.065	−0.390	−0.059	−0.219	−0.030	−0.198
TN	0.512	0.217	−0.693	−0.060	−0.547	0.255	−0.206	0.922
TP	0.409	0.338	−0.708	0.041	−0.630	0.230	−0.167	0.882	0.990
TK	0.318	−0.853	0.497	−0.687	0.672	0.068	−0.328	−0.418	−0.593	−0.694
NH4 +−N	0.607	−0.026	−0.555	−0.665	−0.701	0.651	−0.807	0.141	0.372	0.368	0.022
NO3 –N	−0.943	0.231	0.684	0.701	0.383	−0.654	0.564	−0.650	−0.741	−0.669	−0.019	−0.706
AP	0.401	0.384	−0.743	0.056	−0.658	0.266	−0.139	0.856	0.984	0.998	−0.715	0.375	−0.662
AK	0.864	−0.762	−0.110	−0.877	0.098	0.290	−0.753	0.478	0.367	0.253	0.510	0.533	−0.795	0.218
Ca	0.313	0.371	−0.648	0.173	−0.541	0.124	−0.021	0.898	0.973	0.985	−0.742	0.203	−0.569	0.983	0.158
Mg	0.308	0.198	−0.481	0.203	−0.228	−0.015	0.139	0.936	0.901	0.884	−0.605	−0.064	−0.495	0.873	0.190	0.941
Na	−0.789	0.866	−0.059	0.816	−0.316	−0.142	0.640	−0.454	−0.265	−0.138	−0.601	−0.330	0.676	−0.097	−0.973	−0.073	−0.180
Invertase	0.185	0.066	−0.240	0.240	−0.128	−0.263	0.042	0.934	0.821	0.805	−0.543	−0.129	−0.377	0.780	0.216	0.868	0.943	−0.232
ACP	0.558	−0.109	−0.431	−0.105	0.074	0.172	0.140	0.808	0.725	0.654	−0.204	−0.094	−0.595	0.642	0.406	0.701	0.848	−0.437	0.734
Catalase	−0.567	−0.179	0.709	0.308	0.774	−0.421	0.570	−0.694	−0.864	−0.869	0.454	−0.759	0.802	−0.867	−0.467	−0.774	−0.570	0.289	−0.513	−0.350
Urease	−0.275	−0.165	0.417	0.162	0.770	−0.105	0.672	−0.575	−0.700	−0.733	0.471	−0.712	0.547	−0.721	−0.347	−0.640	−0.404	0.180	−0.457	−0.095	0.901
Cmic	0.833	−0.492	−0.334	−0.652	−0.151	0.255	−0.667	0.786	0.716	0.628	0.109	0.536	−0.892	0.595	0.907	0.554	0.552	−0.849	0.557	0.611	−0.727	−0.590
BR	0.478	−0.165	−0.302	−0.070	−0.055	−0.078	−0.128	0.982	0.855	0.798	−0.315	0.022	−0.609	0.768	0.499	0.830	0.925	−0.511	0.934	0.848	−0.577	−0.440	0.773
Nmic	0.756	−0.885	0.109	−0.869	0.416	0.241	−0.560	0.194	0.029	−0.100	0.768	0.294	−0.567	−0.133	0.897	−0.170	−0.054	−0.934	−0.021	0.274	−0.105	0.042	0.674	0.266

In bold, significant values at the 0.05 level. BD, bulk density; WHC, water holding capacity; SOC, soil organic carbon; TN, total nitrogen; TP, total phosphorous; TK, total kalium; AP, available phosphorous; AK, available kalium; ACP, acid phosphatase; Cmic, microbial biomass carbon; BR, basal respiration; Nmic, microbial biomass nitrogen.