The impact of agricultural soil usage on activity and abundance of ammonifying bacteria in selected soils from Poland

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Table 3 Correlations among investigated factors determined for agricultural (n = 30) and control soils (n = 30)

	pH	TC	POXC	NO₃-N	NO₂-N	NH₄-N	AA	AB
Agricultural soil
Moisture	0.788***	0.542**	0.606***	0.381*	ns	ns	ns	0.570**
pH		0.540*	0.657	ns	ns	ns	0.520***	0.746***
TC			0.702***	ns	ns	ns	0.391***	0.488***
POXC				0.388*	ns	ns	ns	0.517**
NO₃-N					0.921***	0.574***	ns	ns
NO₂-N						0.486**	ns	0.376*
NH₄-N							0.451*	ns
AA								0.833***
Control soil
Moisture	0.563**	0.396*	ns	ns	0.508**	ns	0.537*	ns
pH		0.748***	0.830***	ns	0.741***	0.362*	ns	ns
TC			0.948***	ns	0.936***	0.557**	ns	ns
POXC				ns	0.894***	0.649***	ns	0.437*
NO₃-N					ns	0.547**	0.432*	0.431*
NO₂-N						0.543*	ns	ns
NH₄-N							0.811***	0.847***
AA								0.954***

ns no significance, TC total carbon, POXC permanganate oxidizable carbon, AA arginine ammonification, AB most probable number of ammonifying bacteria
* p < 0.05; ** p < 0.01; *** p < 0.001