Table 3.

Two-factor ANOVA based on soil types and pollution treatments.

	NNRs at 56 days			AOA amoA at 56 days			AOB amoA at 56 days
Factor	df	F	p	df	F	p	df	F	p
Soil types	3	150.868	<0.01**	3	1475.664	<0.01**	3	1396.397	<0.01**
Contamination treatments	5	2.59	<0.05*	5	30.385	<0.01**	5	124.521	<0.01**
Soil types and contamination treatments	15	1.795	<0.05*	15	11.829	<0.01**	15	7.697	<0.01**

^*represents significance at p < 0.05.

^**extremely indicates significance at p < 0.01.

df, degrees of freedom.