Table 2 Mixed effect model analyses testing the effects of tillage type (T), sampling depth (D), time of sampling (S) and T × S interactions on nematode feeding groups and nematode diversity indices.

Index	Tillage type (T)		Sampling depth (D)		Sampling time (S)		T x S
Index	F–ratio	P–value	F–ratio	P–value	F–ratio	P–value	F–ratio	P–value
Diversity indices
Richness	0.72	0.49	4.28	0.04	5.18	0.003	5.45	< 0.001
Shannon	0.91	0.41	5.7	0.02	12.59	< 0.0001	0.66	0.68
Simpson	0.86	0.43	3.58	0.06	10.07	< 0.0001	1.42	0.22
Trophic abundance
BN	13.39	< 0.0001	15.2	< 0.001	6.32	0.01	3.24	0.001
HN	21.09	< 0.0001	42.03	< 0.0001	3.33	0.07	6.13	< 0.0001
FN	15.81	< 0.0001	3.7	0.06	2.85	0.1	4.96	< 0.001
PD	0.11	0.9	3.17	0.08	3.46	0.06	0.98	0.45
Nematode indices
MI	11.31	< 0.0001	0.56	0.46	4.87	0.03	2.28	0.046
BI	6.99	0.002	3.06	0.08	6.91	0.01	1.07	0.39
CI	17.13	< 0.0001	3.78	0.06	3.33	0.07	0.7	0.65
NCR	7.13	0.002	0.55	0.46	4.99	0.003	4.39	0.001
EI	20.37	< 0.0001	4.85	0.03	14.28	< 0.001	3.3	0.007
SI	1.32	0.27	2.44	0.12	2.57	0.12	1.25	0.29
PPI	22.48	< 0.0001	47.64	< 0.0001	1.05	0.42	1.26	2.89
Soil properties
pH	31.77	< 0.0001	21.35	< 0.0001	14.86	< 0.0001	5.84	< 0.0001
OM	11.59	< 0.0001	185.78	< 0.0001	2.73	0.049	1.31	0.27
CEC	16.80	< 0.0001	34.03	< 0.0001	6.01	0.001	8.96	< 0.0001
TN	2.65	0.078	22.33	< 0.0001	88.43	< 0.0001	2.09	0.065
TC	6.35	0.003	131.65	< 0.0001	1.21	< 0.0001	5.68	0.0001
TOC	13.89	< 0.0001	157.70	< 0.0001	3.88	0.01	2.05	0.07

BN = Bacterivore nematodes, HN = Herbivore nematodes, FN = Fungivore nematodes, PD = Predator nematodes. M I = Maturity index, BI = Basal Index, CI = Channel Index, NCR = Nematodes channel ratio, EI = Enrichment Index, SI = Structure index, PPI = Plant-parasitic index, OM = organic matter, CEC = cation exchange capacity, TN = total nitrogen, TC = total carbon, TOC = total organic carbon.

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