	TOC (g・kg⁻¹)	HAC (g・kg⁻¹)	FAC (g・kg⁻¹)	HUMC (g・kg⁻¹)	HAC:FAC	EAC:HUMC
0 - 5 cm
Soil management systems
NT	27.52 b	3.57 ab	7.24 ab	12.22 ab	0.49	0.88
RT	31.29 a	4.28 a	7.66 a	13.27 a	0.56	0.90
CT	23.84 c	2.46 b	6.31 b	11.48 b	0.40	0.76
Cover crops
M	27.73^ns	3.76^ns	7.16^ns	12.58^ns	0.53	0.87
MM	26.68^ns	3.11^ns	6.98^ns	12.07^ns	0.46	0.84
5 - 10 cm
Soil management systems
NT	23.64^ns	4.43^ns	5.30^ns	9.86^ns	0.84	0.99
RT	23.64^ns	3.82^ns	5.13^ns	10.74^ns	0.74	0.83
CT	24.01^ns	4.19^ns	4.87^ns	10.14^ns	0.86	0.89
Cover crops
M	24.14^ns	4.21^ns	5.13^ns	10.33^ns	0.82	0.90
MM	23.39^ns	4.08^ns	5.07^ns	10.16^ns	0.80	0.90
10 - 30 cm
Soil management systems
NT	21.02^ns	4.54^ns	3.60^ns	9.79^ns	1.26	0.83
RT	21.20^ns	3.99^ns	3.78^ns	9.58^ns	1.06	0.81
CT	20.65^ns	4.10^ns	3.38^ns	9.44^ns	1.21	0.79
Cover crops
M	20.52^ns	4.28^ns	3.61^ns	9.60^ns	1.19	0.82
MM	21.39^ns	4.14^ns	3.56^ns	9.60^ns	1.16	0.80