Water-extractable organic matter and its fluorescence fractions in response to minimum tillage and organic farming in a Cambisol

Chemical and Biological Technologies in Agriculture

Table 2 Effects of tillage and farming practices on spectral characteristics and spectrally identified compositions of water-extractable organic matter of all treatments

Main effects	SUVA (m⁻¹ mg⁻¹ C l)	HIX	C1 (R.U.)	C2 (R.U.)	C3 (R.U.)	FI	BIX
Organic farming	1.18	4.61	1.90	0.94	0.75	1.60	0.74
Integrated	0.79	3.25	1.53	0.93	0.60	1.62	0.77
Minimum tillage	0.95	3.94	1.76	0.93	0.69	1.60	0.75
Plowing	1.02	3.92	1.67	0.94	0.66	1.61	0.76
0–8-cm depth	1.14	3.53	1.98	1.18	0.80	1.58	0.76
12–25 cm	0.82	4.33	1.45	0.69	0.55	1.64	0.75
Probability values
Farming	<0.01	<0.01	0.01	NS	0.01	NS	0.06
Tillage	NS	NS	NS	NS	NS	NS	NS
Depth	<0.01	<0.01	<0.01	<0.01	<0.01	0.03	NS
Farming × tillage	0.08	NS	NS	NS	NS	NS	NS
Farming × depth	NS	NS	NS	NS	NS	NS	NS
Tillage × depth	NS	0.07	<0.01	<0.01	<0.01	0.06	0.09
CV (±%)	9	6	8	7	9	1	2

The results presented in the table are geometric means of all plots within each main factor treatments
CV mean coefficient of variation between replicate plots (n = 3), SUVA specific absorption, HIX humification index, FI fluorescence index, BIX freshness index