Table 2. SOC content statistical description.

Sample set	Sample size	Maximum value	Minimum value	Mean value	Standard deviation	Coefficient of variation (%)
Whole dataset	123	27.8	2.2	8.78	4.89	55.75
Modeling dataset	86	27.8	2.2	8.63	4.07	47.19
Validation dataset	37	27.6	3.1	9.15	6.47	70.78