. 2018 Apr 17;8(26):14201–14211. doi: 10.1039/c8ra01268g

Organic matter, pH, cell number, and available element amounts of the rock and soil samples.

	Rock and soil samples^a
	Less altered rock	More altered rock	Soil sample
Organic matter (g kg⁻¹)	8.8 ± 1.0^c	11.3 ± 1.2^b	19.2 ± 3.6^a
pH	7.32 ± 0.17^a	4.63 ± 0.04^b	4.77 ± 0.10^b

Available element amounts (mg kg ⁻¹ )
Fe	134 ± 14^b	176 ± 26^a	223 ± 22^a
Si	41.02 ± 3.60^b	52.66 ± 7.49^a	34.18 ± 8.55^b
Al	1353 ± 341^b	6616 ± 1061^a	5959 ± 789^a
K	46.3 ± 2.1^c	145 ± 18^b	310 ± 84^a
Ca	771 ± 50^a	443 ± 12^b	281 ± 48^c
Mg	163 ± 10^a	84 ± 12^b	48 ± 5^c
P	23.97 ± 0.98^b	50.51 ± 9.24^a	27.61 ± 3.40^b
Bacterial count (×10⁴ cfu g⁻¹ fresh rock or soil)	2.5 ± 0.22^c	157 ± 23^b	278 ± 30^a

If values are followed by the same letter within a line, then they are not significantly different (P > 0.05) according to Tukey’s test.