Tillage System Affects Soil Organic Carbon Storage and Quality in Central Morocco

Table 1

Selected soil characteristics at the different sites (Merchouch, Morocco).

Site/soil	Depth; (cm)	Clay; (%)	Silt; (%)	Sand; (%)	Texture class	pH; (1.1 H2O)	P2O5; (mg/kg)	K2O; (mg/kg)	CaCO3 total; (g/kg)	SOC; (g/kg)
Site 1; Vertisol	0–20	49	29.5	21.5	C	7.02	21	234	3.6	12.2
	20–80	52	26.6	21.4	C	7.23	11	133	7.3	11.4
	80–120	53	23.1	23.9	C	7.37	5	139	8.5	9.7
Site 2; Cambisol	0–25	44	37	18	C	7.9	58	237	1.2	11.7
	25–55	41	49	10.0	SiC	7.8	5	133	4.4	11.1
	55–90	38	55	7.4	SiL	7.7	3	108	9.5	5.5
Site 3; Luvisol	0–15	19	36	45	L	7.1	40	259	5.5	7.4
	15–50	25	28	47	L	7.2	14	129	10.5	6.5
	50–100	36	21	43	L	7.4	4	109	10.1	6.2

C: clay; SiC: silty clay; SiL: silty loam; L: loam (following the textural triangle [13]).