Chemical and Physical Characteristics in Uncultivated Soils with Different Lithology in Semiarid Mediterranean Clima

Table 2

Mean concentrations for major elements content in soils (energy dispersive-XRF); measurement relative standard error was less than 5%.

Sample	Na2O (%)	MgO (%)	K2O (%)	CaO (%)	TiO2 (%)	MnO (%)	Fe2O3 (%)	Al2O3 (%)	SiO2 (%)	P2O5 (%)	LOI (%)	SUM
O	0.6	0.5	1.2	1.0	0.4	0.1	3.8	8.4	83.1	<0.05	1.0	100.1
La	<0.2	3.8	1.7	0.9	0.6	0.2	6.2	23.3	61.6	0.4	1.6	100.1
U	<0.2	26.4	0.5	1.2	0.4	0.3	11.1	6.2	40.9	<0.05	13.8	100.6
Ka	1.5	0.5	1.6	0.02	0.8	0.04	4.9	14.2	72.1	0.1	4.2	99.9
Kb	1.00	<0.2	1.8	0.4	0.8	0.03	4.1	14.5	62.2	<0.05	14.9	99.7
PL	<0.2	2.5	1.7	26.4	—	0.1	2.3	4.7	24.2	—	38.4	100.2

—: not determined.