Journal of Chemistry

Research Article

Natural Enrichment of Trace Elements in Surface Horizons of Calcareous Soils (La Mancha, Spain)

Table 2

pH, electric conductivity (E.C., dS/m), limestone CaCO₃ %, organic matter (O.M.%), P (Olsen) mg/kg, exchangeable cations (cmol⁺/kg), C.E.C. (cation exchange capacity, cmol⁺/kg), and exchange complex saturation (V, %).

(a)


Horizon	pH H₂O					pH KCl					E.C. (dS/m)					CaCO₃ %
Horizon	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5

	8.3	8.0	8.1	8.5	8.3	7.8	7.6	7.6	7.7	7.6	0.19	0.41	1.12	0.21	0.41	55.4	11.3	44.2	39.2	48.0
	8.5	8.4	8.0	8.4	8.3	8.0	7.5	7.5	7.7	7.6	0.21	0.59	0.66	0.15	0.58	51.1	7.8	46.1	60.2	40.3
	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	80.2	65.6	78.1	65.6	78.9

(b)


	O.M. (%)					P (Olsen) mg/kg					Exchangeable cations (cmol⁺/kg)
Horizon											Ca²⁺					Mg²⁺
	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5

	1.6	1.9	2.2	1.3	2.1	21.8	21.0	14.1	20.9	13.6	8.3	13.1	9.9	14.1	11.0	1.7	2.0	3.1	1.1	1.6
	1.5	1.1	1.7	0.8	1.3	10.6	4.6	4.0	8.1	6.6	7.0	11.1	10.2	12.8	13.8	1.5	1.0	2.4	0.7	0.4

(c)


	Exchangeable cations (cmol⁺/kg)										C.E.C. (cmol⁺/kg)					%V
Horizon	K⁺					Na⁺
	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5	P1	P2	P3	P4	P5

	0.6	1.3	1.5	0.5	0.7	1.7	1.9	2.7	1.9	1.5	12.3	18.3	17.2	17.6	14.8	100	100	100	100	100
	1.1	0.4	0.4	0.3	0.3	1.8	1.6	3.1	1.7	1.6	11.4	14.1	16.1	15.9	16.1	100	100	100	100	100