Table 2 Descriptive statistics of the chemical parameters of the soils (mean value and standard deviations)

Soil types

Cambisols, Umbrisols, Regosols

Leptosols, Regosols, Umbrisols, Cambisols

Regosols

pH_KCl

3.9 (0.2)

3.8 (0.4)

4.3

\( {\mathrm{pH}}_{{\mathrm{H}}_2\mathrm{O}} \)

5.2 (0.3)

4.9 (0.7)

5.4

C (%)

6.4 (2.8)

7.8 (4.5)

3.8

N (%)

0.5 (0.2)

0.5 (0.4)

0.3

P Olsen (ppm)

6.5 (2.8)

6.8 (3.2)

12.4

Ca (cmol⁺∙kg⁻¹)

0.46 (0.13)

0.44 (0.30)

1.41

Mg (cmol⁺∙kg^− 1)

0.40 (0.10)

0.70 (0.40)

0.52

K (cmol⁺∙kg⁻¹)

0.32 (0.16)

0.15 (0.05)

0.49

CEC (cmol⁺∙kg⁻¹)

2.70 (0.90)

2.11 (1.30)

4.8

Al saturation (%)

55 (15)

61 (20)

46.7