Table 3 Main characteristics of soils

Clay (%)

16.0

3.3

9.0

26.4

Sand (%)

70.6

7.3

55.1

83.7

Silt (%)

13.4

5.2

6.1

24.5

pH

4.5

0.5

3.7

5.6

Exchangeable acidity (cmol₍₊₎ kg⁻¹)

13.4

4.6

5.6

23.6

Total organic C/total organic P

1114

896

338

4311

Ca⁺² (cmol₍₊₎ kg⁻¹)

0.9

0.7

0.2

2.9

K⁺ (cmol₍₊₎ kg⁻¹)

0.17

0.05

0.08

0.34

Mg⁺² (cmol₍₊₎ kg⁻¹)

0.13

0.13

0.01

0.52

Cation exchange capacity (cmol₍₊₎ kg⁻¹)

18.8

3.1

11.8

24.2

Base saturation (%)

7.3

5.3

2.4

21.1

Easily oxidizable carbon (%)

2.2

0.6

1.3

3.4

Al within amorphous oxyhydroxides (mg g⁻¹)

6.6

2.5

2.5

11.6

Exchangeable Al (cmol₍₊₎ kg⁻¹)

6.8

3.8

0.0

14.3

Organically bound Al (mg g⁻¹)

9.1

3.9

2.7

17.9

Fe within amorphous oxyhydroxides (mg g⁻¹)

4.0

1.5

1.7

7.9

Organically bound Fe (mg g⁻¹)

4.6

1.7

1.8

7.7

Microbial biomass C (mg kg⁻¹)

113.4

47.4

45.5

232.9

Mineralizable C (mg kg⁻¹ week⁻¹)

56.3

21.6

22.0

112.1

Microbial biomass P (mg kg⁻¹)

11.0

5.8

4.6

32.2

Acid phosphatase activity (μg g⁻¹ h⁻¹)

8.8

6.0

0.5

24.4