Agroecological zones

locality

Soil chemical properties

Western highlands zone

Monomodal zone

Bimodal Zone

Bafang

Bassamba

Tonga

Mbanga

Melong

Penja

Binguela

Bokito

Ntui

Nitrogen, Organic carbon and Organic matter

N (%)

0.39 ± 0.10^a

0.30 ± 0.07^a

0.13 ± 0.02^b

0.38 ± 0.09^a

0.46 ± 0.01^a

0.20 ± 0.09^b

0.20 ± 0.60^b

0.37 ± 0.50^a

0.38 ± 0.07^a

OC (%)

2.86 ± 0.77^a

2.98 ± 0.65^a

2.05 ± 0.45^b

3.11 ± 0.25^a

3.18 ± 0.50^a

2.01 ± 0.52^b

2.07 ± 0.66^b

3.56 ± 0.15^a

3.09 ± 0.43^a

C/N

7.88 ± 3.40^AB

10.69 ± 4.09^AB

16.19 ± 4.64^A

8.41 ± 1.94^AB

6.84 ± 0.98^B

13.34 ± 10.75^AB

10.43 ± 3.86^AB

9.62 ± 0.88^AB

8.26 ± 1.48^AB

OM (%)

4.92 ± 1.32^a

5.13 ± 1.12^a

3.54 ± 0.78^b

5.37 ± 0.43^a

5.49 ± 0.87^a

3.46 ± 0.90 ^b

3.57 ± 1.14^b

6.14 ± 0.25^a

5.33 ± 0.75^a

Available phosphorus (ppm)

P

17.01 ± 5.44^B

16.66 ± 5.32^B

21.04 ± 9.18^B

56.96 ± 18.11^A

70.57 ± 0.34^A

57.06 ± 26.80^A

23.51 ± 8.28^B

7.57 ± 1.31^C

10.37 ± 1.45^C

Exchangeable cations (meq/100g)

Na⁺

0.02 ± 0.02^a

0.01 ± 0.00^a

0.02 ± 0.01^a

0.02 ± 0.01^a

0.02 ± 0.01^a

0.02 ± 0.01^a

0.013 ± 0.01^a

0.02 ± 0.01^a

0.02 ± 0.01^a

K⁺

1.25 ± 0.05^A

1.25 ± 0.00^A

0.43 ± 0.00^BC

1.11 ± 0.09^AB

1.07 ± 0.04^AB

0.89 ± 0.48^AB

0.20 ± 0.05^C

1.10 ± 0.28^A

1.05 ± 0.13^AB

Ca²⁺

2.03 ± 0.02^b

1.89 ± 0.38^b

2.92 ± 0.52 ^b

1.65 ± 0.54 ^b

1.68 ± 0.88^b

3.65 ± 0.90^a

3.21 ± 0.11^a

2.21 ± 0.25^a

1.98 ± 0.82^b

Mg²⁺

1.18 ± 0.42^a

1.15 ± 0.52^a

1.75 ± 0.30^a

0.91 ± 0.49^a

0.80 ± 0.26^a

1.62 ± 0.90^a

1.85 ± 0.49^a

1.27 ± 0.12^a

1.06 ± 0.22^a

SEC

4.49 ± 0.39^a

4.30 ± 1.00^a

5.11 ± 0.38^b

3.68 ± 1.10^a

3.56 ± 1.09^a

6.18 ± 1.21^b

5.27 ± 0.53^b

4.61 ± 0.63

4.10 ± 1.08^a

CEC

17.49 ± 2.03^a

17.15 ± 2.11^a

11.71 ± 0.84^a

17.94 ± 2.14^a

18.06 ± 1.68^a

12.14 ± 1.49^a

11.48 ± 0.87^a

17.05 ± 0.36^a

16.68 ± 0.15^a

Acidity

pH_Water

5.07 ± 0.65^b

5.10 ± 0.10^b

6.67 ± 0.15^a

5.50 ± 0.72^b

4.75 ± 0.35^b

6.00 ± 0.30^a

6.37 ± 0.50^a

6.33 ± 0.15^a

6.33 ± 0.23^a

pH_KCl

4.23 ± 0.42^b

4.50 ± 0.36^b

5.43 ± 0.12^a

4.87 ± 0.67^b

4.00 ± 0.00^b

4.83 ± 0.42^b

4.93 ± 0.76^b

5.63 ± 0.15^a

5.77 ± 0.31^a