Research Article
Physicochemical Properties and Fertility Assessment of Soils in Foumban (West Cameroon)
Table 3
Criterion for assessing soil fertility classes [
62] modified by Reference [
63].
| | Characteristic | Level I (no limitation) | Level II (moderate limitation) | Level III (severe limitation) | Level IV (very severe limitation) |
| | OM (%) | >2 | 100-2 | 0.5-1 | <0.5 | | N (%) | >0.08 | 0.045-0.08 | 0.03-0.045 | <0.03 | | P (ppm) | >20 | 10-20 | 5-10 | <5 | | K (méq/100 g) | >0.4 | 0.2-0.4 | 0.1-0.2 | <0. 1 | | S (méq/100 g) | >10 | 5-10 | 2-5 | <2 | | S/CEC (%) | >60 | 40-60 | 15-40 | <15 | | CEC (méq/100 g) | >25 | 10-25 | 5-10 | <5 | | pHe | >5.5 | 5.1-5.5 | 4.75-5.1 | <4.75 | | IB | ≤1.4 | 1.6-1.4 | 1.8-1.6 | ≥1.8 | | IF | >1.5 | — | — | <1.5 | | ISS | >9 | 7-9 | 5-7 | <5 | | M (%) | <20 | 20-40 | 40-60 | >60 |
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