Table 2 Values of soil properties defining SFI per soil class (average ± standard deviation)
Appreciation criterion of soil fertility | Farmer fertility classes | Corresponding laboratory results | Soil fertility indexes | ||||
|---|---|---|---|---|---|---|---|
pH water | Organic carbon (%) | Available P (mg kg−1) | K (cmol/kg) | SFI | MLFI | ||
Soft soil and dark | High fertility (N = 21) | 6.1 ± 0.3 | 2.4 ± 0.5 | 17.5 ± 5 | 0.5 ± 0.8 | 5.8 ± 0.3 | 4.7 ± 1 |
Sandy to soft, Light to dark | Medium fertility (N = 19) | 5.8 ± 0.2 | 2.8 ± 0.8 | 12.8 ± 4 | 0.3 ± 0.3 | 5.8 ± 0.3 | 4.0* |