This is supported by a high kurtosis
(3). Some extreme values are observed for: OM under RA
(15.71%) and FG (12.40%); pHw, Ca, Mg, and K under FR1; C/N ratio
(13.61) and Al (6.03 Cmol/kg) under FG. In South Cameroon, soils
are strongly unsaturated in exchange basic cations with extremely
acid pHw (pHw 3). High pHw values and increasing exchange base
cations (Ca, Mg, K) under FR1 can be ascribed to ash from burned
vegetation biomass which acts as lime fertilizer.