The observed significant differences in soil properties reflect differences in Jenny’s state factors of
soil formation (Jenny, 1941), and in the case of various P pools to differential P input rates. The low soil
reaction coupled with high exchangeable Al in the TKO has early been described by several researchers
(Tchienkoua et al., 1990; van Gemerden and Hazeu, 1999) and can be accounted for by the geochemical