Thus, it is likely that the application of cassava waste water to the soil contributed to an increase in pH by addition of exchangeable cations, especially potassium, magnesium, and calcium, which were present in the waste water (Table 2). The introduction of bases into the soil favors the increase in pH, as these have the ability to adsorb the sorption complex, shifting elements (hydrogen and aluminum) responsible for the potential acidity of the soil solution; once shifted to the soil solution, aluminum precipitates as Al2 SO4 , contributing
to the increase in pH [25]. The rise in pH is strongly correlated
with the increase in base saturation of the soil [11].