The exchangeable acidity of the soil samples was
quite low and often no more than 1 or 2 meq 100 g-1. Such
low exchangeable acidity values for soils with low pH
reveals that the soil had low cation exchange capacity
(Boyd, 1995). The low exchangeable acidity concentrations
also were difficult to measure, because an expandedscale
pH meter capable of 0.01 pH accuracy was not
available.