pH / BS
Fragment of a discussion from Course talk:APBI200/Archive/2016-17WT2
Ok, I think what is confusing me is buffering capacity...
Sandra mentioned in the review session that the difference between the active acidity and exchangeable acidity relates to the buffering capacity. The smaller the difference is the higher the buffering capacity, is what I thought she said. I'm trying to relate that to other concepts to understand it better.
re: pH in water versus pH in CaCl2
pH in water measures the pH of soil solution
pH in CaCl2 measures exchangeable acidity (thus pH in CaCl2 will be lower than pH in water). The lower the pH in CaCl2 relative to the pH in H2O, the greater the exchangeable acidity.
SandraBrown (talk)