Chapter 5 Flashcards
Countries that are considered to have older soils?
Tropical countries
Countries that have “younger soil”.
Temperate countries
What is the charge of the soils in tropical countries
positively charged
What is the charge of the soils in temperate countries?
negatively charged
Are soils in temperate countries more fertile than in tropical countries?
True
Soils in tropical countries are positively charged and considered older soils because of the presence of what?
sesquioxides
kaolinites
Fe/Al
It refers to the cations adsorbed on negatively charged surfaces.
CEC - Cation Exchange Capacity
Does higher pH lead to higher or lower CEC?
higher CEC
Does a lower pH lead to a higher or a lower CEC?
lower CEC
It refers to the anions adsorbed on positively charged surfaces.
AEC - anion exchange capacity
The degree to which soil can adsorb and exchange anions.
AEC - anion exchange capacity
What will happen to AEC at higher pH?
decreases or lower AEC
What will happen to AEC at lower pH?
increases or higher AEC
AEC plus specifically adsorbed anions plus anions retained (sorbed) by other mechanisms like precipitation or adsorption into colloid complexes, particularly the organic and amorphous complexes.
ASC - anion sorption capacity
Net accumulation of materials at the interface between a solid phase and an aqueous solution phase.
Adsorption
