Anion Exchange Capacity
Similar to the CEC, the Anion Exchange Capacity is a measurement of the positive charges in soils affecting the amount of negative charges which a soil can absorb. There are relatively few anions that are restrictive in agriculture, but they are important, such as sulfur or phosphorus. The anion lyotrophic series is:
H2PO4- > SO4-2 > NO3- > Cl-
In contrast to CEC, AEC generally will decrease when pH drops and increase when pH rises.
Read more about this topic: Cation-exchange Capacity
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