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The two ions are you most likely to see adsorbed to the exchange complex of a soil in an arid environment are Na+, K+, Ca2+.
What are exchangeable bases in soil?
Exchangeable bases allow alkali and alkaline earth metals (mainly calcium, magnesium, potassium, and sodium) to bind to the organic constituents of clays and soils, to each other and to other positively charged ions in soil solutions. Broadly defined as anything that can be exchanged with ions.
What is the exchange capacity of soil?
The total number of cations a soil can hold, or its total negative charge, is the soil's cation exchange capacity. The higher the CEC, the higher the negative charge and the more cations it can hold. CEC is measured in milliequivalents per 100 grams of soil.
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