Element mobility (cation selectivity)
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Element mobility
The higher the charge and the smaller the hydrated radius of a cation, the more strongly it will adsorb to the colloid
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Order of adsorption strength
Al3+ > Sr2+ > Ca2+ > Mg2+ > Cs+ > K+ = NH4+ > Na+ > Li+
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Uptake
Cation uptake occurs through release of acidity by roots
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Input
Exchangeable cations replenished by weathering and mineralization of litter
Note 
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