Drake et al. (1961) have explained differential cation uptake by plant species on the basis of variable root cation-exchange capacities. Elgabaly and Wiklander (1949). emphasized that both root colloids and soil colloids. compete for ions. Cation uptake by plants depends on the relative cation-- exchange capacities of root and soil colloids. But no one has yet explained how cation-exchange of roots plays a direct role in differential uptake of cations by plants. In this study, an attempt was made to establish relationships between cations adsorbed and absorbed by roots.
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