Fig. 2. Exchange isotherms for Pb²⁺ or Ca²⁺ replacing K⁺ on exchange sites as well as heterovalent exchange nonpreference isotherm on the Oxisol and Ultisol soils. E_Ca and E_Pb = equivalent fractions of either Ca²⁺ or Pb²⁺ on the exchanger and E'_Ca and E'_Pb = equivalent fractions of either Ca²⁺ or Pb²⁺ in the equilibrium solution.

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