Fig. 4. (A) Sum of Zn extracted in the fractions F1 and F2 versus total Zn (linear regression Eq. [16] from Table 6). (B) Ratio of Zn in F1 over sum of Zn extracted in F1 and F2 (line: F1/(F1+F2) calculated using linear regression Eq. [17] from Table 6). (C) Ratio of Zn extracted by 0.01 mol L^–1 CaCl₂ (SSR = 50 L kg^–1) over Zn in F1 (1 mol L^–1 NH₄NO₃; SSR = 25 L kg^–1). (D) Ratio of Zn extracted by 0.1 mol L^–1 BaCl₂ (SSR = 30 L kg^–1) over Zn in F1 (1 mol L^–1 NH₄NO₃; SSR = 25 L kg^–1).