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Fig. 3. Dependence of log concentration of Pb in plant tissue on the log of (a) effective Pb concentration, CE, before growth, (b) effective Pb concentration, CE, after growth, (c) soil solution Pb, before growth, (d) soil solution Pb, after growth, (e) free Pb2+ activity, (f) CaCl2–extracted Pb, and (g) total soil Pb. The quadratic regression equations and regression coefficients are shown. Only nine soils are included as Kapunda soils were below Pb detection limit for some measurements. The E values were not determined for Pb (no suitable radioisotope available).
