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Fig. 3. Water-soluble Pb (mean ± SD) in the surface humic soil layer (A) in non-planted units and (B) in planted units with peat layers of 1, 2, and 3 cm, plus a control unit with no added peat. Leaching treatments were performed at Days 34 and 76. The sampling day is given in the bar and leaching tests are marked with arrows.
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