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PLANT AVAILABILITY OF TRACE ELEMENTS IN SEWAGE SLUDGE-TREATED SOILS: METHODOLOGY

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Table 2. Properties of saturation extracts of the control and sewage sludge-treated soils (1)
Figure 1. Successive extractions for 24 or 48 hours of Zn, Cd, Ni, Cr, and Cu from a sewage sludge-treated soil by organic acid mixtures (50 and 100 mmol L -1 ).
Table 4. Chemical species of metals successively extracted by the synthetic root exudates of 0.1 mol L -1  organic acid strength in back ground matrix of 4 mmol L -1  of CaSO 4  + 0.5 mmol L -1  of NaCl

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