Abstract
Abstract Trace metal uptake by soybean shoots (Glycine max L. Merr.) as a function of cation exchange capacity (CEC) was studied. A sludge amended (0, ‐23.2, and 46.7 mt/ha) Typic Hapludoll soil whose CEC was adjusted between 18.5 to 5.2 meq/100 g by dilution with sand and whose pH was 6.6 was used in a growth chamber experiment. For a given sludge‐application rate Cd, Zn, Cu, Cr, and Pb uptake remained constant as the soil CEC increased. The Cd uptake reached a maximum at the sludge‐application rate of 23.3 mt/ha, Zn and Ni uptake increased and Cu, Cr, and Pb uptake remained constant as sludge‐application rate increased. At all sludge‐application rates dry matter yields did not vary widely as the soil CEC increased.
Published Version
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