Influence of Ca, pH and humic acid on Cd uptake
1982
Tyler, L.D. | McBride, M.B. (Cornell Univ., Ithaca (USA). Dept. of Agronomy)
Solution culture experiments were conducted to examine the effect of naturally occurring components of soil solutions such as Ca-ion, H-ion and organic acids on the Cd uptake of corn and snap beans. An increase in the Ca-ion concentration of solution cultures depressed the translocation of Cd from roots to tops of snap beans and corn but had no apparent effect on the absorption of Cd by roots. Suppression of Cd translocation by Ca was less marked for the corn than for the beans. No change in Cd absorption or translocation in corn was noted for solution pH values ranging from 4 to 7. Addition of humic acid to the solution decreased the Cd activity in solution and the subsequent absorption of Cd by corn roots, indicating that Cd-ion activity in solution directly affects Cd uptake. The addition of humic acid had no effect on Cd translocation in corn plants.
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