Cadmium and zinc uptake by oat from soils amended by sewage sludge incubated with lime and bentonite
2000
Balik, J. | Tlustos, P. | Pavlikova, D. | Szakova, J. | Kaewrahun, S. | Hanc, A. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
The effect of application of differently treated and incubated sludge on the accumulation of Cd and Zn in oat biomass was investigated in pot experiment. Three soils (Chernozems, Luvisols and Fluvisols) and three sewage sludges were tested. Sewage sludge treated by betonite in the amount of 30 % of dry matter of sludge and by calcium carbonate in the amount of 18 % was preincubated for eight months under aerobic and anaerobic environment at temeprature of 20 deg C. The oat Cd and Zn contents were substantially affected by tested soil. The highest accumulation of both elements in oat biomass was determined at Fluvisols. The addition of lime more affected content of elements in oat biomass than bentonite application. Cd and Zn contents in plants were not influenced by the prresence of air during sludge incubation. Positive effect of lime addition into sludge was confirmed by lower extractable content of both elemnts from treated soil by 0.01 mol/l CaCl2 and by 0.025 mo/l NH4EDTA solution. Extraction of elements by 2 mol/l NHO3 did not show any difference among treatments.
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