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Effect of Biosolids on Heavy Metal Bioavailability and Organic Acid Production in Rhizosphere of Zea mays L.  

Koo, Bon-Jun (Savannah River Ecology Laboratory)
Chung, Doug-Young (Department of Bioenvironmental Chemistry, Chungnam National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.38, no.4, 2005 , pp. 173-179 More about this Journal
Abstract
A greenhouse experiment was conducted to evaluate the composition of organic acids on the bioavailability of heavy metals in the rhizosphere of corn (Zea mays L.) over 12 weeks after treatment of biosolids. After planting the plants were sampled at 12th week and analyzed for heavy metals in shoot and root and organic acids in the rhizosphere. Results showed that biomass yields of Zea mays L. grown on biosolids-treated media were significantly higher than those grown on standard media. The effect of biosolids on biomass yields of Zea mays L. was in order of Riverside ${\approx}$ Los Angeles ${\approx}$ MWRDGC > Milorganite > Nu-earth > standard media. Metal uptake by Zea mays L. was closely related with the contents contained on biosolids treated. In the plot treated with Nu-earth the uptake of Cd and Zn by shoot was significantly higher than those at the plots treated with other biosolids. The uptake patterns of Cd and Zn by root were similar to those of shoot. The uptake of Cr and Ni was significantly higher with application of Nu-earth over other biosolids. In all cases, the major organic acids in the rhizoshpere were lactic, acetic, propionic, butyric, and oxalic acids. Other organic acids were glutaric and succinic and occasionally, pyruvic and tartaric acids were also found. And the organic acid compositions did not vary significantly with the treatments of biosolids. Butyric and acetic acids were distinctively dominant both in the standard and the biosolids treatments.
Keywords
Biosolid; Bioavailability; Heavy metal; Organic acid; Root exudate;
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