Chemical Changes in Soil and Plants After Successive Amendments of Tunisian MSW Compost |
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| Authors: | Fethia Ayari Saoussen Benzarti Helmi Hamdi Naceur Jedidi Neji Gharbi Ridha Kossai |
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| Institution: | 1. Water Research and Technology Center, Borj Cedria Technopark, Soliman, Tunisia fethia_ayari@yahoo.fr;3. Graduate School of Environmental Science, Okayama University, Okayama, Japan;4. Water Research and Technology Center, Borj Cedria Technopark, Soliman, Tunisia;5. IPEIT, University of Tunis, Montfleury, Tunis, Tunisia |
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| Abstract: | A field study was carried out to evaluate long-term heavy metal (HM) accumulation in the top 20 cm of a Tunisian clayey loam soil amended for (four years) with municipal solid waste compost (MSWC) at three levels (0, 40 and 80 t ha?1 year?1). HM uptake and translocation within wheat plants grown on these soils were also investigated. Compared to untreated soils, MSWC-amended soils showed significant increases in the content of all measured HM (Cd, Cr, Cu, Ni, Pb and Zn) in the last three years, especially for the 80 t ha?1 year?1 MSWC-amended plots. Wheat plants grown on MSWC-amended soils showed a general increase in metal uptake and translocation, especially for Cr and Ni. This HM uptake was about three fold greater for treatment 80 t h?1 as compared to plots amended at a rate of 40 t h?1. At times, the diluting effect resulting from enhanced growth rates of the plants with compost application resulted in lower concentrations in the plants grown (grain part) on treated plots. On the other hand, Cr and Ni were less mobile in the aerial part of wheat plants and were accumulated essentially in root tissues. Plant/soil transfer coefficients for MSWC-amended treatments were higher than threshold range reported in the literature, indicating that there was an important load/transfer of HM ions from soils to wheat plants. |
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