Nitrogen transformations in copper-contaminated soils and effects of lime and compost application on soil resiliency |
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| Authors: | O. Kostov Oswald Van Cleemput |
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| Affiliation: | (1) N. Poushkarov Institute of Soil Science and Agroecology, 7 Shosse Bankya, 1080 Sofia, Bulgaria e-mail: val.kost@mbox.cit.bg Fax: +359-2-248937, BG;(2) University of Ghent, Faculty of Agricultural and Applied Biological Sciences, Department of Applied Analytical and Physical Chemistry, Coupure links 653, 9000, Gent, Belgium, BE |
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| Abstract: | A neutral and an acidic soil were treated with different doses (0–3,000 mg Cu kg–1 soil as CuSO4) of copper. The percentages of inhibition of nitrification in both soils varied from 5 to 97%, but for the N mineralization these percentages varied from 8 to 65%. The toxic effect of Cu for basal nitrification and N mineralization was assessed as critical. Nitrification was more sensitive than ammonification to copper toxicity. It appears that an ecological dose of inhibition for nitrification and N mineralization higher than 10% is suitable as an indicator for Cu contamination. Soil resiliency assessed by N mineralization in the lime treatments varied from 11 to 154% in the sandy soil and from 70 to 168% in the sandy loam soil. A combined application of lime and compost significantly increased soil resiliency. The percentage increase varied from 904 to 1,390% in the sandy soil and from 767 to 2,230% in the sandy loam soil. It appears that compost was a powerful agent for recovering the soil fertility of Cu-contaminated soils as assessed by N transformation. The acidic sandy soil showed a lower capacity for recovery after Cu toxicity stress. Received: 27 February 1999 |
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| Keywords: | Contamination Compost Nitrogen transformation Heavy metal Soil resiliency |
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