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| Effects of Municipal Sludge Composts on Heavy Metal Accumulation in Soil and Soybean |
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| KeyWord:sewage sludge compost; heavy metal; soil; soybean; accumulation |
| Author Name | Affiliation | | LI Shu-qin | College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China | | TIAN Zhong-he | College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China | | JIN Hong-xin | College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China | | YU Miao | College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China | | XU Jing-gang | College of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: |
| Accumulation of heavy metals in soils is a factor limiting the application of municipal sludge composts in agriculture. A plot experiment was performed to investigate the effects of municipal sewage sludge composts on heavy metal accumulation in soil and soybean plants in black soil in the Northeast China. Concentrations of Cu, Zn, Cd and Pb in soil and of Cu, Zn, and Cd in soybean plants increased gradually with increasing applications of sludge composts, while Pb was not detected in soybean. The contents and enrichment coefficients of Cu and Zn in soybean were in order of grain>root>pod>stem, while those of Cd were stem>root>pod>grain. At the present application rates of sludge composts, the contents of Cu, Zn, Cd, and Pb in soil and soybean did not exceed the national standards. However, applying the compost more than 12 t·hm-2 caused Cd enrichment in the stem, although the enhancements of other metals were not obvious. The compost application increased dry biomass and yield of soybean, with 12.65% increase in yield in the treatment D（24 t·hm-2）. The findings suggest that it is necessary to assess the impacts of municipal sludge composts on soil and plants before applying to soils. |
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