Published April 1, 2005
| Version v1
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Influence of Soil Amendments on Heavy Metal Accumulation in Crops on Polluted Soils of Bangladesh
Description
Pot experiments with soils from three contaminated sites and an additional
field experiment were conducted. The aim of the experiments was to test different
organic and inorganic soil amendments to heavy metal uptake and to alleviate
toxicity in different agricultural crops. Elements in the extracts were measured by plasma emission spectroscopy (ICP-AES). Cadmium in the extracts was measured by
atomic absorption spectroscopy (AAS), with a heated graphite-tube system (HGA).
The results of the experiment were statistically evaluated by the LSD test. Almost
all treatments had positive effects on crop productivity or reduced heavy metal
uptake. Organic manures especially reduced manganese (Mn), chromium (Cr), and
nickel (Ni) uptake. Iron (Fe) oxides contained in red mud, a by-product of the
aluminum industry, reduced soil to plant transfer of zinc (Zn), Ni, cadmium (Cd),
and Cr. The results from these experiments show that it is necessary to select and
combine amendments taking into account both site and crop characteristics.
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