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Uptake of six heavy metals by oat as influenced by soil type and additions of cadmium, lead, zinc and copper

Summary

The influence of heavy metal additions on availability and uptake of cadmium, lead, zinc, copper, manganese and iron by oat was studied. The experiments were carried out as pot experiments using sandy loam, sandy soil and organic soil. Selective extractants were used to remove metals held in different soil fractions.

Lead and copper were preferently bound by organics and oxides, zinc by oxides and inorganics, and cadmium by inorganics and organics.

Addition of cadmium to the soils resulted in higher cadmium concentrations in all plant parts but lower concentrations of lead, zinc, copper, manganese and iron, and the accumulation indexes of these metals were also lower when cadmium was added to the soil.

Addition of cadmium plus lead, zinc and copper resulted in higher cadmium concentrations in leaves and straw of plants grown in sandy loam and sandy soil, but lower concentrations when plants were grown in organic soil as compared with the results when cadmium was added separately. The transfer of cadmium, lead, zinc and copper from soil to plant was greatest from sandy soil, and zinc and cadmium were more mobile in the plant than were lead and copper.

Cadmium concentrations in leaves correlated significantly with CaCl2 and CH3COOH extractions in sandy loam and sandy soil and with CH3COOH extractions in organic soil.

Generally, the total metal uptake was lowest from organic soil.

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Bjerre, G.K., Schierup, HH. Uptake of six heavy metals by oat as influenced by soil type and additions of cadmium, lead, zinc and copper. Plant Soil 88, 57–69 (1985). https://doi.org/10.1007/BF02140666

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  • DOI: https://doi.org/10.1007/BF02140666

Key words

  • Availability
  • Cadmium
  • Copper
  • Iron
  • Lead
  • Manganese
  • Oat
  • Uptake
  • Zinc