African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 5890

Full Length Research Paper

Translocation of metals in two leafy vegetables grown in urban gardens of Ntoum, Gabon

  Jean Aubin ONDO1,2*, Pascale PRUDENT1, Richard MENYE BIYOGO2, Jacques RABIER3, François EBA2 and Mariane DOMEIZEL1        
  1Aix-Marseille Université, CNRS, LCE, FRE 3416, 13331 Marseille, France. 2Laboratoire pluridisciplinaire des sciences de l’Ecole Normale Supérieure, B. P. 17009 Libreville, Gabon. 3Equipe BBE, UMR-CNRS/IRD 6116 IMEP, Aix-Marseille université, case 97, 3, place Victor-Hugo, 13331 Marseille cedex 03, France.
Email: [email protected]

  •  Accepted: 05 October 2012
  •  Published: 30 November 2012

Abstract

 

The aim of this study was to investigate the properties of cultivated urban soils and metal concentrations in these soils and in roots and leaves of the crops Amaranthus cruentus (amaranth) and Hibiscus sabdariffa(roselle). The soil physicochemical properties showed a poor fertility rate of cultivated soils. The metal concentrations in soils were in the range of concentrations for uncontaminated agricultural soils. The ranges of concentrations of metals were as follows: Aluminium (Al), 239-1222 mg/kg; cadmium (Cd), < 0.3. mg/kg; copper (Cu), 9.3-31.7 mg/kg; iron (Fe), 166-617 mg/kg; manganese (Mn), 18.1-187.5 mg/kg; lead (Pb), < 2.36 mg/kg; zinc (Zn), 25.2-66.9 mg/kg. The accumulation of metals was as follow: In leaves, Fe > Al > Mn > Zn > Cu >Pb; in roots, Al > Fe > Zn > Mn > Cu > Pb. Al and Fe were weakly bioaccumulated but their concentrations were high. Cu and Mn were more accumulated in leaves than roots for amaranth and roselle. The leaves of amaranth were found to accumulate soil Cu and Zn more efficiently than other tissues of both vegetables. The translocation factor was in the order: Mn > Cu > Fe > Zn > Al, and when this value was compared between amaranth and roselle, it was observed to be higher in amaranth than in roselle. The concentrations of the essential elements Cu and Mn in roselle, and Cu, Fe, Mn and Zn in amaranth indicate that these leafy vegetable are a good nutrient sources.

 

Key words: Soil, edible vegetables, metals, bioconcentration factor (BCF), translocation factor (TF).

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