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Negative externalities of intensive use of organic wastes on two tropical soils in the context of urban agriculture in the region of Dakar

Hodomihou N.R., Feder F., Agbossou E.K., Masse D., N'dour-Badiane Y., Cazevieille P., Chevassus-Rosset C., Montes M., Marger J.L., Doelsch E.. 2013. In : INRA. 15 ème Conférence internationale RAMIRAN: Recyclage des résidus organiques pour l'agriculture: de la gestion des déchets aux services écosystémiques, Versailles, France, 3 au 5 juin 2013. s.l. : INRA, 4 p.. International Ramiran Conference. 15, 2013-06-03/2013-06-05, Versaille (France).

The use of organic wastes (OW) as fertilizer has ne gative effects on the agroecosystem due to their trace elements (TE) content. This research aimed to assess the risk of agroecosystem contamination by TE (Cd, Cr, Cu, Ni, Pb and Zn) in the context of OW recycling in market gardening on arenosol (loamy sand) and fluvisol ( clay loam) from Dakar (Senegal). The inventory (con ducted with 40 market-gardeners) and soil profiles analyses reveal ed a significant contamination in all TE on the surface layer (0-20 cm) of arenosol, where the sewa ge sludge (SS) is used intensively. On the fluvisol , poultry dung (PD) spreading induced only Zn contami nation (an increase of the order of 22%) in the superficial layer (0-40 cm) as compared to control of the site investigated. Indeed, SS contained high er concentrations of Zn, Cu, Pb and Cr (respectively 1 003, 323, 50 and 41.2 -1 of dry matter) than PD (respectively 320, 22, 2.0 and 21 -1 of dry matter).

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