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

Hodomihou Nounagnon Richard, Feder Frédéric, Agbossou Euloge Kossi, Masse Dominique, N'dour-Badiane Yacine, Cazevieille Patrick, Chevassus-Rosset Claire, Montes Mélanie, Marger Jean-Luc, Doelsch Emmanuel. 2013. Negative externalities of intensive use of organic wastes on two tropical soils in the context of urban agriculture in the region of Dakar. In : 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. INRA. s.l. : INRA, 4 p. International Ramiran Conference. 15, Versaille, France, 3 Juin 2013/5 Juin 2013.

Résumé : 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 mg.kg -1 of dry matter) than PD (respectively 320, 22, 2.0 and 21 mg.kg -1 of dry matter).

Classification Agris : Q70 - Traitement des déchets agricoles
F04 - Fertilisation
P33 - Chimie et physique du sol
P02 - Pollution

Auteurs et affiliations

• Hodomihou Nounagnon Richard, CIRAD-PERSYST-UPR Recyclage et risque (SEN)
• Feder Frédéric, CIRAD-PERSYST-UPR Recyclage et risque (SEN) ORCID: 0000-0001-8434-5193
• Agbossou Euloge Kossi, UAC (BEN)
• Masse Dominique
• N'dour-Badiane Yacine, ISRA (SEN)
• Cazevieille Patrick, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Chevassus-Rosset Claire, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Montes Mélanie, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-0678-0541
• Marger Jean-Luc
• Doelsch Emmanuel, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-7478-4296

Source : Cirad - Agritrop (https://agritrop.cirad.fr/570565/)

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