Exogenous organic matter from agricultural and urban origins in temperate and tropical areas: usefulness of TAO to model the transformations in soil

Rabetokotany-Rarivoson Nantenaina, Razafimbelo-Andriamifidy Tantely, Masse Dominique, Pansu Marc, Thuriès Laurent. 2013. Exogenous organic matter from agricultural and urban origins in temperate and tropical areas: usefulness of TAO to model the transformations in soil. 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 : This laboratory study aimed to test the model "Transformation of Added Organic material" (TAO) for its prediction capacities on Exogenous Organic Matter (EOM) from Madagascar and Reunion Island origins. The TAO model driven by biochemical data is particularly useful to predict complex EOM transformations in soil. The C mineralization of EOMs varied according to the nature of the material: (i) from 0.10 to 1.98 gC.g-1Cadded for the raw materials, (ii) from 0.28 to 0.84 gC.g-1Cadded for the composted materials, respectively. A "priming effect" was observed for few EOMs. For 83% of the studied EOM, the C mineralization was well predicted by the TAO model with the original parameters calibrated for temperate EOM. This study provides a validation/extrapolation of TAO from temperate and dry tropical EOM to those originating from humid tropical conditions. However, a readjustment of the TAO model seems to be necessary to consider the "priming effect" process.

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

Auteurs et affiliations

• Rabetokotany-Rarivoson Nantenaina, LRI (MDG)
• Razafimbelo-Andriamifidy Tantely, LRI (MDG)
• Masse Dominique, CIRAD-PERSYST-UMR Eco&Sols (SEN)
• Pansu Marc, LRI (MDG)
• Thuriès Laurent, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0002-1365-7891

Source : Cirad - Agritrop (https://agritrop.cirad.fr/570586/)

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