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Typology of exogenous organic matters based on chemical and biochemical composition to predict potential nitrogen mineralization

Lashermes G., Nicolardot B., Parnaudeau V., Thuriès L., Chaussod R., Guillotin M.L., Lineres M., Mary B., Metzger L., Morvan T., Tricaud A., Villette C., Houot S.. 2010. Bioresource Technology, 101 (1) : p. 157-164.

Our aim was to develop a typology predicting potential N availability of exogenous organic matters (EOMs) in soil based on their chemical characteristics. A database of 273 EOMs was constructed including analytical data of biochemical fractionation, organic C and N, and results of N mineralization during incubation of soil-EOM mixtures in controlled conditions. Multiple factor analysis and hierarchical classification were performed to gather EOMs with similar composition and N mineralization behavior. A typology was then defined using composition criteria to predict potential N mineralization. Six classes of EOM potential N mineralization in soil were defined, from high potential N mineralization to risk of inducing N immobilization in soil after application. These classes were defined on the basis of EOM organic N content and soluble, cellulose-, and lignin-like fractions. A decision tree based on these variables was constructed in order to easily attribute any EOM to 1 of the 6 classes. (Résumé d'auteur)

Mots-clés : fertilité du sol; composition chimique; classification; cycle de l'azote; minéralisation; amendement organique; matière organique du sol; disponibilité d'élément nutritif; teneur en azote

Thématique : Fertilité du sol; Chimie et physique du sol; Fertilisation

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