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dc.contributor.authorVanlauwe, Bernard
dc.contributor.authorDendooven, L.
dc.contributor.authorMerckx, R.
dc.identifier.citationVanlauwe, B., Dendooven, L. & Merckx, R. (1994). Residue fractionation and decomposition: the significance of the active fraction. Plant and Soil, 158, 263-274.
dc.description.abstractThis paper describes an incubation experiment with homogeneously 14C labeled maize-straw and its insoluble fraction. The role of the soluble fraction in the decomposition process was assessed, using three independently measured characteristics: (1) fractionation of the maize-straw, resulting in kinetically different fractions; (2) microbial biomass C and its 14C activity determined by a fumigation extraction method, and (3) the 14C activity of the released CO2-C. The fumigation extraction method was proved to be useful from 9 days after the application of the maize-straw onwards. The fractionation method yielded a soluble (48%), a (hemi) cellulosic (47%), and a lignin fraction (1%). Nine days after addition of either the complete residue or its insoluble fraction, the microbial biomass C increased from 53 to 337 and 217 mg C kg-1 dry soil, respectively. Similar values were maintained up to day 40. The large increase in microbial activity was accompanied by a N-immobilization of 65 and 29 mg N Kg-1 dry soil for the maize-straw treatment and its insoluble fraction, respectively, resulting in biomass C/N values of 5.5 and 5.6 A genuine priming effect (10 and 7% of the total CO2-C production) on the mineralization of native soil organic C was caused by an increase in decomposition of the native C rather than by an increase in turnover of the microbial biomass in the soil amended with maize straw. The soluble fraction caused a 'priming effect' on the decomposition of the less decomposable cell-wall fraction. Calculations by nonlinear regression confirmed this observation.
dc.titleResidue fractionation and decomposition: the significance of the active fraction
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationKatholieke Universiteit, Leuven
cg.contributor.affiliationUniversity of Exeter
cg.coverage.regionWest Africa
cg.coverage.countryUnited Kingdom
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectFood Security
cg.iitasubjectSoil Fertility
cg.accessibilitystatusLimited Access

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