Nitrogen recoveries from organic amendments in crop and soil assessed by isotope techniques under tropical field conditions

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cg.coverage.countryNicaragua
cg.coverage.iso3166-alpha2NI
cg.coverage.regionCentral America
cg.coverage.regionLatin America
cg.creator.identifierSabine Douxchamps: 0000-0002-5286-0753
cg.creator.identifierRein van der Hoek: 0000-0003-4528-7669
cg.creator.identifierIdupulapati M. Rao: 0000-0002-8381-9358
cg.identifier.doihttps://doi.org/10.1007/s11104-010-0633-6en
cg.isijournalISI Journalen
cg.issn1573-5036en
cg.issue1-2en
cg.journalPlant and Soilen
cg.reviewStatusPeer Reviewen
cg.subject.ciatSOIL HEALTHen
cg.subject.ciatTROPICAL FORAGESen
cg.subject.ilriFORAGESen
cg.volume341en
dc.contributor.authorDouxchamps, Sabineen
dc.contributor.authorFrossard, Emmanuelen
dc.contributor.authorBernasconi, Sen
dc.contributor.authorHoek, Rein van deren
dc.contributor.authorSchmidt, A.en
dc.contributor.authorRao, Idupulapati M.en
dc.contributor.authorOberson, Astriden
dc.date.accessioned2014-10-02T08:32:54Zen
dc.date.available2014-10-02T08:32:54Zen
dc.identifier.urihttps://hdl.handle.net/10568/43894
dc.titleNitrogen recoveries from organic amendments in crop and soil assessed by isotope techniques under tropical field conditionsen
dcterms.abstractThe integration of multipurpose legumes into low-input tropical agricultural systems is needed because they are a nitrogen (N) input through symbiotic fixation. The drought-tolerant cover legume canavalia (Canavalia brasiliensis) has been introduced for use either as forage or as a green manure into the crop-livestock system of the Nicaraguan hillsides. To evaluate its impact on the subsequent maize crop, an in-depth study on N dynamics in the soil-plant system was conducted. Microplots were installed in a 6-year old field experiment with maize-canavalia rotation. Direct and indirect 15N-labelling techniques were used to determine N uptake by maize from canavalia residues and canavalia-fed cows manure compared to mineral fertilizer. Litter bags were used to determine the N release from canavalia residues. The incorporation of N from the amendment into different soil N pools (total N, mineral N, microbial biomass) was followed during the maize cropping season. Maize took up an average of 13.3 g?N?m?2, within which 1.0 g?N?m?2 was from canavalia residues and 2.6 g?N?m?2 was from mineral fertilizer, corresponding to an amendment N recovery of 12% and 32%, respectively. Recoveries in maize would probably be higher at a site with lower soil available N content. Most of the amendment N remained in the soil. Mineral N and microbial N were composed mainly of N derived from the soil. Combined total 15N recovery in maize and soil at harvest was highest for the canavalia residue treatment with 98% recovery, followed by the mineral fertilizer treatment with 83% recovery. Despite similar initial enrichment of soil microbial and mineral N pools, the indirect labelling technique failed to assess the N fertilizer value of mineral and organic amendments due to a high N mineralization from the soil organic matter.en
dcterms.accessRightsLimited Access
dcterms.available2010-11-16
dcterms.extentpp. 179-192en
dcterms.issued2011-04
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherSpringeren
dcterms.subjectfeed cropsen
dcterms.subjectcanavaliaen
dcterms.subjectnitrogen fixationen
dcterms.subjectorganic amendmentsen
dcterms.subjectanimal feedingen
dcterms.subjectisotopesen
dcterms.subjectnitrogenen
dcterms.subjectmaizeen
dcterms.subjectfijación del nitrógenoen
dcterms.subjectplantas forrajerasen
dcterms.subjectenmiendas organicasen
dcterms.subjectalimentación de los animalesen
dcterms.subjectisótoposen
dcterms.subjectnitrógenoen
dcterms.subjectmaízen
dcterms.typeJournal Article

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