Sulphur immobilization and availability in soils assessed using isotope dillution

cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationKatholieke Universiteit Leuvenen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationColumbia Universityen
cg.coverage.countryBelgium
cg.coverage.countryKenya
cg.coverage.countryColombia
cg.coverage.iso3166-alpha2BE
cg.coverage.iso3166-alpha2KE
cg.coverage.iso3166-alpha2CO
cg.coverage.regionACP
cg.coverage.regionAfrica
cg.coverage.regionEurope
cg.coverage.regionEastern Africa
cg.coverage.regionSouth America
cg.coverage.regionWestern Europe
cg.identifier.doihttps://doi.org/10.1016/j.soilbio.2004.09.007en
cg.isijournalISI Journalen
cg.issn0038-0717en
cg.issue4en
cg.journalSoil Biology and Biochemistryen
cg.reviewStatusPeer Reviewen
cg.subject.iitaPLANT BREEDINGen
cg.subject.iitaLIVELIHOODSen
cg.subject.iitaBIOSCIENCEen
cg.subject.iitaCROP SYSTEMSen
cg.subject.iitaINTEGRATED SOIL FERTILITY MANAGEMENTen
cg.subject.iitaGENETIC IMPROVEMENTen
cg.subject.iitaHANDLING, TRANSPORT, STORAGE AND PROTECTION OF AGRICULTURAL PRODUCTSen
cg.subject.iitaPESTS OF PLANTSen
cg.subject.iitaPLANT GENETIC RESOURCESen
cg.volume37en
dc.contributor.authorNziguheba, Generoseen
dc.contributor.authorSmolders, E.en
dc.contributor.authorMerckx, Roelen
dc.date.accessioned2018-03-23T06:48:58Zen
dc.date.available2018-03-23T06:48:58Zen
dc.identifier.urihttps://hdl.handle.net/10568/91891
dc.titleSulphur immobilization and availability in soils assessed using isotope dillutionen
dcterms.abstractIncreasing recognition of S deficiency in soils has raised the need for understanding processes governing S cycling and availability in soils. However, the quantification of the two main processes of S cycling, i.e. mineralization and immobilization, remains difficult as these processes occur simultaneously. A modified isotope 35SO4 dilution technique was developed and used to measure the effect of sulphate (SO4) fertilization on S mineralization and immobilization in planted (pot experiment with ryegrass (Lolium multiflorum L.)) and unplanted soils (incubation). The immobilization and mineralization of S was calculated from the dynamics of stable and labelled S in soil KH2PO4 extracts containing an anion exchange membrane that concentrates SO4 and mainly excludes other S species. The mathematical analysis of the isotope dilution data differs from methods proposed earlier. The radiolabile S in unplanted soil (E value) and in ryegrass (L value) were used as a measure of total available S in soils. Sulphate immobilization rate significantly declined during incubation. Sulphate application reduced gross mineralization but surprisingly reduced SO4 immobilization. The E value significantly increased during the incubation in all soils as a result of gross mineralization, e.g. from 3.8 mg S kg−1 at day 0 to 11.5 mg S kg−1 at day 43 in the sandy soil with no sulphate addition. A full recovery in the E value of S added in (+S) treatments was achieved. Similarly, radiolabile S in the above-ground ryegrass biomass (L value) increased with S addition, with a full recovery of added S. The E and L values nearly fit a 1:1 line suggesting identical S dynamics in a planted and unplanted soil. The method proposed has operational advantages compared to methods used earlier.en
dcterms.accessRightsLimited Access
dcterms.bibliographicCitationNziguheba, G., Smolders, E. & Merckx, R. (2005). Sulphur immobilization and availability in soils assessed using isotope dilution. Soil Biology and Biochemistry, 37(4), 635-644.en
dcterms.extentp. 635-644en
dcterms.issued2005-04
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherElsevieren
dcterms.subjecte valueen
dcterms.subjectimmobilizationen
dcterms.subjectl valueen
dcterms.subjectmineralizationen
dcterms.subjectradioactive sen
dcterms.subjectryegrassen
dcterms.subjectsulphate fertilizationen
dcterms.subjectincubationen
dcterms.typeJournal Article

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