Sulphur immobilization and availability in soils assessed using isotope dillution
cg.authorship.types | CGIAR and advanced research institute | en |
cg.contributor.affiliation | Katholieke Universiteit Leuven | en |
cg.contributor.affiliation | International Institute of Tropical Agriculture | en |
cg.contributor.affiliation | Columbia University | en |
cg.coverage.country | Belgium | |
cg.coverage.country | Kenya | |
cg.coverage.country | Colombia | |
cg.coverage.iso3166-alpha2 | BE | |
cg.coverage.iso3166-alpha2 | KE | |
cg.coverage.iso3166-alpha2 | CO | |
cg.coverage.region | ACP | |
cg.coverage.region | Africa | |
cg.coverage.region | Europe | |
cg.coverage.region | Eastern Africa | |
cg.coverage.region | South America | |
cg.coverage.region | Western Europe | |
cg.identifier.doi | https://doi.org/10.1016/j.soilbio.2004.09.007 | en |
cg.isijournal | ISI Journal | en |
cg.issn | 0038-0717 | en |
cg.issue | 4 | en |
cg.journal | Soil Biology and Biochemistry | en |
cg.reviewStatus | Peer Review | en |
cg.subject.iita | PLANT BREEDING | en |
cg.subject.iita | LIVELIHOODS | en |
cg.subject.iita | BIOSCIENCE | en |
cg.subject.iita | CROP SYSTEMS | en |
cg.subject.iita | INTEGRATED SOIL FERTILITY MANAGEMENT | en |
cg.subject.iita | GENETIC IMPROVEMENT | en |
cg.subject.iita | HANDLING, TRANSPORT, STORAGE AND PROTECTION OF AGRICULTURAL PRODUCTS | en |
cg.subject.iita | PESTS OF PLANTS | en |
cg.subject.iita | PLANT GENETIC RESOURCES | en |
cg.volume | 37 | en |
dc.contributor.author | Nziguheba, Generose | en |
dc.contributor.author | Smolders, E. | en |
dc.contributor.author | Merckx, Roel | en |
dc.date.accessioned | 2018-03-23T06:48:58Z | en |
dc.date.available | 2018-03-23T06:48:58Z | en |
dc.identifier.uri | https://hdl.handle.net/10568/91891 | |
dc.title | Sulphur immobilization and availability in soils assessed using isotope dillution | en |
dcterms.abstract | Increasing 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.accessRights | Limited Access | |
dcterms.bibliographicCitation | Nziguheba, 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.extent | p. 635-644 | en |
dcterms.issued | 2005-04 | |
dcterms.language | en | |
dcterms.license | Copyrighted; all rights reserved | |
dcterms.publisher | Elsevier | en |
dcterms.subject | e value | en |
dcterms.subject | immobilization | en |
dcterms.subject | l value | en |
dcterms.subject | mineralization | en |
dcterms.subject | radioactive s | en |
dcterms.subject | ryegrass | en |
dcterms.subject | sulphate fertilization | en |
dcterms.subject | incubation | en |
dcterms.type | Journal Article |