| dc.contributor.author | Nziguheba, Generose |
| dc.contributor.author | Smolders, E. |
| dc.contributor.author | Merckx, R. |
| dc.date.accessioned | 2019-12-04T11:19:00Z |
| dc.date.available | 2019-12-04T11:19:00Z |
| dc.date.issued | 2005 |
| dc.identifier.citation | 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. |
| dc.identifier.issn | 0038-0717 |
| dc.identifier.uri | https://hdl.handle.net/20.500.12478/3373 |
| dc.description.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. |
| dc.language.iso | en |
| dc.subject | E Value |
| dc.subject | Immobilization |
| dc.subject | L Value |
| dc.subject | Mineralization |
| dc.subject | Radioactive S |
| dc.subject | Ryegrass |
| dc.subject | Sulphate Fertilization |
| dc.subject | Incubation |
| dc.title | Sulphur immobilization and availability in soils assessed using isotope dillution |
| dc.type | Journal Article |
| dc.description.version | Peer Review |
| cg.contributor.affiliation | Katholieke Universiteit Leuven |
| cg.contributor.affiliation | International Institute of Tropical Agriculture |
| cg.contributor.affiliation | Columbia University |
| cg.coverage.region | Acp |
| cg.coverage.region | Africa |
| cg.coverage.region | Europe |
| cg.coverage.region | East Africa |
| cg.coverage.region | South America |
| cg.coverage.country | Belgium |
| cg.coverage.country | Kenya |
| cg.coverage.country | Colombia |
| cg.isijournal | ISI Journal |
| cg.authorship.types | CGIAR and advanced research institute |
| cg.iitasubject | Plant Breeding |
| cg.iitasubject | Livelihoods |
| cg.iitasubject | Bioscience |
| cg.iitasubject | Crop Systems |
| cg.iitasubject | Integrated Soil Fertility Management |
| cg.iitasubject | Genetic Improvement |
| cg.iitasubject | Handling, Transport, Storage And Protection Of Agricultural Products |
| cg.iitasubject | Pests Of Plants |
| cg.iitasubject | Plant Genetic Resources |
| cg.accessibilitystatus | Limited Access |
| local.dspaceid | 95047 |
| cg.identifier.doi | https://dx.doi.org/10.1016/j.soilbio.2004.09.007 |
