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    Sulphur immobilization and availability in soils assessed using isotope dillution

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    S05ArtNziguhebaSulphurInthomNodev.pdf (286.6Kb)
    Date
    2005
    Author
    Nziguheba, Generose
    Smolders, E.
    Merckx, R.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    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.
    https://dx.doi.org/10.1016/j.soilbio.2004.09.007
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3373
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.soilbio.2004.09.007
    IITA Subjects
    Plant Breeding; Livelihoods; Bioscience; Crop Systems; Integrated Soil Fertility Management; Genetic Improvement; Handling, Transport, Storage And Protection Of Agricultural Products; Pests Of Plants; Plant Genetic Resources
    Agrovoc Terms
    E Value; Immobilization; L Value; Mineralization; Radioactive S; Ryegrass; Sulphate Fertilization; Incubation
    Regions
    Acp; Africa; Europe; East Africa; South America
    Countries
    Belgium; Kenya; Colombia
    Collections
    • Journal and Journal Articles4835
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