Description of the phosphorus sorption and desorption processes in lowland peaty clay soils

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    Abstract

    To determine phosphorus (P) losses from agricultural land to surface water, information is needed about the behavior of P in soils. In this study, the sorption and desorption characteristics of lowland peaty clay soils are described based on experimental laboratory studies. The maximum P sorption capacity is comparable to that of acid sandy soils if based on the amount of oxalate-extractable aluminum and iron. A fraction of the maximum amount of sorbed P is bound reversibly (Q), which can be measured with an iron-impregnated paper. The fraction of the maximum reversibly sorbed P depends on the amount of oxalate-extractable aluminum and iron. In the topsoil, the maximum of the fraction of reversibly bound P (Qm) is about one third of maximum P sorption capacity; and in the subsoil, about two thirds. All sorption and desorption parameters are related to soil characteristics of peat samples.
    Original languageEnglish
    Pages (from-to)291-300
    JournalSoil Science
    Volume178
    Issue number6
    DOIs
    Publication statusPublished - 2013

    Keywords

    • semiarid altered wetland
    • acid soils
    • phosphate adsorption
    • agricultural land
    • organic-matter
    • flooded soils
    • iron-oxides
    • sandy soil
    • aluminum
    • release

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