Labile soil phosphorus as influenced by methods of applying radioactive phosphorus

V.V. Selvaratnam, S. Sümer, A.J. Andersen, J.D. Thomsen, Gunnar Gissel Nielsen

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    The influence of different methods of applying radioactive phosphorus on the E- and L-values was studied in four foil types using barley, buckwheat, and rye grass for the L-value determination. The four soils differed greatly in their E- and L-values. The experiment was carried out both with and without carrier-P. The presence of carrier-P had no influence on the E-values, while carrier-P in some cases gave a lower Lvalue. Both E- and L-values depended on the method of application. When the 32P was applied on a small soil or sand sample and dried before mixing with the total amount of soil, the E-values were higher than at direct application most likely because of a stronger fixation to the soil/sand particles. This was not the case for the L-values that are based on a much longer equilibrium time. On the contrary, the direct application of the 32p-solution to the whole amount of soil gave higher L-values of a non-homogeneous distribution of the 32P in the soil.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherRisø National Laboratory
    Number of pages21
    ISBN (Print)87-550-0679-5
    Publication statusPublished - 1980
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Risø-R-409


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