Plant Soil Environ., 2021, 67(7):367-375 | DOI: 10.17221/458/2020-PSE

Characterisation of soil phosphorus forms in the soil-plant system using radioisotopic tracer methodOriginal Paper

Andrea Balla Kovács*,1, Rita Kremper1, János Kátai1, Imre Vágó ORCID...1, Dóra Buzetzky2, Eszter Mária Kovács2, József Kónya2, Noémi M. Nagy2
1 Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
2 ImreLajos Isotope Laboratory, Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary

Soil incubation and pot experiments were conducted to follow the sorption processes of added phosphorus (P) fertiliser using the radioisotope tracer technique. Increasing doses of P fertiliser (40, 80, 160, 320 mg P/kg soil) were added to Chernozem and Arenosol and incubated for 1, 3, and 13 weeks. After incubation, perennial ryegrass (Lolium perenne L.) was sown in one group of pots, and the experiment had been continuing for another 9 weeks. The yield, grass P uptake, isotopically exchangeable (PIE), water-soluble (PW), and ammonium lactate soluble phosphorus (PAL) fractions of soils were measured. On Chernozem, plant P uptake, PIE, PW and PAL were significantly less in the case of the longest incubation period compared to shorter incubations. This suggests a transformation of P into tightly sorbed form. On Arenosol, there were only small changes in the parameters as the incubation period increased, suggesting less intense P transformation to tightly sorbed form. The PW/PIE ratio enhanced with increasing P-doses, and the ratios were higher on Arenosol. On Arenosol, the higher P doses caused a greater increase of PW than on Chernozem. The PIE + PW showed a good correlation with plant P uptake proving this value can be a good indicator of plant-available phosphorus.

Keywords: heterogeneous isotope exchange; 32P-labeled phosphate; plant nutrient; P cycling; adsorption; bioavailability

Published: July 31, 2021  Show citation

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Balla Kovács A, Kremper R, Kátai J, Vágó I, Buzetzky D, Kovács EM, et al.. Characterisation of soil phosphorus forms in the soil-plant system using radioisotopic tracer method. Plant Soil Environ.. 2021;67(7):367-375. doi: 10.17221/458/2020-PSE.
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