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

Andrea Balla Kovács, Rita Kremper, János Kátai, Imre Vágó, Dóra Buzetzky, Eszter Mária Kovács, József Kónya and Noémi M. Nagy
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Andrea Balla Kovács: Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
Rita Kremper: Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
János Kátai: Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
Imre Vágó: Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary
Dóra Buzetzky: ImreLajos Isotope Laboratory, Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary
Eszter Mária Kovács: ImreLajos Isotope Laboratory, Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary
József Kónya: ImreLajos Isotope Laboratory, Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary
Noémi M. Nagy: ImreLajos Isotope Laboratory, Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary

Plant, Soil and Environment, 2021, vol. 67, issue 7, 367-375

Abstract: 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 (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:67:y:2021:i:7:id:458-2020-pse

DOI: 10.17221/458/2020-PSE

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