Plant and Soil

, Volume 155, Issue 1, pp 91–94 | Cite as

Mobilization of different phosphate fractions in the rhizosphere

  • A. Jungk
  • B. Seeling
  • J. Gerke


Availability of soil P fractions and mechanisms of acquisition by plants were studied. Plants mobilize soil P by desorption via depletion of P solution concentration around roots. In an oxisol, the process was enhanced by nitrate N nutrition of ryegrass, which increased soil pH, and by carboxylate release by white lupin. Ligand exchange and Fe/Al solubilization are assumed to be the mechanisms. Ammonium N nutrition of ryegrass decreased pH and allowed P mobilization in a luvisol but had no such effect in an oxisol, due to acid solubility of P in these soils. Organic P dissolved in soil solution contributed one third to the P uptake of field-grown barley on a luvisol. Laboratory experiments suggest that organic P is hydrolyzed by phosphatases at the root surface and replenished by micro-organisms.

Key words

barley Ca-P organic P P depletion P fractions P mobilization rhizosphere ryegrass sorbed P white lupin 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Bahadoria P B S, Kaselowsky J, Claassen N and Jungk A 1991. Soil Sci. Soc. Am. J. 55, 56–60.Google Scholar
  2. Barrow N J 1984. J. Soil Sci. 5, 283–297.Google Scholar
  3. Claassen N, Hendriks L and Jungk A 1981. Z. Pflanzenernaehr. Bodenk. 144, 306–316.Google Scholar
  4. Claassen N, Syring K M and Jungk A 1986. Plant and Soil 95, 209–220.Google Scholar
  5. Dinkelaker B, Römheld V and Marschner H 1989. Plant, Cell and Environment 12, 285–292.Google Scholar
  6. Föhse D, Claassen N and Jungk A 1988. Plant and Soil 110, 101–109.Google Scholar
  7. Gahoonia T S, Claassen N and Jungk A 1992. Plant and Soil 140, 241–248.Google Scholar
  8. Gerke J 1992. Z. Pflanzeneraehr. Bodenk. 155, 339–343.Google Scholar
  9. Gerke J, Römer W and Jungk A 1993. Z. Pflanzenernaehr. Bodenk. (submitted).Google Scholar
  10. Hendriks L, Claassen N and Jungk A 1981. Z. Pflanzenernaehr. Bodenk. 144, 486–499.Google Scholar
  11. Jungk A, Asher C J, Edwards D G and Meyer D 1990. Plant and Soil 124, 175–182.Google Scholar
  12. Jungk A, Claassen N Schulz V and Wendt J 1993. Z. Pflanzenernaehr. Bodenk. (in press).Google Scholar
  13. Kuchenbuch R and Jungk A 1982. Plant and Soil 68, 391–394.Google Scholar
  14. Tarafdar J C and Jungk A 1987. Biol. Fertil. Soils 3, 199–204.Google Scholar
  15. Riley D and Barber S A 1971. Soil Sci. Soc. Am. Proc. 35, 301–306.Google Scholar
  16. Seeling B 1992. Ph.D. Thesis University Göttingen.Google Scholar
  17. Seeling B and Jungk A 1992. VDLUFA-Schriftenreihe 35, 147–150.Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • A. Jungk
    • 1
  • B. Seeling
    • 1
  • J. Gerke
    • 1
  1. 1.Institute of Agricultural ChemistryGeorg August UniversityGöttingenGermany

Personalised recommendations