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Mehlich 3 extractant used for the evaluation of wheat-available phosphorus and zinc in calcareous soils

Author

Listed:
  • Ondřej SEDLÁŘ
  • Jiří BALÍK

    (Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Martin KULHÁNEK

    (Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Jindřich ČERNÝ

    (Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Milan KOS

    (Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

Relation between wheat (Triticum aestivum) nutritional status determined at the beginning of stem elongation and during anthesis, respectively, and available content of phosphorus (P-M3) and zinc (Zn-M3) determined by the Mehlich 3 extractant was studied. Both one-year pot experiment with spring wheat and two-year on-farm trials with winter wheat were run on various calcareous soils (pH values of 7.18-7.94, median 7.80, P-M3 1-289 ppm, median 54, and Zn-M3 2-14 ppm, median 4), in the Czech Republic (Central Europe). Phosphorus nutrition index (ratio of phosphorus concentration in shoot biomass to critical phosphorus concentration - Pc) was calculated using the Belanger et al.'s model: Pc = -0.677 + 0.221N - 0.00292N(2), where both phosphorus and nitrogen concentrations were expressed in g/kg shoot dry matter. Unlike phosphorus concentration in shoot biomass, phosphorus nutrition index significantly correlated with P-M3 content in soil. Optimal values of the phosphorus nutrition index were recorded if P-M3 was 51-68 ppm. Zinc concentration in shoot biomass more strongly correlated with P:Zn ratio (M3) in soil compared to Zn-M3 content in soil. P:Zn ratio in shoot biomass of 130:1 did not lead to phosphorus deficiency and corresponded to P:Zn (M3) ratio in soil of 9.3:1-14.3:1.

Suggested Citation

  • Ondřej SEDLÁŘ & Jiří BALÍK & Martin KULHÁNEK & Jindřich ČERNÝ & Milan KOS, 2018. "Mehlich 3 extractant used for the evaluation of wheat-available phosphorus and zinc in calcareous soils," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(2), pages 53-57.
    • Handle: RePEc:caa:jnlpse:v:64:y:2018:i:2:id:691-2017-pse
    DOI: 10.17221/691/2017-PSE
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