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Phosphorus depletion controls Cu and Zn biogeochemistry in canola and corn rhizosphere on a calcareous soil

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  • Alireza Golestanifard

    (Institute for Soil Research, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria
    Soil Science Department, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
    Institute of Agronomy, University of Natural Resources and Life Sciences Vienna,)

  • Markus Puschenreiter

    (Institute for Soil Research, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria)

  • Amal Aryan

    (Institute for Soil Research, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria)

  • Walter W. Wenzel

    (Institute for Soil Research, University of Natural Resources and Life Sciences Vienna, Tulln an der Donau, Austria)

Abstract

Phosphorus (P) deficiency may trigger rhizodeposition, including protons and organic compounds, with possible effects on metal solubility and speciation. To explore the relevance of this process, we investigated biogeochemical changes in the rhizosphere of P-deficient canola (Brassica napus L.) and corn (Zea mays L.) cultivars grown in a pot experiment on calcareous soil. Depletion of total soluble (0.005 mol/L Ca(NO3)2-extractable) P in the rhizosphere varied with crop species and cultivar but was generally strong and negatively correlated with dissolved organic carbon (DOC) in canola (R2 = 0.868) and corn (R2 = 0.844) rhizospheres, indicating rhizodeposition in response to limited P availability. DOC was correlated with dissolved Cu, explaining 86% of its variation in the rhizosphere and bulk soil solution of canola and corn cultivars, respectively, suggesting Cu mobilisation via the formation of Cu-organic complexes. In line with lower Zn-organic complex stabilities, the effect of rhizodeposition was less pronounced for Zn mobilisation. We show that the P nutritional status of plants and the related variation of rhizodeposition among crops and cultivars represents a major control of metal solubility in soil, with possible effects on micronutrient supply and toxicity. Hence, targeted P availability control should be considered in the management of polluted and micronutrient-deficient soils.

Suggested Citation

  • Alireza Golestanifard & Markus Puschenreiter & Amal Aryan & Walter W. Wenzel, 2021. "Phosphorus depletion controls Cu and Zn biogeochemistry in canola and corn rhizosphere on a calcareous soil," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 67(8), pages 443-452.
    • Handle: RePEc:caa:jnlpse:v:67:y:2021:i:8:id:122-2021-pse
    DOI: 10.17221/122/2021-PSE
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