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Influence of pre-crop and root architecture on the mobilization of non-exchangeable NH4+

Author

Listed:
  • P. Beuters

    (Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany)

  • T. Eichert

    (Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany)

  • H.W. Scherer

    (Department of Plant Nutrition, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany)

Abstract

It is well established that non-exchangeable NH4+ is an important N source for plants. However, release from clay minerals only occurs when the NH4+ concentration of the mineral environment declines below a certain level. This may be conditioned by the growing plant. Although root development differs depending on plant species, the influence of root architecture on the mobilization of non-exchangeable NH4+ is still open to question. We found that mobilization of non-exchangeable NH4+ was higher under oilseed rape as compared to barley; oilseed rape even has allorhize and fescue homorhize roots. This observation could be proved by labeling soil samples with 15NH4+, which were incubated in soil holders under oilseed rape and barley. The higher mobilization of non-exchangeable NH4+ by oilseed rape is therefore assumed to be caused by higher release of H+, displacing interlayer NH4+. Although allorhize roots from pre-crops create more stable biopores with an increasing diameter and living roots of the subsequent crop enter these biopores, we could not find an influence of the pre-crop on the mobilization of non-exchangeable NH4+.

Suggested Citation

  • P. Beuters & T. Eichert & H.W. Scherer, 2014. "Influence of pre-crop and root architecture on the mobilization of non-exchangeable NH4+," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 60(8), pages 372-378.
    • Handle: RePEc:caa:jnlpse:v:60:y:2014:i:8:id:260-2014-pse
    DOI: 10.17221/260/2014-PSE
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    References listed on IDEAS

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    1. P. Beuters & H.W. Scherer, 2012. "Modification of the standard method for determination of non-exchangeable NH4-N in soil," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(12), pages 557-560.
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