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

P. Beuters, T. Eichert and H.W. Scherer
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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

Plant, Soil and Environment, 2014, vol. 60, issue 8, 372-378

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+.

Keywords: ammonium; fixation; availability; roots; biopores (search for similar items in EconPapers)
Date: 2014
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DOI: 10.17221/260/2014-PSE

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