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@INPROCEEDINGS{Uhlig:1007635,
      author       = {Uhlig, David and Wu, Bei and Berns, Anne E. and Amelung,
                      Wulf},
      title        = {{T}esting {M}g stable isotopes as a potential geochemical
                      tool in agronomy},
      reportid     = {FZJ-2023-02127},
      year         = {2022},
      abstract     = {A sustainable use of soil resources is urgently required to
                      cope with the increasing demand for agricultural products
                      during climate change. Advanced soil cultivation methods
                      like subsoil management were suggested but analytical tools
                      to measure changes in the nutrient use efficiency of crops
                      are still missing. Here we tested the applicability of Mg
                      stable isotopes as novel evaluation tool in agronomy. To
                      this end, we conceptually demonstrated under which
                      conditions changes in the Mg isotope composition (26Mg)
                      of crops and the bioavailable fraction of Mg in soils
                      containing low, middle, and high inventories of exchangeable
                      Mg could be resolved from analytical uncertainty, when
                      simulating subsoil management. We found that shifts in
                      26Mg values are only detectable if i) the crop
                      uptake-related Mg isotope fractionation factor is at the
                      upper end of hitherto published fractionation factors, ii) a
                      high Mg uptake flux of crops is matched by a low Mg supply
                      from the exchangeable fraction, and iii) subsoil management
                      causes a considerable deepening of the rooting system.We
                      tested our concept on field trials, where deep loosening
                      with and without the incorporation of compost was conducted
                      on Luvisols. Shifts in 26Mg values of crops and the
                      exchangeable fraction of Mg in soil were mostly unresolvable
                      from the analytical uncertainty, which positively tested the
                      Mg isotope concept for well nurtured soils. Yet, systematic
                      shifts in 26Mg values among crops cultivated on and
                      beside a melioration strip were found and attributed to the
                      uplift of isotopically distinct compost-derived Mg on the
                      melioration strip and root restricting layers beside the
                      melioration strip. Also, field-based crop uptake-related
                      ‘apparent’ Mg isotope fractionation factors of winter
                      wheat and spring barley were determined, which differed from
                      one another. However, the quantitative approach of Mg
                      isotopes was violated when lime or Mg-carbonate containing
                      fertilizer were applied to the field. In these cases, the
                      isotope-derived difference in the Mg use efficiency were
                      likely caused by the uneven distribution of lime-derived Mg
                      with depth. Hence, using Mg stable isotopes as a new
                      geochemical routine for agronomy will require further work
                      to allow low-demanding, minimally invasive sampling of the
                      soil-plant system.},
      month         = {Jul},
      date          = {2022-07-10},
      organization  = {Goldschmidt Hawaii 2022, Honolulu
                       (USA), 10 Jul 2022 - 15 Jul 2022},
      subtyp        = {Other},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / BonaRes - (Modul A, Phase 2): Soil3-II -
                      Nachhaltiges Unterbodenmanagement, Teilprojekt C
                      (031B0515C)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(BMBF)031B0515C},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1007635},
}