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@INPROCEEDINGS{Uhlig:1007634,
      author       = {Uhlig, David and Wu, Bei and Berns, Anne E. and Amelung,
                      Wulf},
      title        = {{A}re magnesium stable isotopes a valuable geochemical tool
                      in agronomy?},
      reportid     = {FZJ-2023-02126},
      year         = {2022},
      abstract     = {A sustainable use of soil resources is urgently required to
                      cope with the increasing demand for agricultural products.
                      Advanced soil cultivation methods like subsoiling 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 and validated our results with
                      the nutrient uptake depth proxy 87Sr/86Sr.First, we
                      conceptually demonstrated under which conditions changes in
                      the Mg isotope composition (26Mg) of crops and the
                      bioavailable fraction of Mg could be resolved from
                      analytical uncertainty, when simulating subsoiling on soils
                      with distinct Mg supply. Shifts in 26Mg values are only
                      detectable if i) the crop uptake-related Mg isotope
                      fractionation factor is high, ii) a high Mg uptake flux of
                      crops faces a low Mg supply in soil, and iii) subsoiling
                      causes a considerable deepening of the nutrient uptake
                      depth.Second, we tested our concept on field trials, where
                      deep loosening with and without compost incorporation was
                      conducted. Although 87Sr/86Sr indicates a deepening of the
                      nutrient uptake depth after subsoiling with compost, shifts
                      in 26Mg values of crops and the exchangeable fraction
                      were mostly unresolvable from the analytical uncertainty.
                      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. Still, Mg stable isotopes represent a
                      valuable tool towards nutrient use efficiency measures on
                      soils with low Mg supply, unless agricultural lime is
                      applied.},
      month         = {Sep},
      date          = {2022-09-11},
      organization  = {GeoMinKöln 2022, Köln (Germany), 11
                       Sep 2022 - 15 Sep 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/1007634},
}