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@INPROCEEDINGS{BarbosaLeal:256134,
      author       = {Barbosa Leal, Daniela and Blossfeld, Stephan and
                      Jablonowski, Nicolai David},
      title        = {{M}aize nutrient uptake, rhizosphere p{H} and root
                      architecture affected by soil compaction and application of
                      biogas-digestate},
      reportid     = {FZJ-2015-06143},
      year         = {2015},
      abstract     = {Application of biogas-residues as fertilizers may promote
                      enhanced cycling of nutrient resources. Plants obtain water
                      and mineral nutrients from the soil due their capacity to
                      develop extensive root systems. However, soil compaction may
                      restrict deep root growth. Thus, we evaluated the effects of
                      the biogas-digestate applied as a fertilizer on root
                      architecture, rhizosphere pH, nutrient uptake and biomass
                      development of maize growth when subjected to soil
                      compaction, in comparison to NPK fertilizer application and
                      noncompacted soil condition. Experimental factors were:
                      fertilizers - biogas-digestate (40 Mg ha-1), NPK (equivalent
                      amount) and biogas-digestate (20 Mg ha-1) + NPK (equivalent
                      amount); and soil compaction or non-compaction. The upper
                      compacted layer (25 cm) received an equivalent pressure of
                      1.2 kg cm2. The biogas-digestate (elemental composition:
                      $41.1\%$ C, $3.2\%$ N, $1.5\%$ P and $3.8\%$ K) was composed
                      of maize silage as the major feedstock, and minor amounts of
                      chicken manure. Fertilizers were mixed into the soil
                      $(50\%v.$ arable field soil + $50\%v.$ peat substrate).
                      Plants were grown for 28 days under greenhouse conditions
                      (16h per day of light period, day/night temperature of
                      22°C/17°C and $60\%$ of humidity). At harvest,the
                      measurements included: shoot and root dry mass and nutrients
                      content (C, N, P and K); leaf area; root architecture; and
                      soil elemental analyses. Rhizosphere pH was measured with
                      planar optodes along the experimental period. Preliminary
                      results showed variation of the rhizosphere pH along the
                      experimental period for all treatments. The lowest
                      rhizosphere pH (4.2) was observed for the biogas-digestate +
                      NPK/soil compaction treatment and the highest rhizosphere pH
                      (5.3) was observed for the NPK/soil compaction treatment.
                      Similar shoot and root biomass and nutrient uptake were
                      observed between the treatments. Thesefindings can enhance
                      our understanding of rhizosphere pH dynamics and root
                      architecture subjected to soil compaction aiming to improve
                      soil fertilization practices.},
      month         = {Jun},
      date          = {2015-06-21},
      organization  = {Rhizosphere 4, Maastricht
                       (Netherlands), 21 Jun 2015 - 25 Jun
                       2015},
      subtyp        = {After Call},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/256134},
}