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@INPROCEEDINGS{RoblesAguilar:851802,
      author       = {Robles Aguilar, Ana Alejandra and Grunert, Oliver and
                      Schrey, Silvia and Boon, Nico and Jablonowski, Nicolai
                      David},
      title        = {{M}odification of {R}oot {A}ssociated {B}acteria, {R}oot
                      {A}rchitecture and {P}h as {R}esponse to the {N}itrogen
                      {S}ource {A}pplied in {T}omato},
      reportid     = {FZJ-2018-05305},
      year         = {2018},
      abstract     = {Crops often show plasticity in their root morphology and
                      physiology to environmental changes that can influence the
                      soil nutrient availability. Likewise, the application of
                      mineral or organic fertilizers can lead to chemical changes
                      in the soil that may affect the biological properties like
                      the abundance of ammonia-oxidizing bacteria and nitrite
                      oxidizing bacteria that are the most important organisms
                      responsible for critical steps in the soil nitrogen cycle.
                      Our objective was to measure the dynamic response of plants
                      and root-associated bacteria to the nitrogen source applied,
                      via invasive and non-invasive quantification of the
                      rhizosphere processes. We compared the effect of organic
                      source of nitrogen (amino acids) with an inorganic source
                      (struvite, a recovered product from manure) on root
                      architecture of tomato (Solanum licopersicum). The
                      experiment was conducted in rhizotrons (allowing
                      visualization of roots), including planar optodes for
                      non-invasive in situ measurements of pH dynamics in the
                      rhizosphere. Further, the effect of the fertilizers on the
                      bacterial communities in the rhizosphere and the bulk soil
                      was analyzed by high throughput sequencing analysis.
                      Fertilizer type had a significant effect on total root
                      length and the ratio of primary to secondary, increasing the
                      secondary root growth in tomato with the organic nitrogen.
                      The pH monitoring in the rhizosphere zone via optodes
                      revealed that the organic fertilizer increased rhizosphere
                      pH for short time duration. It is hypothesized that the
                      increase of pH was due to co-uptake of protons from the
                      substrate when tomato uptake the nitrate, which is
                      consistent with low nitrate concentration measured in the
                      substrate at harvest. The diversity measurements of
                      microbial community were significantly different between
                      fertilizers and between rhizosphere and rhizosheath
                      (substrate directly attached to the root). Those results
                      might explain the higher nitrification activity and the
                      highest relative AOB abundance found in combination with the
                      organic fertilizer compared to struvite.},
      month         = {Jul},
      date          = {2018-07-08},
      organization  = {International Sociaty of Root Research
                       Conference, Jersusalem (Israel), 8 Jul
                       2018 - 12 Jul 2018},
      subtyp        = {After Call},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582) / BioSC - Bioeconomy Science
                      Center (BioSC)},
      pid          = {G:(DE-HGF)POF3-582 / G:(DE-Juel1)BioSC},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/851802},
}