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@INPROCEEDINGS{Mukherjee:172401,
      author       = {Mukherjee, Santanu and Tappe, Wolfgang and Hofmann, Diana
                      and Köppchen, Stephan and Disko, Ulrich and Weihermüller,
                      Lutz and Burauel, Peter and Vereecken, Harry},
      title        = {{E}ffect of biochar and digestate on microbial respiration
                      and pesticidedegradation},
      journal      = {Geophysical research abstracts},
      volume       = {16},
      issn         = {1607-7962},
      address      = {Katlenburg-Lindau},
      publisher    = {Soc.},
      reportid     = {FZJ-2014-05881},
      pages        = {20},
      year         = {2014},
      abstract     = {To overcome the problem of on farm point sources of
                      pollution stemming from improper handling, spillages,and
                      leakages of pesticides during filling and cleaning of
                      spraying equipment, environmental friendly and lowcost
                      technology filter systems are currently under development.
                      Based on a laboratory screening approach, wheredifferent
                      biomixtures (soil, with biochar and/or digestate) are tested
                      a full scale outdoor system will be developed.Therefore,
                      different fundamental processes like pesticide
                      mineralization, metabolization, sorption-desorption,
                      andtransport behavior of three radiolabelled pesticides
                      (Bentazone, Boscalid and Pyrimethanil) will be
                      investigated.Biochar and digestate mixtures with two
                      contrasting soils (sandy and silt loam) had been used as a
                      novel biofiltermaterial for respiration study instead of
                      conventional soil and straw mixtures. To analyze the
                      pesticide degradationpotential and to gain information about
                      the temporal evolution of the degradation process of the
                      biochar anddigestate soil mixtures microbial respiration was
                      measured over the course of three month. As expected,
                      digestateacts as an easily available C-source leading to
                      highest release of CO2 compared to other biomixtures used.
                      Incontrast, the addition of even small amounts (1 $\%)$ of
                      biochar caused a profound suppression in the CO2 releasefrom
                      digestate based mixtures. The exact driving mechanism for
                      this suppression can be manifold likes negativepriming or
                      chemisorption of CO2 on biochar or NH3 toxicity induced by
                      the large amount of digestate appliedin the experiment (30
                      $\%)$ or can be combination of all effects. Surprisingly, a
                      repeated experiment with same butaged digestate did not show
                      such negative priming.On the other hand, the fate of applied
                      organic contaminants to biomixtures depends on several
                      factors likesoil properties and climatic conditions as well
                      as biological degradation. To analyze the degradation
                      potentialof the different soil/amendment mixtures a
                      degradation study was performed to determine the effects of
                      biocharand digestate in different mixing rates on the
                      metabolization behavior of the studied pesticides, and to
                      identifyand quantify the metabolites derived during the
                      degradation process. The results from the 14C Bentazone
                      studyindicate that 5 $\%$ digestate and 5 $\%$ biochar
                      mixture showed highest (nearly 15 $\%)$ and 1 $\%$ biochar
                      lowest rateof mineralization (1 $\%),$ whereby highest
                      microbial activity was measured in the soil/digestate
                      mixture.},
      month         = {Apr},
      date          = {2014-04-27},
      organization  = {EGU General Assembly 2014, Wien
                       (Österreich), 27 Apr 2014 - 2 May
                       2014},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {245 - Chemicals in the Environment (POF2-245) / 255 -
                      Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF2-245 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)1 / PUB:(DE-HGF)16},
      url          = {https://juser.fz-juelich.de/record/172401},
}