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@INPROCEEDINGS{Bauer:1017295,
      author       = {Bauer, Felix and Lärm, Lena and Hermes, Normen and
                      Vereecken, Harry and Vanderborght, Jan and Schnepf, Andrea
                      and Klotzsche, Anja},
      title        = {{T}he {S}elhausen {M}inirhizotron {F}acilities: {A}
                      {U}nique {S}et-{U}p to {I}nvestigate {S}ubsoil {P}rocesses
                      within the {S}oil-{P}lant {C}ontinuum},
      reportid     = {FZJ-2023-04033},
      year         = {2023},
      abstract     = {Climate change raises new challenges for agriculture. A
                      comprehensive understanding of whole plant responses to a
                      changing environment is the key to maintain yield and
                      improve sustainable crop production. Although there are many
                      projects approaching this challenge, most studies focus on
                      the acquisition and analysis of above-ground field data. The
                      subsoil processes involved in plant root growth and resource
                      acquisition are rarely in focus, since very complex set-ups
                      are required to obtain these data on field scale. Therefore,
                      detailed measurement of the plant roots and the
                      corresponding soil conditions are required. The
                      minirhizotron facilities in Selhausen (Germany) are located
                      within the TERENO-Selhausen test site in the lower Rhine
                      valley. They enable non-invasive longer-term studies of the
                      soil–plant continuum on two different soils in the same
                      climate by offering a unique set-up to record above- and
                      belowground information over entire crop growing seasons
                      under various field conditions and agronomic treatments.
                      Detailed information about soil water content, soil water
                      potential, soil temperature and root development are
                      collected with a high spatial and temporal resolution.
                      Above-ground measurements, such as biomass, transpiration
                      fluxes and assimilation rates are performed additionally. In
                      recent years, continuous development and improvement of
                      measurement technology and data analysis has facilitated the
                      process, transfer and access to these data. Currently
                      several dynamic and permanently installed sensors are used
                      within the facilities. 7 m-long transparent tubes are
                      horizontally located in several depths. An in-house
                      developed RGB-camera system enables root imaging along the
                      tubes in multiple directions. The images are analyzed with a
                      deep neural network-based analysis pipeline that provides
                      relevant root system traits, such as total root length and
                      root length density. To obtain the spatial soil water
                      content variations per depth, crosshole ground-penetrating
                      radar (GPR) measurements are performed between the tubes.
                      The derived permittivity and hence soil water content values
                      show a clear spatial variation along the tubes and different
                      behaviors for various plant and soil types. Recently, a
                      novel analysis tool to derive the trend‑corrected spatial
                      permittivity deviation was introduced, allowing an
                      investigation of the GPR variability independently of static
                      and dynamic influences.The ongoing measurements currently
                      cover five years of wheat and maize trials, including water
                      stress treatments, sowing density, planting time, and crop
                      mixtures. Data collected in this study are available through
                      the TERENO data portal and can be used to develop,
                      calibrate, and validate models of the soil–plant continuum
                      across different scales, including soil process, root
                      development and root water uptake models, as well as model
                      compilations, such as single-plant and multi-plant models.
                      Further, the data can be of direct use for agronomists and
                      ecologists},
      month         = {Sep},
      date          = {2023-09-25},
      organization  = {TERENO-OZCAR Conference 2023, Bonn
                       (Germany), 25 Sep 2023 - 28 Sep 2023},
      subtyp        = {After Call},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / DFG project 390732324 - EXC 2070: PhenoRob -
                      Robotik und Phänotypisierung für Nachhaltige
                      Nutzpflanzenproduktion (390732324) / Rhizo4Bio (Phase 1):
                      CROP - Kombination von komplementären Wurzelphänotypen
                      für widerstandsfähigere Agrarökosysteme, TP A
                      (031B0909A)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(GEPRIS)390732324 /
                      G:(BMBF)031B0909A},
      typ          = {PUB:(DE-HGF)24},
      doi          = {10.34734/FZJ-2023-04033},
      url          = {https://juser.fz-juelich.de/record/1017295},
}