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@ARTICLE{MenezesBlackburn:902960,
      author       = {Menezes-Blackburn, Daniel and Bol, Roland and Klumpp, Erwin
                      and Missong, Anna and Nischwitz, Volker and Haygarth, Philip
                      M.},
      title        = {{C}itric {A}cid {E}ffect on the {A}bundance, {S}ize and
                      {C}omposition of {W}ater-{D}ispersible {S}oil {C}olloids and
                      {I}ts {R}elationship to {S}oil {P}hosphorus {D}esorption:
                      {A} {C}ase {S}tudy},
      journal      = {Journal of soil science and plant nutrition},
      volume       = {21},
      number       = {3},
      issn         = {0717-635X},
      address      = {[Cham]},
      publisher    = {Springer International Publishing},
      reportid     = {FZJ-2021-04706},
      pages        = {2436 - 2446},
      year         = {2021},
      abstract     = {Citric acid exudation by plant roots is often linked to the
                      mobilisation of recalcitrant soil phosphorus (P) for plant
                      nutrition. In this case study, we have explored the effect
                      of citric acid on the abundance, size and composition of
                      water-dispersible soil colloids (WDC) to understand the
                      mineral source of desorbed P and the chemical nature of
                      P-carrying mobilized colloids. After incubation with citric
                      acid, WDC were isolated using a soil particle-size
                      fractionation method consisting of sedimentation,
                      centrifugation and syringe filtration. The size range and
                      composition of WDC was assessed using field-flow
                      fractionation (FFF), combined with inductively coupled
                      plasma mass spectrometry (ICP-MS) and UV spectrometry, for
                      in vitro P desorption assay samples under the influence of
                      increasing doses of citric acid. Three sharp and
                      well-defined FFF particle size fractions of WDC containing P
                      (12–23, 23–36 and 36–300 nm), with elution times
                      matching carbon (C) peaks and offset from Fe, Al and Si
                      fractions. The concentration of soluble or WDC-associated P,
                      C, Fe, Al and Si increased in response to increasing citric
                      acid doses. Silica colloids were only detected using syringe
                      filtration below 5 µm. The Si, Fe and Al-containing fine
                      colloid fractions (< 600 nm) were positively correlated
                      with P (de)sorption parameters measured by diffusive
                      gradient in thin films in previous work. The P desorbed by
                      citric acid originated predominantly from the disaggregation
                      of Fe and Al oxides and silicate clays. The citric acid
                      effect on mobilizing organic P carrying WDC fractions may
                      increase soil organic P cycling and availability to plants.},
      cin          = {IBG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000663268800001},
      doi          = {10.1007/s42729-021-00534-9},
      url          = {https://juser.fz-juelich.de/record/902960},
}