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@ARTICLE{Redel:824164,
      author       = {Redel, Y. and Cartes, P. and Demanet, R. and Velásquez, G.
                      and Poblete-Grant, P. and Bol, R. and Mora, M. L.},
      title        = {{A}ssessment of phosphorus status influenced by {A}l and
                      {F}e compounds in volcanic grassland soils},
      journal      = {Journal of soil science and plant nutrition},
      volume       = {16},
      number       = {2},
      issn         = {0717-635X},
      address      = {Temuco},
      reportid     = {FZJ-2016-06785},
      pages        = {490-506},
      year         = {2016},
      abstract     = {Volcanic ash derived soils represent between $50-60\%$ of
                      the total arable land area of southern of Chile, and they
                      are the most important soils for pasture production. In
                      these soils, high phosphorus (P) fixation and, in turn, low
                      P availability and high aluminium (Al) soluble
                      concentrations (at low pH) are the most limiting factors for
                      pasture production. At the same time, the complexes between
                      Al-or iron- (Fe) and organic matter as well as short-range
                      order alumino-silicates (allophane) allow the retention of
                      huge quantities of soil P. The aim of this work was to
                      assess the status of P by both sequential extraction
                      procedure (Hedley) and 31P-NMR analysis as influenced by Al
                      and Fe in volcanic grasslands Andisols (Pemehue, Gorbea,
                      Piedras Negras and Llastuco Soil Series) from Southern
                      Chile. We applied Hedley chemical sequential fractionation
                      to soils in order to examine the potential differences in
                      extractable soil inorganic P (Pi) and organic P (Po)
                      fractions. We also determined total P and Olsen P in these
                      grassland Andisols. Oxalate and pyrophosphate were employed
                      to determine the active and organic matter complexed Al and
                      Fe, respectively. Furthermore, we quantified Al and Fe in
                      extracts of the Hedley P fractions. We found that Al
                      extracted in oxalate was correlated positively with labile
                      Po concentration, specifically with both the
                      NaHCO3-Po(r=0.45, P≤0.01), and the NaOH-Po (r=0.43,
                      P≤0.01) fractions. This observation was reinforced by
                      31P-NMR analysis that showed higher monoester P and myo-IP6
                      content in soils with higher amounts of oxalate Al. Hedley
                      sequential fractionation procedure confirmed the role of Al
                      in the NaOH-Po fraction for promoting Po storage, as both
                      fractions were correlated (r=0.33, P≤0.05). In addition,
                      Fe plays a substantial role in recalcitrant P accumulation
                      as we found a high correlation between residual P and
                      oxalate Fe (r=0.55, P≤0.01).},
      cin          = {IBG-3},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.4067/S0718-95162016005000041},
      url          = {https://juser.fz-juelich.de/record/824164},
}