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@ARTICLE{RoblesAguilar:852616,
      author       = {Robles-Aguilar, Ana A. and Pang, Jiayin and Postma,
                      Johannes A. and Schrey, Silvia D. and Lambers, Hans and
                      Jablonowski, Nicolai D.},
      title        = {{T}he effect of p{H} on morphological and physiological
                      root traits of {L}upinus angustifolius treated with struvite
                      as a recycled phosphorus source},
      journal      = {Plant and soil},
      volume       = {434},
      number       = {1-2},
      issn         = {0032-079X},
      address      = {Dordrecht [u.a.]},
      publisher    = {Springer Science + Business Media B.V},
      reportid     = {FZJ-2018-05520},
      pages        = {65-78},
      year         = {2019},
      abstract     = {Aims: Phosphorus (P) recovery from specific waste streams
                      is necessary to develop environmentally sustainable and
                      efficient fertilizers, achieving maximum productivity with
                      minimum losses. A promising example of a P-recovery product
                      is struvite (MgNH4PO4⋅6H2O). Phosphorus availability from
                      struvite is profoundly influenced by soil pH and/or
                      processes in the rhizosphere. Root exudates (e.g., organic
                      anions) and root morphology affect fertilizer
                      bioavailability. The overall objective of our study was to
                      identify root morphological and physiological traits of the
                      narrow-leaf lupine (Lupinus angustifolius L. subsp.
                      angustifolius, cultivar: blau “Boregine”) involved in
                      the acquisition of P from struvite, compared with KH2PO4 as
                      a soluble P source. The study included different pH
                      conditions, as soil pH is one of the main factors affecting
                      P availability.Methods: Narrow-leaf lupine plants were grown
                      in river sand under three pH conditions (4.5, 6.5 and 7.5).
                      Three different P treatment conditions were used: 1) KH2PO4
                      (KP); 2) MgNH4PO4⋅6H2O (Struvite), both supplied at 15 μg
                      P g−1 dry sand; and 3) no P addition (Nil-P), as control.
                      Organic acids in the rhizosheath were collected. Root
                      morphological parameters such as specific root length and
                      root diameter were analyzed.Results: There was no
                      significant difference in total plant biomass detected under
                      any pH condition between struvite and KP treatments. In both
                      acidic and alkaline conditions, the P-uptake efficiency
                      (PUE: mg P plant−1/cm2 root surface area) with struvite
                      was significantly greater than with KP. At neutral pH, there
                      was no difference in PUE between plants supplied with KP or
                      struvite. Plants growing at neutral pH showed greater root
                      exudation of carboxylates (mainly citrate) when struvite was
                      added compared with KP. At alkaline pH, the exudation per
                      unit root surface area was greater than that at acidic or
                      neutral pH. Plants growing in acidic pH had a higher
                      specific root length (SRL) compared with those grown at
                      alkaline or neutral pH.Conclusions: Similar P-uptake
                      efficiency from struvite and KH2PO4 at neutral pH in
                      conjunction with the higher total biomass compared to the
                      Nil-P treatment $(70\%$ higher) suggests very effective
                      mobilization of P from struvite by carboxylate exudation.
                      Application of struvite, while taking into account the
                      different strategies for nutrient mobilization, can increase
                      the use efficiency of this recovered P source.},
      cin          = {IBG-2},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582) / MANUREECOMINE - Green
                      fertilizer upcycling from manure: Technological, economic
                      and environmental sustainability demonstration (603744)},
      pid          = {G:(DE-HGF)POF3-582 / G:(EU-Grant)603744},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000458270300004},
      doi          = {10.1007/s11104-018-3787-2},
      url          = {https://juser.fz-juelich.de/record/852616},
}