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@ARTICLE{SHAO:888982,
      author       = {SHAO, Ze-qiang},
      collaboration = {Zheng, Congcong},
      othercontributors = {Postma, Johannes Auke},
      title        = {{N}itrogen acquisition, fixation and transfer in
                      alfalfa-maize intercrops are increased through root contact
                      and morphology responses tointerspecies competition},
      journal      = {Journal of integrative agriculture},
      volume       = {20},
      number       = {8},
      issn         = {2095-3119},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2020-05369},
      pages        = {2240-2254},
      year         = {2020},
      abstract     = {Nitrogen (N) fixation by legumes and nitrogen transfer to
                      cereals have been considered as important pathways for
                      overyielding and higher N use efficiency in cereal/legume
                      intercropping systems. However, the extent to which root
                      morphology contributes to N fixation and transfer is
                      unclear. A two-factorial greenhouse experiment was conducted
                      to quantify the N fixation, transfer and root morphology
                      characteristics of the maize/alfalfa intercropping system in
                      two consecutive years using the 15N-urea leaf labeling
                      method, and combining two N levels with three root
                      separation techniques. N application could inhibit N
                      fixation and transfer in a maize/alfalfa intercropping
                      system. Irrespective of the N application level, compared
                      with plastic sheet separation (PSS), no separation (NS) and
                      nylon mesh separation (NNS) significantly increased the
                      total biomass $(36\%)$ and total N content $(28\%),$ while
                      the N fixation rate also sharply increased by 75 to $134\%,$
                      and the amount of N transferred with no root barrier was
                      1.24–1.42 times greater than that with a mesh barrier.
                      Redundancy analysis (RDA) showed that the crown root dry
                      weight (CRDW) of maize and lateral root number (LRN) of
                      alfalfa showed the strongest associations with N fixation
                      and transfer. Our results highlight the importance of root
                      contact for the enhancement of N fixation and transfer via
                      changes in root morphology in maize/alfalfa intercropping
                      systems, and the overyielding system was achieved via
                      increases in maize growth, at the cost of smaller decreases
                      in alfalfa biomass production.},
      cin          = {IBG-2},
      ddc          = {640},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {252 - Sustainable Plant Production in a Changing
                      Environment (POF3-252) / 582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-252 / G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000668520200019},
      doi          = {10.1016/S2095-3119(20)63330-5},
      url          = {https://juser.fz-juelich.de/record/888982},
}