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000888982 1001_ $$0P:(DE-HGF)0$$aSHAO, Ze-qiang$$b0$$eCorresponding author
000888982 245__ $$aNitrogen acquisition, fixation and transfer in alfalfa-maize intercrops are increased through root contact and morphology responses tointerspecies competition
000888982 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2020
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000888982 520__ $$aNitrogen (N) fixation by legumes and nitrogen transfer to cereals have been considered as important pathways for overyielding and higher N use efficiency in cereal/legume intercropping systems. However, the extent to which root morphology contributes to N fixation and transfer is unclear. A two-factorial greenhouse experiment was conducted to quantify the N fixation, transfer and root morphology characteristics of the maize/alfalfa intercropping system in two consecutive years using the 15N-urea leaf labeling method, and combining two N levels with three root separation techniques. N application could inhibit N fixation and transfer in a maize/alfalfa intercropping system. Irrespective of the N application level, compared with plastic sheet separation (PSS), no separation (NS) and nylon mesh separation (NNS) significantly increased the total biomass (36%) and total N content (28%), while the N fixation rate also sharply increased by 75 to 134%, and the amount of N transferred with no root barrier was 1.24–1.42 times greater than that with a mesh barrier. Redundancy analysis (RDA) showed that the crown root dry weight (CRDW) of maize and lateral root number (LRN) of alfalfa showed the strongest associations with N fixation and transfer. Our results highlight the importance of root contact for the enhancement of N fixation and transfer via changes in root morphology in maize/alfalfa intercropping systems, and the overyielding system was achieved via increases in maize growth, at the cost of smaller decreases in alfalfa biomass production.
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000888982 7001_ $$0P:(DE-Juel1)180352$$aZheng, Congcong$$b1$$eCollaboration author
000888982 7001_ $$0P:(DE-Juel1)144879$$aPostma, Johannes Auke$$b2$$eContributor
000888982 773__ $$0PERI:(DE-600)2668746-X$$a10.1016/S2095-3119(20)63330-5$$n8$$p2240-2254$$tJournal of integrative agriculture$$v20$$x2095-3119$$y2020
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