caa a22 4500 606217983 CHVBK 20210128101110.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11104-014-2354-8 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2354-8 The amounts and dynamics of nitrogen transfer to grasses differ in alfalfa and white clover-based grass-legume mixtures as a result of rooting strategies and rhizodeposit quality [Elektronische Daten] [Gaëtan Louarn, Edina Pereira-Lopès, Joëlle Fustec, Bruno Mary, Anne-Sophie Voisin, Paulo de Faccio Carvalho, François Gastal] Aims: Differences in the ability to fix and transfer N have been shown between perennial legume species. However, the traits responsible for such variations are largely to be identified. This study aimed at comparing the dynamics of N transfer from alfalfa and white clover and test whether their differences resulted from difference in fixation, legume proportion, population dynamics or tissue composition. Methods: A three-year field experiment and a greenhouse experiment were carried out. Nitrogen fixation and transfer were assessed trough 15 N dilution and difference methods. Results: Both experiments confirmed significant differences between legumes regarding N transfer capacity. Although alfalfa cumulated twice as much biomass and fixed nitrogen, it transferred smaller amounts of N (59 versus 147kgN.ha−1 over three years in the field) under a delayed dynamic. The amounts of nitrogen transferred were related to recent decreases in legume population density. Moreover, root tissue composition differed; white clover had a higher proportion of fine roots with a lower C/N and lignin content. This resulted in more rapid N release from the severed roots of clover. Conclusions: The traits controlling plant persistency, root material turnover and residue quality may better explain N transfer dynamics than overall legume production and fixation. Springer International Publishing Switzerland, 2014 Grass-legume mixture nationallicence Forage legumes nationallicence Nitrogen transfer nationallicence Nitrogen fixation nationallicence Residue quality nationallicence Population dynamics nationallicence Louarn Gaëtan INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut Pereira-Lopès Edina INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut Fustec Joëlle Groupe Ecole Supérieure d'Agriculture, UR LEVA, F49007, Angers, France aut Mary Bruno INRA, UPR AgroImpact, Site de Laon, Pôle du Griffon, F02000, Barenton-Bugny, France aut Voisin Anne-Sophie INRA, UMR 1347 Agroécologie, BP 86510, F21000, Dijon, France aut de Faccio Carvalho Paulo Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil aut Gastal François INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 289-305 0032-079X 389:1-2<289 2015 389 11104 https://doi.org/10.1007/s11104-014-2354-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2354-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Louarn Gaëtan INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut NATIONALLICENCE 700 1- Pereira-Lopès Edina INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut NATIONALLICENCE 700 1- Fustec Joëlle Groupe Ecole Supérieure d'Agriculture, UR LEVA, F49007, Angers, France aut NATIONALLICENCE 700 1- Mary Bruno INRA, UPR AgroImpact, Site de Laon, Pôle du Griffon, F02000, Barenton-Bugny, France aut NATIONALLICENCE 700 1- Voisin Anne-Sophie INRA, UMR 1347 Agroécologie, BP 86510, F21000, Dijon, France aut NATIONALLICENCE 700 1- de Faccio Carvalho Paulo Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil aut NATIONALLICENCE 700 1- Gastal François INRA, UR4 URP3F, BP6, F86600, Lusignan, France aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 289-305 0032-079X 389:1-2<289 2015 389 11104