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Titolo:
Transfer of symbiotically fixed nitrogen in an alfalfa-grass mixture studied through isotope dilution in a pot experiment
Autore:
Beschow, H; Schulze, J; Merbach, W;
Indirizzi:
Univ Halle Wittenberg, Landwirtschaftl Fak, Inst Bodenkunde & Pflanzenernahrung, D-06108 Halle, Saale, Germany Univ Halle Wittenberg Halle Saale Germany D-06108 8 Halle, Saale, Germany
Titolo Testata:
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
fascicolo: 1, volume: 36, anno: 2000,
pagine: 21 - 33
SICI:
1025-6016(2000)36:1<21:TOSFNI>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIXATION; RHIZOSPHERE;
Keywords:
alfalfa-grass mixture; isotope dilution; nitrogen(15); N-2 fixation; N transfer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Merbach, W Univ Halle Wittenberg, Landwirtschaftl Fak, Inst Bodenkunde & Pflanzenernahrung, Adam Kuckhoff Str 17B, D-06108 Halle, Saale, Germany UnivHalle Wittenberg Adam Kuckhoff Str 17B Halle Saale Germany D-06108
Citazione:
H. Beschow et al., "Transfer of symbiotically fixed nitrogen in an alfalfa-grass mixture studied through isotope dilution in a pot experiment", ISOT ENV H, 36(1), 2000, pp. 21-33

Abstract

The nitrogen transfer between alfalfa and ryegrass was studied through isotope dilution at three different levels of N fertilization (20 mg N/pot, 200 mg N/pot, 400 mg N/pot) in a pot experiment using quartz sand as a substrate. An isogenic, nodulating, but non nitrogen fixing alfalfa line was usedas a reference crop. Fixed N was transferred to the grass in the 20 mg N treatment and contributed markedly to the N nutrition of the grass (about 50% of the N in the plants). No transfer of fixed N could be detected in the higher fertilized treatments, although nitrogen fixation was only slightly inhibited by the presence of the fertilized mineral N. It is concluded thatN transfer is strongly influenced by the N concentration in the substrate and transferred N contributes only slightly to the productivity of the legume/grass mixture under the given experimental conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:32:26