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Titolo:
The effect of (NH4NO3)-N-15-N-15 fertilization at flowering on growth and nitrogen fixation of white and blue lupins
Autore:
Schulze, J; Beschow, H; Merbach, W;
Indirizzi:
Univ Halle Wittenberg, Inst Bodenkunde & Pflanzenernahrung, Landwirtschaftlichen Fak, D-06108 Halle, Germany Univ Halle Wittenberg Halle Germany D-06108 Fak, D-06108 Halle, Germany
Titolo Testata:
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
fascicolo: 1-2, volume: 35, anno: 1999,
pagine: 85 - 95
SICI:
1025-6016(1999)35:1-2<85:TEO(FA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOYBEANS;
Keywords:
fertilization; legumes; generative growth stage; lupins; nitrogen 15; nitrogen fixation; pod-filling; source-sink relations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Merbach, W Univ Halle Wittenberg, Inst Bodenkunde & Pflanzenernahrung, Landwirtschaftlichen Fak, Adam Kuckhoff Str 17B, D-06108 Halle, Germany Univ Halle Wittenberg Adam Kuckhoff Str 17B Halle Germany D-06108
Citazione:
J. Schulze et al., "The effect of (NH4NO3)-N-15-N-15 fertilization at flowering on growth and nitrogen fixation of white and blue lupins", ISOT ENV H, 35(1-2), 1999, pp. 85-95

Abstract

It is well established that legume species differ in intensity and duration of nitrogen fixation during pod-filling. This was studied on new lines ofwhite and blue lupins by comparing a solely nitrogen fixing and a treatment supplied with N-15-labelled fertilizer at flowering in pot experiments. Nitrogen application at flowering markedly increased seed and total dry matter and seed and total N yield in white lupins but remained without effect in blue lupins, simply replacing nitrogen fixation. Nitrogen fixation virtually ceased with the onset of pod-filling in white lupins, causing a massiveN-remobilization from vegetative plant parts. In contrast, the blue lupinsfixed about 70% of total nitrogen fixation after flowering and displayed growth and net-N-assimilation of the vegetative plant parts. In both speciesthe stems and pods especially supported seed N-filling, indicated by a low% N and a high C/N ratio at ripeness. It is concluded that pod-filling proved to be a critical stage for the seed yield in grain legumes. Exploiting differences in nitrogen fixation in this growth stage, e.g., by breeding, needs more precise knowledge about the regulation mechanisms and source-sinkrelations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 13:53:54