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Titolo:
IMPROVEMENT OF THE N-15 DILUTION METHOD FOR ESTIMATION OF ABSORPTION OF NOX BY PLANTS SUPPLIED WITH N-15-LABELED FERTILIZER
Autore:
QIAO Z; MURRAY F;
Indirizzi:
MURDOCH UNIV,SCH BIOL & ENVIRONM SCI MURDOCH WA 6150 AUSTRALIA
Titolo Testata:
New phytologist
fascicolo: 1, volume: 138, anno: 1998,
pagine: 13 - 18
SICI:
0028-646X(1998)138:1<13:IOTNDM>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN-DIOXIDE; ATMOSPHERIC NO2; BARLEY PLANTS; GAS-EXCHANGE; NITRATE;
Keywords:
ESTIMATION OF NOX ABSORPTION; N-15-LABELED FERTILIZER; N-15 DILUTION METHOD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
Z. Qiao e F. Murray, "IMPROVEMENT OF THE N-15 DILUTION METHOD FOR ESTIMATION OF ABSORPTION OF NOX BY PLANTS SUPPLIED WITH N-15-LABELED FERTILIZER", New phytologist, 138(1), 1998, pp. 13-18

Abstract

To develop further the methods for estimation of NOx absorption by plants supplied with N-15-labelled fertilizer, we proposed a new calculation method, total N fixed method (TNF), and compared with the N-15 dilution method and the classical mass balance method (MB). Hydroponically grown soybean plants were supplied with N-15-labelled nitrate and exposed to 200-250 nl l(-1) NO2 for 7 d. The proportions of the N derived from NO2 to total N in exposed plants were estimated by the three methods. The reported rates of NO2 absorption by several plant species,estimated by the N-15 dilution method, were recalculated using the TNF method. The results of the two methods were compared and showed that: (1) The N-15 dilution method overestimated the content of NO2-N in exposed plants compared with the MB method whilst the TNF method produced estimations of NO2-N closer to those by the MB method when the plants were supplied with 5 mM nitrate. (2) The differences in estimationsbetween the MB method and either the N-15 dilution method or the TNF method increased with decreasing supply of N-15-labelled nitrate to roots.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:23:05