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Titolo:
ESTIMATING NITRATE LEACHING AND DENITRIFICATION BY SIMULTANEOUS USE OF BR AND N-15 TRACERS
Autore:
ABUBAKAR R; GOULDING KWT; WEBSTER CP; POULTON PR; POWLSON DS;
Indirizzi:
ROTHAMSTED EXPTL STN,DEPT SOIL SCI HARPENDEN AL5 2JQ HERTS ENGLAND
Titolo Testata:
Journal of the Science of Food and Agriculture
fascicolo: 4, volume: 66, anno: 1994,
pagine: 509 - 519
SICI:
0022-5142(1994)66:4<509:ENLADB>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACETYLENE-INHIBITION; CLAY SOIL; FERTILIZER; NITROGEN; LOSSES; LYSIMETER; BROMIDE; AUTUMN; CROPS; LAND;
Keywords:
NITRATE LEACHING; BR TRACER; DENITRIFICATION; N-15 BALANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
R. Abubakar et al., "ESTIMATING NITRATE LEACHING AND DENITRIFICATION BY SIMULTANEOUS USE OF BR AND N-15 TRACERS", Journal of the Science of Food and Agriculture, 66(4), 1994, pp. 509-519

Abstract

Losses of nitrogen (N) by leaching were estimated in three experiments using bromide (Br) as a tracer. An estimate of denitrification was also made, by difference, by combining the estimate of leaching with a measure of total loss of applied N using N-15. This was compared with a direct measure of denitrification made using acetylene inhibition. Bromide proved to be a poor tracer for nitrate (NO3) leaching at two ofthe three sites, Brimstone and Hoosfield. Performance was rather better at the Broad Mead site. Problems in using Br were associated with (a) difficulties in measuring small concentrations of Br close to background in soil, and (b) reactions involving N such as immobilisation and mineralisation that rapidly change NO3 pools but do not affect Br. Use of Br in held experiments is unlikely to provide reliable estimatesof NO3 leaching over timescales of several weeks as used here unless much more frequent sampling is done. Simultaneous measurements of total losses of N using a N-15 tracer were combined with estimates of NO3 leaching using Br to calculate denitrification; these estimates were compared with measurements of denitrification using acetylene inhibition. Agreement was poor because of (i) the lack of reliability of the acetylene inhibition technique, and (ii) the very large errors associated with calculating denitrification as the difference between an estimate of NO3 leaching and total N losses.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 12:28:59