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Titolo:
Nitrogen fluxes in three arable soils in the UK
Autore:
Webb, J; Harrison, R; Ellis, S;
Indirizzi:
ADAS Consulting Ltd, Wolverhampton WV6 8TQ, W Midlands, England ADAS Consulting Ltd Wolverhampton W Midlands England WV6 8TQ nds, England ADAS Consulting Ltd, ADAS Boxworth, Cambridge CB3 8NN, England ADAS Consulting Ltd Cambridge England CB3 8NN Cambridge CB3 8NN, England
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 2-3, volume: 13, anno: 2000,
pagine: 207 - 223
SICI:
1161-0301(200008)13:2-3<207:NFITAS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERTILIZER NITROGEN; MINERAL NITROGEN; WINTER-WHEAT; N-15-LABELED FERTILIZER; AMMONIA EXCHANGE; SANDY SOILS; OXIDE; CROP; LOSSES; FATE;
Keywords:
nitrogen cycle; nitrogen balance; emissions; pollution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Webb, J ADAS Consulting Ltd, Wergs Rd, Wolverhampton WV6 8TQ, W Midlands, England ADAS Consulting Ltd Wergs Rd Wolverhampton W Midlands England WV6 8TQ
Citazione:
J. Webb et al., "Nitrogen fluxes in three arable soils in the UK", EUR J AGRON, 13(2-3), 2000, pp. 207-223

Abstract

Measurements were made of nitrate leaching, ammonia (NH3), nitrous oxide (N2O) and dinitrogen (N-2) emissions, and crop offtake of N, together with wet N deposition in order to estimate annual fluxes of N inputs and N outputs at three sites, Gleadthorpe (GL), Terrington (TE) and Rosemaund (RO), in the UK over the three seasons 1995/96, 1996/97 and 1997/98. The soils were loamy sand, alluvial silt and silty clay loam, respectively. The objective of the project is to quantify all the major N fluxes over two arable rotations on contrasting soil types. Soil N at GL at 0.07-0.08% was about half that measured at TE and RO (0.11-0.17%). These differences were consistent with those usually found between soils of different clay content in an arablerotation. Over the first two winters excess winter rainfall (EWR) at all sites, especially TE, was less than average. In consequence amounts of nitrate-N leached were better related to EWR, than to the previous crop. Estimates of mineralization overwinter 1995/96 at 50-60 kg/ha, did not differ consistently between sites or previous crops. Over the following winter data suggest net immobilization of soil mineral N (SMN). Using only measured fluxes, annual N2O losses of 0.5-2.7% of fertilizer-N applied were estimated. Wet deposition of 20 kg N/ha at RO was greater than wet deposition at GL and TE of 7 kg N/ha. These differences were greater than expected from current national estimates of deposition. Wet deposition of N has contributed 5% oftotal N inputs and NH3 fluxes have usually been negligible. Outputs of N were dominated by crop offtake and nitrate leaching. Balances for winter wheat ranged from -85 to +57 kg/ha, largely in consequence of variation in N offtake, due to differences in yield and fate of straw, and also in nitrate leaching. Gaseous losses were usually small, and in total appear to be no greater than N inputs from wet deposition. Thus in arable systems where no organic manures are applied, priority in reducing losses of N to the environment needs to be given to nitrate leaching. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 25/09/20 alle ore 16:09:44