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Titolo:
Nitrogen leaching from winter cereals grown as part of a 5-year ley-arablerotation
Autore:
Webster, CP; Poulton, PR; Goulding, KWT;
Indirizzi:
AFRC,ndnst Arable Crops Res, Dept Soil Sci, Harpenden AL5 2JQ, Herts, Engla AFRC Harpenden Herts England AL5 2JQ Sci, Harpenden AL5 2JQ, Herts, Engla
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 2, volume: 10, anno: 1999,
pagine: 99 - 109
SICI:
1161-0301(199903)10:2<99:NLFWCG>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROFILES;
Keywords:
ceramic cup; immobilization; ley; long-term experiment; mineralization; nitrate leaching; rotation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Webster, CP AFRC,ndnst Arable Crops Res, Dept Soil Sci, Harpenden AL5 2JQ,Herts, Engla AFRC Harpenden Herts England AL5 2JQ en AL5 2JQ, Herts, Engla
Citazione:
C.P. Webster et al., "Nitrogen leaching from winter cereals grown as part of a 5-year ley-arablerotation", EUR J AGRON, 10(2), 1999, pp. 99-109

Abstract

Ceramic suction cups were used to measure nitrogen (N) leaching over threeconsecutive winter periods from a long established ley-arable rotation experiment. We examined four treatments: 3-year all-arable, grass-clover ley and grass ley each followed by two seasons of arable test crops and an 8-year grass ley that remained as grass throughout our study. Four rates of fertilizer N were applied to sub-plots of the test crops. Our primary objectivewas to compare the effect that the rotations had on N leaching from the arable test crops. Cultivation of the 3-year grass and grass:clover leys and the sowing of winter wheat did not create a major flush of net N mineralization because of the unusually dry autumn weather. In the first winter following sward destruction, although the concentration of N in drainage following the grass/clover was low, it was significantly greater than that following the grass, which was greater than that from the continuous grass treatment. In contrast, the concentration and quantity of N in drainage from the all-arable treatment was at least five times greater than any other treatment. This was due to earlier and more rapid N release from the residue of thepreceding arable crop. In the winters after harvest of the cereal test crops (i.e. the second and third season of measurements), the peak drainage N concentrations were similar in all treatments (20 mu g NO3-N ml(-1)). The amount of N leached was not related to fertilizer addition. Over the full 5-year rotation, we found that the rotations that included a ley were better at conserving N; the estimated annual N leaching losses from the all-arable, grass, grass/clover and continuous grass were 29, 17, 17 and 2 kg N ha(-1) year(-1), respectively. On all treatments, bur especially the grass-clover ley, the greatest rate of fertilizer addition caused a yield reduction. The N-balance indicates a considerable net immobilization during this study under the sub-plots of the arable test-crops that received N fertilizer. This corresponds to similar results of N-balance studies on other long-term experiments. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 19:13:26