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Titolo:
The fate of autumn-, late winter- and spring-applied nitrogen fertilizer in a perennial ryegrass (Lolium perenne L.) seed crop on a silt loam soil inCanterbury, New Zealand
Autore:
Cookson, WR; Rowarth, JS; Cameron, KC;
Indirizzi:
Lincoln Univ, Soil Plant & Ecol Sci Div, Canterbury, New Zealand Lincoln Univ Canterbury New Zealand ol Sci Div, Canterbury, New Zealand
Titolo Testata:
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
fascicolo: 1, volume: 84, anno: 2001,
pagine: 67 - 77
SICI:
0167-8809(200103)84:1<67:TFOALW>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-15-LABELED FERTILIZER; AMMONIA VOLATILIZATION; SOWN CROPS; LOSSES; WATER; DENITRIFICATION; SEASON;
Keywords:
New Zealand; silt loam soil; nitrogen fertilizer; N-15; yield; nitrogen losses; risk; benefit;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Cookson, WR Lincoln Univ, Soil Plant & Ecol Sci Div, Hilgendorf Bldg,POB 84, Canterbury, New Zealand Lincoln Univ Hilgendorf Bldg,POB 84 Canterbury New Zealand d
Citazione:
W.R. Cookson et al., "The fate of autumn-, late winter- and spring-applied nitrogen fertilizer in a perennial ryegrass (Lolium perenne L.) seed crop on a silt loam soil inCanterbury, New Zealand", AGR ECO ENV, 84(1), 2001, pp. 67-77

Abstract

The use of fertilizer nitrogen (N) during seasons other than spring to increase seed yield of perennial ryegrass (Lolium perenne L.) has raised concerns about possible environmental contamination from fertilizer N. The fate of N-15-labelled fertilizer applied at several rates during autumn, late winder and/or spring was measured using silt loam (Eutric Cambisol (FAO)) monolith lysimeters (500mm diameter, 600 mm deep) during two, I-year lysimeterstudies in Canterbury, New Zealand. Total ryegrass uptake of late winter and spring applied N-15-labelled fertilizer at harvest was greater (40 and 43%, respectively) than N fertilizer applied in autumn (18%) in 1996 and 1997, reflecting plant demand and soil immobilization in the different seasons. Consequently, in conjunction with spring N fertilizer, late winter N fertilizer application had significantly (P<0.05) greater affects on seed yields than autumn applied N fertilizer. Losses of late winter applied N fertilizer (9%) were significantly lower than from N fertilizer applied during autumn (23%) or spring (19%) because of conditions which encouraged leaching and denitrification during autumn and ammonia volatilization during spring. Risk:benefit analysis showed that, under the climatic and soil conditions prevailing during these experiments, autumn N fertilizer application was associated with high risk of losses and small benefits in crop N recovery. Late winter and spring N fertilizer had substantial bene fits with much lowerrisk. (C) 2001 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 19/09/20 alle ore 10:58:08