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Titre :
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A comparison of animal output and nitrogen leaching losses recorded from drained fertilized grass and grass/clover pasture
|
|
Auteurs :
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K. Tyson ;
D. Scholefield ;
S. Jarvis ;
A. Stone
|
|
Type de document :
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article/chapitre/communication
|
|
Année de publication :
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1997
|
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Format :
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p. 315-323
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Langues :
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= Anglais
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Catégories :
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QUALITE DE L'EAU
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Mots-clés :
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PRAIRIE
;
PATURAGE
;
FERTILISATION
;
LESSIVAGE DU SOL
;
AZOTE
|
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Résumé :
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Annual liveweight gain of beef cattle (steers) grazing grass pasture fertilized with 200 kg N/ha was compared over a period of 7 years (1989-95) with that of steers grazing grass/white clover pasture given no artificial N fertilizer at North Wyke, Devon, UK. Nitrogen lost by leaching over the ensuing winter drainage periods was monitored from both pastures. Nitrogen leaching loss from the fertilized pasture over an extended period of 13 years (1983-95) is also reported.The average annual liveweight gain of the steers grazing the grass/clover pasture (0.81 t/ha) was 19% lower than that of the steers grazing the N-fertilized grass pasture (1.00 t/ha). The average annual loss of nitrate-N by leaching in winter drainage from the grass/clover pasture (13 kg/ha) was only 26% of that recorded from the fertilized grass (50 kg/ha).
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Source :
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Journal of Agricultural Science, vol.129
|
