Titre :
|
Effects of cover crops on the nitrogen fluxes in a silage maize production system
|
Auteurs :
|
J. Schroder ;
W. Van Dijk ;
W. De Groot
|
Type de document :
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article/chapitre/communication
|
Année de publication :
|
1996
|
Format :
|
p. 293-315
|
Langues:
|
= Anglais
|
Catégories :
|
AGRICULTURE, AGRONOMIE ET ELEVAGE
|
Mots-clés:
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AZOTE
;
NITRATE
;
LESSIVAGE DU SOL
;
MAIS
;
FERTIGATION
|
Résumé :
|
Rye and grass cover crops can potentially intercept residual soil mineral nitrogen (SMN), reduce overwinter leaching, transfer SMN to next growing seasons and reduce the fertilizer need of subsequent crops. These aspects were studied for 6 years in continous silage maize production systems with nitrogen (N) input levels ranging from 20 to 304 kg total N ha(-1), on a sandy soil in The Netherlands. Rye and grass cover crops were able to absorb on average 40 kg N ha(-1) in the aboveground plant parts. The actual N uptake was largely determined by winter temperatures and hardly by residual SMN. At low N input levels cover crops reduced N leaching in accordance with their N uptake. At high N input levels, however, the reduction of leaching losses exceeded the storage capacity of the cover crop, suggesting that cover cropping can have stimulated the loss of N via denitrification or immobilisation.
|
Source :
|
Netherlands Journal of Agricultural Science, vol.44
|