Titre :
|
The influence of organic nitrogen mineralization on the management of agricultural systems in the UK
|
Auteurs :
|
M. Shepherd ;
E. Stockdale ;
S. Jarvis
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1996
|
Format :
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p.76-85
|
Langues:
|
= Anglais
|
Catégories :
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AGRONOMIE
|
Mots-clés:
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AZOTE
;
MATIERE ORGANIQUE
;
PRATIQUE CULTURALE
;
FERTILISATION
|
Résumé :
|
The understanding of nitrogen mineralization is central to providing good advice to ensure that nitrogen (N), from whatever source, is utilized by crops as efficiently as possible to minimize pollution. We have reviewed how mineralization is accounted for in current advice. It is clear that there is at least a qualitative understanding of the effects of soil and crop management on N mineralization and N supply, which has enabled the development of Codes of Good Agricultural Practice and fertilizer recommendations systems, based on sound scientific principles. However, to refine advice there is a need for a better quantitative understanding. Although soil organic matter (SOM) is a major source of N for crops, we are unable adequately to predict fertilizer requirement as affected by mineralization of SOM. Nitrogen returns From crop residues can vary considerably between fields; the provision of better field specific advice is restricted by our inability accurately to quantify this variability.
|
Source :
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Soil use and management, vol.12
|