Increased denitrification below the root zone in the fall following a spring manure application. Can. J. Soil Sci. 77: 249-251. Indirect measurements of denitrification to 120 cm depth in a coarse textured soil in October showed higher denitrification rates following a single spring application of dairy cattle slurry than following a spring application of fertilizer. The highest denitrification rates occurred immediately above and below the water table (90 cm depth) and resulted primarily from C applied in the manure moving down through the soil profile.Key words: Dairy cattle slurry, carbon, nitrate, shallow water table Paul, J. W., Etches, V. et Zebarth, B. J. 1997. Accroissement de la dénitrification en dessous de la rhizosphère dans l'automne suivant un épandage de lisier au printemps. Can. J. Soil Sci. 77: 249-251. Des mesures indirectes de la dénitrification prises en octobre jusqu'à 120 cm de profondeur dans un sol de texture grossière ont mis en évidence des taux de dénitrification plus élevés consécutifs à un épandage printanier de lisier de bovins laitier qu'à un apport d'engrais chimique. Les taux les plus élevés se produisaient immédiatement au-dessus et en dessous du niveau de la nappe (90 cm de profondeur) ce qui tenait principalement à la migration du C du fumier vers le bas du profil.
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