Titre :
|
Impact of excreted nitrogen by grazing cattle on nitrate leaching
|
Auteurs :
|
M. Hack-ten-broeke ;
W. De Groot ;
J. Dijkstra
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1996
|
Format :
|
p. 190-198
|
Langues:
|
= Anglais
|
Catégories :
|
POLLUTION NUISANCE
|
Mots-clés:
|
AZOTE
;
DEJECTIONS ANIMALES
;
PATURAGE
;
LESSIVAGE DU SOL
;
MODELE
;
NITRATE
;
SOL SABLEUX
|
Résumé :
|
At De Marke experimental farm, data on water and nitrogen flows in the unsaturated zone were gathered on two grazed pastures on sandy soils during the years 1991 to 1994. These provided a basis for calibration and validation of simulation models. The different levels of nitrate-N concentrations of the two plots could largely be explained by differences in crop uptake and simulated denitrification as influenced by different groundwater levels. The irregular distribution of excreta was taken into account by a simulation study quantifying the variability of nitrate-N concentrations under a grazed field. The resulting distribution of simulated nitrate-N concentrations explained the average and peak values of the measured concentrations.
|
Source :
|
Soil Use and Management, vol.12
|