Assertion: cattle manure | /r/PartOf | main source of nitrogen
Facets:
value: agreste, 2014a
type: TEMPORAL
value: in certain regions
type: LOCATION
Source sentences:
text: In certain regions (Brittany, Pays de la Loire, Limousin), livestock manure make up the main source of nitrogen and are spread essentially on maize ground, of which the area included in crop rotation is greater than elsewhere (Agreste, 2014a).