Assertion: black alder | /r/HasProperty | recommended as a nurse crop
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: For this reason, black alder is sometimes recommended as a nurse crop (a species interplanted with the species of interest in order to assist in its growth) for numerous hardwood tree species (Bohanek and Groninger 2005, Plass 1977, Shepperd and Jones 1985, Vogel 1981).