Assertion: cadmium's use | /r/HasProperty | quoted as primary reason
Facets:
value: most often
type: DEGREE
Source sentences:
text: The use of cadmium-containing fertilisers and sewage sludge is most often quoted as the primary reason for the increase in the cadmium content of soils over the last 20 to 30 years in Europe (Jensen and Bro-Rasmussen 1992).