Assertion: copper sulfate | /r/ObjectUse | used in organic farming
Facets:
value: as an allowed synthetic substance
type: MANNER
value: in conventional growing
type: LOCATION
Source sentences:
text: Since, copper sulfate has been used in organic farming as an allowed synthetic substance (most modern copper comes from reusing non-iron scrap metal in a factory and then precipitating the compound from sulfuric acid), as well as in conventional growing.