Assertion: nitrogen fertilizer | /r/HasProperty | obtained
Facets:
value: from synthetic ammonia
type: OTHER
Source sentences:
text: Most nitrogen fertilizers are obtained from synthetic ammonia; this chemical compound (NH 3 ) is used either as a gas or in a water solution, or it is converted into salts such as ammonium sulfate, ammonium nitrate, and ammonium phosphate, but packinghouse wastes, treated garbage, sewage, and manure are also common sources of it.