Assertion: fertilizer's nitrogen | /r/AtLocation | combination
Facets:
value: in seawater as ammonium
type: LOCATION
Source sentences:
text: In combination, nitrogen is found in the rain and soil as ammonia and ammonium salts and in seawater as ammonium (NH 4 +), nitrite (NO 2 −), and nitrate (NO 3 −) ions.