Assertion: urea's nitrogen | /r/HasProperty | applied to soil
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Chemical nitrogen is usually applied to soil in solid forms, such as urea, ammonium nitrate, and ammonium sulfate and in solution forms, such as anhydrous ammonia, ureaammonium nitrate solutions, and various ammoniated or ammonia solutions; however, the most prevalent form of solid nitrogen used for agriculture today is urea.