Urea has been a known fertilizer for decades.
https://www.fertilizer-machine.com/solution/urea-fertilizer.html
Urea is also used in skin cream, cosmetics, and DEF.
The Romans discovered an effective stain-remover: human urine with its high ammonia content. Urine-based cleaning agents, euphemistically known as ‘chamber lye’, were used well into the 19th century.