Should public urination be rewarded? It’s possible. Researchers at the University of Kuopio in Finland have combined human urine with wood ash to form an effective mineral fertilizer. They used this fertilizer to nourish an array of produce including beets, cucumbers, cabbage and tomatoes, all of which grew to become healthy vegetables. The experiment could pave the way for  improvements in sanitation and agriculture in developing nations.

http://www.scientificamerican.com/article.cfm?id=human-urine-is-an-effective-fertilizer