According to a study from a group of environmental scientists at the University of Kuopio in Finland, human urine and wood ash make a reasonably potent tomato fertilizer, boosting plant growth and fruit yield dramatically over untreated plants and nearly keeping pace with conventional fertilizer.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/human-urine-tomato-fertilizer
[2] http://admin.indiaenvironmentportal.org.in/category/author/john-matson
[3] http://admin.indiaenvironmentportal.org.in/category/journal/asian-agri-history
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-fertilisers
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vegetables