The fate of much of the nitrogen applied to crops or grass as fertiliser around the world is ultimately to pass out of digestive systems as urine. We are getting better at recognising and utilising the nitrogen from livestock slurry and manures, but what about the urine that comes out of humans and goes down the toilet?

A few initiatives are looking at redesigning toilet systems to capture the nitrogen at source.  

See some write-ups below...

https://www.tastingtable.com/872371/the-solution-to-the-fertilizer-shortage-may-be-more-accessible-than-youd-think/

https://www.france24.com/en/live-news/20220504-can-pee-help-feed-the-world

https://www.euronews.com/green/2022/05/01/human-urine-could-be-an-effective-and-less-polluting-crop-fertiliser

http://richearthinstitute.org/wp-content/uploads/2019/12/Home-Use_Manual_05.pdf

Is there scope for more industrialised versions of this?