Background: I’m a microbiologist, veterinarian, and diagnostic pathologist by education and training; taught parasitology for 25 yrs.
I use urine…mostly by ‘direct application’, but have collected and stored it short-term.
It is not ‘sterile’ when it leaves your body…we all have ‘resident’ bacteria in our urethra, and some of these come along for the ride when we urinate. Recent examinations of the microbiome in organ systems show that there are bacterial populations normally present in places we previously thought were ‘sterile’, like the pregnant uterus…but they’re not.
Biggest issue with human urine, as someone already pointed out is the salt content - mostly sodium.
Edit: Space inserted here to signify my shift from discussing urine to feces, as it initially created some confusion:
Human fecal material… I’m not a fan of its use on/for food crops… sure, my own might be OK, but when you start collecting from the general public… too many potential pathogens for me to consider it safe, even if ‘composted’… viruses like rota, polio are of fecal origin, Salmonella and enteropathogenic E.coli should always be a consideration, and folks coming from less-developed countries with sketchy sewage/water treatment may be carrying intestinal parasites, like Taenia solium (the human/pork tapeworm, which can cause ocular & neurocysticercosis.
Just watch a few episodes of ‘Monsters Inside Me’ - lol.
If you want to advocate for widespread use of ‘Humanure’ in food crop production, be aware that you also need to be cognizant of the potential for increasing infant mortality rates.