I first saw Brad Lancaster use urine as fertilizer. The whole video is fascinating, it’s mainly about waterharvesting.
Then later I saw Geoff Lawton talk about carbon to nitrogen ratios of various manures including human urine so I thought, yeah, it makes total sense.
But undiluted it’s to be used in moderation. I’ve used undiluted urine as a first dose in my garden just after I turned my lawn into permaculture beds, now I dilute.
This past winter I experimented with urine. I had one plant I gave my urine to and it worked great. One cup per gallon of water. It grew some real dank nugs.
At 10:1 water to urine I thought it made my space smell faintly of pee, though I was growing in a spare bathroom so the smell might have been all in my head.
Either way the plants had a healthy rich green colour.
Actually, now that I think about it I was checking ppm(with a cheap uncalibrated pen) and running veg at like 300-400 early on with each watering and gradually increased it to like 800 or so by flip, then started using the comfrey, which I think I was running at 800 or so ppm(according cheapo pen). It was a couple years ago.
I was just getting set up in a new space and I wanted get a baseline of what I could do with very minimal input, turns out quite a lot! I’ve since moved on to full on coots style living soil irrigated with blumats, which is going really well.