Urine is sterile and loaded with nitrogen. 10:1 dilution, or 1 cup/gallon fresh is a good way to use it. Just don't let it sit around. You can also buy crystalized urea (46-0-0) off amazon for about $12/5lb. I use it in a dry mix recommended by Praxxus, but I have used my own before. I just wouldn't mention it while giving away produce to people. "Hey! Here's some tomatoes for you.....btw, I peed on them."
