hehe saltwater sucks water out of the plant, something about the permiability of the cell walls and an effort to reach an equilibrium with the salt, i don't really remember,
Truth be told, I've never done it, but get some good homegrown from friends who do it, and have been for years. The diluted amounts give small trace elements, most noteably Nitrogen.
I say just water your babies with the proper nutes when needed, but if your gunna go the pee-pee way....
Pizz on your plants if you want to. They're your plants. I make sun tea out of Chicken shit and feed it to my food crops. But when I think about pizzing on my pot plants I remember when I was a kid and pizzed on the campfire.
I wouldn't trust human urine these days. The nasty chemicals from food preservatives and medications.. its not as natural as you think it is. An animal on the other hand..