I forgot to add, I first tried urine after reading a hydro grow someone did on overgrow using drip and rockwool cubes. There must be a place for beneficial bacteria to live.

I first put a cup of urine on my orange tree and the next day it had new growth. I tried this with the rest of my trees and plants. The trees and plants have exploded with new growth, more flowers and fruit and nuts.
I will always use urine in my grows. It's good stuff and I'm cheap.