piss in a 5 gallon bucket, and add four gallons of water. then water them. Done.
if you have any left over, give it to your landscaping plants and watch them green-up.
that doesn't look that bad, i think i've said it three times, maybe four, outside the sun is strong... so you will run out of nitrogen if the plant doesn't have ample soil to obtain the nutrients from. If anything the plant is rootbound, and like I said before, you are going to have more problems with rain and humidity than you will with anything else, you have a LONG-ass ways to go man.
Me personally?
wouldn't do anything at all.
the yellowing leaves are SHADED... it's normal.
yea, sure it could use nitrogen, but being rootbound is the issue
and feeding I don't think will help the plant from doing what is normal, and that's dropping shaded leaves.