Hell of a Bad Situation

Hello,
here is John from Italy. I have just returned home from a month travel for studying overseas. For the time I was away my brother should have taken care of my grow, but apparently he didn't. I came back and I found 3 of the 4 Barney's Tangerine Dream I planted. The grow box is 1x1x1.9 m^3 with an Agro 400W light system and Nutriculture Quadgrow hydro (coco-clay pebbles mix) system. The nutrients I'm using are Advanced Hydroponics of Holland: Dutch Formula. (Grow: (N)25-(P)12-(K)50, Bloom: (N)00-(P)50-(K)35, Micro: (NO):45-(P)00-(K)10)
When I left I had 4 healthy starters, now I have only 3 of which 1 didn't grow much and the other two are suffering from what I suppose is a Nitrogen deficiency.
Plus the fact that they have an immense amount of roots.
He said one was dead and the others were doing well until his pH meter broke and he didn't adjust pH for almost 2 weeks. (God, he's an idiot)
He switched 11-13 ten days ago after one month of vegetative.
Can you give me any advice on what to do to solve the problems?
Thanks very much,
I appreciate any help.
Pics

they just look severely under fed/watered. Strip the yellow, that aint comin back, ya should be good.

Hey buddy, sorry for your troubles
A month is a long time to leave your garden is someone else's hands so it is kind of to be expected.
It's most certainly an N deficiency seeing as the yellowing is starting from the bottom up.
With a good feed and some love they will bounce back healthy and strong over the next couple of weeks.
Most of the yellowed leaves should fall off with a slight tug, you should remove them.

Hope it works out for you, best of luck.

Definitely needs fed some N. Good luck!

Dont start over!! Plenty of time left and they should make it so long as you treat them well from hear on out and don't leave them in the care of anyone else.

Normal feeding regimen and they will pull back/ As stated above the leaves that have been sucked dry will pretty much fall off at the slightest pull. get rid of those only and put some love back into her.

what the last couple guys said. Personally, i've seen much worse here on riu by guys who were there LOL. They'll bounce back. I find that misting with a grozyme and neem oil helps too. Plants love neem oil. No idea why.

oh you may want to get all the dead foliage from your pots, I can't say for sure because I do not know first hand but have read it can cause bacteria and such.

can't hurt to remove it.

urban1026835 said:

oh you may want to get all the dead foliage from your pots, I can't say for sure because I do not know first hand but have read it can cause bacteria and such.

can't hurt to remove it.

Click to expand...

Yep and the decaying leaves invites pests and bugs and mold and general bad stuff, a clean tidy garden is a happy productive garden

Thank you very much guys.
I would never have left my beauties if I could have decided. But, hey, I thought I could trust my own brother.
Anyways this is actually my first grow in Hydro, is there anything I have to do about the giant mass of roots?
And being TD an almost complete Sativa strain, how much time do you think it will need from now to harvest? I heard about very long flowering times...
I'll update you with the progress.

Having a large mass of roots is good!