Hi

I have in the last few days put the girls in the gt901 tanks sitting in 4" rockwall cubes.

Things are now getting really bad as you can see from the pic,i believe that i have overferted the plants even though i was feedind at 0.8-1.0.

I have changed the water to a very mild nute soloutin about 0.4.

What to i have to do to clear the nute lockout and get them to start growing again?

Thanks

H

Heya Hadley , look hungry to me mate , if there in 4" blocks then they certainly should be higher ec of 0.4 . How old are they ?
It would help no end to people if you could fill in youre profile mate , you will get more help for sure , good luck .
Psst , is that white widow ? by any chance ?

edit for psst

yep they are hungry give them ec 1.0 and check 24hrs later for changes in the res

Thanks for the help but;

There are 3 different sativa strains in there guys,cheesewreck,chocolope and applejack.

I use a 50/50 mix of ro water and hard tap water.

I know for a fact that they have been overferted as there is burnt leaf tip edges and also there were ramshorn leaves.

What i need to know is how do i get them back on track?

Whats ro water? are you factoring into your feeding the original ec of your water solution combined.

I can't see evidence in your pics of overfeeding at all.

They look hungry to me and id go with the advice above and see if they perk up.

Whats the temps like in the room too?

Hello m8,

I had very similar probs with nft, The plants either took off and grew lovely or done as yours have.

I have a feeling it may be the rockwool cubes getting too wet and waterlogging the plant ?, Maybe try sitting the cubes on something like tile spacers (I've heard of people doing this ) and just let the roots get the water which will feed the plant but should just keep the cube damp.

See how wet your cubes are to see if this could be the problem.

Heya , ok then whats the base you're base ec ? im hard water "9.1" & with a 50/50 mix my ec would be above 0.4 from the off , i would also take the advice of herman too , personally i start my pump 15 on 45 off for the first week.
, flush with ph'ed water for 24hrs , if you want you're plants to green up , wait for more advice , as to me as i said they look hungry , good luck .

Hi

The base water of mixed ro/tap water is 0.2.

I was mixing up the nute solution to 1.0 which was way to high so it was me that made the mistake.

I may well flush with plain water for 24 hrs and see what happens.

I third this too I can vaguely remember plants looking similar or refusing to grow from waterlogging, in my case I had been lucky with my previous room and it had been level or at least slanting in the right direction but my new room slopes the wrong way and I hadn't notice that the water was pooling on the tray rather than running across it like the film im used to. It's propped up now a little at the pump end and I have the pump turned down quite low at first and up it as the plants seem to be drinking more as it passes across the tray.

It looks like they've been uderfed earlier in their lives mate, they're lookin nice and green now tho.

I think hermans probably right about whats causing yer droop,could be your pump timings tho
is it on all the time?

This comment is bollocks btw..

All that'll do is starve em mate, drop yer ec to 0.6-0.8 and see how they look in a day or 2..
Having a float thro some NFT diarys would be a good idea an all hadley, if ya haven't already.

Heya , its only bollocks if you cut it in half like a politician and i only talk in riddles cause im welsh

Some of those plants look small to be on yer trays dude, are there plenty
of roots showin thro the blocks?

Sorry mate what i meant was, this comment is bollocks..

I am now faced with 2 choices;
1 flush with plain water for 24 hrs.
2 use clearing solution for 24 hrs to remove excess nutes and ecourage the roots to grow.

They all had lots of long roots on em and they all looked healthly till i put them in the nft.

I also agree on this, i had a hydro kit and the plants got rootbound and were soaking in water almost all day, they looked the same as yours, you need to get the roots some oxygen

This morning i decided to give them a plain water ph adjusted flush,during the day the ph kept rising up?

Does anyone know why the ph should go up when only using plain water?

I come back in tonight and some of the plants have started to pick up to my surprise.

I will keep you posted.

H