Yellow leaves and curly leaves

[CannaViridis]

Hi Guys,

I assisted my friend with het medicinal grow for her MS.

I’m a bit puzzled to why these plants are this yellow and not growing. There is twisted growth aswell and the plants are hardly growing.
You would say N deficiency, but EC is on point.

GHE tri-parts nutes
Drip system but the roots are in the resevoir, so also DWC.
RH 75%, 25c/77f
EC 1.2

 

[Edinburgh]

Yellow leaves are caused by a nitro deficiency, or to much food witch can cause lockout, if it's nitro you can throw some fresh perlite, but first give a light flush and check pH correct if nessasary, cut back on nutes if pH way off probably due to overfeeding, if pH good give some nitro, allso if were mine I would give light even prune to improve airflow and get branches to the light.

 

[GanjaJack]

I run a 5 gallon DWC with 3 part GH myself.

And that is PH imbalance.

Can you give information on how you're making your mix?

How I do it is fill a 5 gallon bucket with my well water, which is hard as a rock..... 8-9ph... SO I fill my bucket it up, then I add my nutes.... Once I switch to "full bloom" formulae, after I get done adding all my nutes, my PH runs at 6.0.

Without PH adjuster.

The flowering series makes your PH drop pretty dramatically. I'm not sure if this mix was made locally to me or what, but, it's nice that I don't have to mess with PH down.

 

[jguit]

Not a RDWC grower but it would be helpful to know your starting EC/pH and what the EC/pH in your RDWC is after a day or so.

Wait.. Your roots are sitting in stagnant water? Do you have some air stones in your reservoir?

It does look like your having some sort of root problems. My guess is suffocation.

 

[CannaViridis]

Not a RDWC grower but it would be helpful to know your starting EC/pH and what the EC/pH in your RDWC is after a day or so.

Wait.. Your roots are sitting in stagnant water? Do you have some air stones in your reservoir?

It does look like your having some sort of root problems. My guess is suffocation.

There is a lot of air in there. Huge ass airpump and 2 airstones per resevior. But I’ll check the roots be sure

 

[CannaViridis]

I run a 5 gallon DWC with 3 part GH myself.

And that is PH imbalance.

Can you give information on how you're making your mix?

How I do it is fill a 5 gallon bucket with my well water, which is hard as a rock..... 8-9ph... SO I fill my bucket it up, then I add my nutes.... Once I switch to "full bloom" formulae, after I get done adding all my nutes, my PH runs at 6.0.

Without PH adjuster.

The flowering series makes your PH drop pretty dramatically. I'm not sure if this mix was made locally to me or what, but, it's nice that I don't have to mess with PH down.

I fill the resevior. Add silicate powder, wait 5 mins. Add the dark bottle of ghe, mix it, wait 2 mins then add green and red.
I’m gonna flush it all out in two days make a new batch. See how the plants repsond.

I’ve had a lot of ph instability before due to expensive but shitty nutes. The leaves looked different then. Not as universally light green yellow.
also the ph is rather stable. 5.6-6.3 slowely changing

 

[jguit]

The droop and overall pale unhealthy look is what's making think something is going on with the roots.

 

[Moshmen]

What light ? Looks like some light stress as well ?

 

[Moshmen]

The droop and overall pale unhealthy look is what's making think something is going on with the roots.

For sure I’m not a hydro guy but the ec seems a bit much at this stage as well? Could be causing some uptake issues

 

[CannaViridis]

What light ? Looks like some light stress as well ?

You could also be on the something, I’ll also dimm them. They are led QB’s

 

[jguit]

For sure I’m not a hydro guy but the ec seems a bit much at this stage as well? Could be causing some uptake issues

Possibly.. 1.2 EC isn't really a whole lot though, at least not where i'd think you'd lock anything out. Especially decent size plants like he has.

 

[CannaViridis]

The droop and overall pale unhealthy look is what's making think something is going on with the roots.

Its would a conincidence if that would be in both resevoirs. I’ve seen rootpeoblems in this set up before and the leaves ussualy dont universally go yellow like this. But more randomly with burn. But I’ll check them to be sure.

 

[CannaViridis]

Possibly.. 1.2 EC isn't really a whole lot though, at least not where i'd think you'd lock anything out. Especially decent size plants like he has.

I’m gonna check the roots, change the water and nutes and dimm the lights and look for improvements.

 

[CannaViridis]

Possibly.. 1.2 EC isn't really a whole lot though, at least not where i'd think you'd lock anything out. Especially decent size plants like he has.

Pretty sure ec is not the problem, I’ve used these nuts kn this setting 15 times and 1.2 was always the sweet spot.

 

[jguit]

I’m gonna check the roots, change the water and nutes and dimm the lights and look for improvements.

Sounds like a solid plan. Check your reservoir temps while you're at it and make sure your pH is stable.

 

[growsince79]

What light ? Looks like some light stress as well ?

+1

 

[growsince79]

Possibly.. 1.2 EC isn't really a whole lot though, at least not where i'd think you'd lock anything out. Especially decent size plants like he has.

Probably not enough... Raise the light...

 

[jguit]

Probably not enough... Raise the light...

Certainly a possibility. I'm currently at 2.1 EC in my DTW coco grow. I was starving my plants @ 1.5 EC which seems to be what most folks recommend.

 

[Moshmen]

Certainly a possibility. I'm currently at 2.1 EC in my DTW coco grow. I was starving my plants @ 1.5 EC which seems to be what most folks recommend.

That’s crazy. Looks like I’m gonna have a serious learning curve when I move to rockwool here this summer . If I fed my soil plants 2 ec they would hate me lmao

 

[Mr.GreenthumbOG]

Your running a pretty low VPD, plants are not transpiring.