DWC - my plants just die

[hampkongen]

Hey growers

i got an big issue with my plants.
Strain: Amizia haze and Critical Kush

I had 7 plants in my grow room for 600W HPS with a cool tube.
They are growing in a home made DWC with 20L buckets each.
They are having 1 oxigine stone each bucket.
PH between 5.2-5.8. I adjust about every 3 days.
The plants are in jiffy cups and leca nuts.
Change water totaly 2 times.

BUT!

After 4 weeks in flowering 2 of my plants died. In about 3-4 days. No matter what i did, they just died At that time, they was the 2 biggest and prettiest plants i god. verry nice plants.
Now is my new biggest plant Amazia Haze just died. I tried to give her more nutrients but its dossent seem to work.

And i only got 4 medium plants back
The PH was 5.6 at each bucket, but they just start drying out. The Amazia dried out on 1 night.

The plants just dry out verry fast, and they got the right PH level, and enought of nutrients.
Simply just dry out. But how? Too much nutrients because i don't change water every week?

 

[Mono]

If they dry out then they are needing more water? Not a hydro grower so not too sure, but adding more nutes is quite often the last thing you should do with a sickly plant.

Maybe you could try soil until you have more experience? It's much more forgiving.

 

[Mono]

Have you got any pics, more info like humidity, temps, etc?

 

[hampkongen]

I have grown in soil for some time. And Hydro for a least the same time. But its first time DWC, because it scout me easier?

Mono: No pic, but i can take some tomorrow.
I have no humidity info. And the temperature depends on witch time of day. The wether in my country are switching from minus to plus 10 degrees.

And why does only some of them die, and only the biggest? They scout be the most resident. I dont think its the heat. I got an cool tube. But in my other grow tent they have not. (veg tent)

 

[hampkongen]

DWC = deep water culture. They live in water. So i'm thinking:
Not enought air?
To much nutes?

 

[JJ Bones]

What is your PPM and what is the water temperature?

 

[hampkongen]

PPM ?
Its about 28 degrees celcius.

 

[goathead]

Does temperatutre remain constant when ladies are put to sleep.? I mean after warmth of the light is turned off is there the possiblity that over time from the the temp dropping out that they apeared to just die all at once. when they actually tried to recover after being to cold due to no heat when nite time. It may seem as though they just died but may have had problems you did not notice cause they were lookin healthy. so many possiblities exist !

 

[JJ Bones]

PPM ?
Its about 28 degrees celcius.

That is your problem, this is way too hot of water for a hydroponic system. You need to be around 18-21 C

 

[hampkongen]

At my veg flowers under 250W HPS are about 30 Degrees celcius right now.
And flower 24.5
I found out that the airpump have been defect and only working on half time. So i think thats the problem with my last dead plant.
A plant in DWC sith out air in 12 hous will die fast?

But now i thinking. The next grow. How do i prepare for this could happend again? It dossent seems like they getting to much nutes.
And the 2 plants who died came from the same mother plant. And it looks pretty much as a auto flowering plant? Because she was way to much faster than the other? So maybe the genes, and missing air at my Amazia could be the problem?

Cannabis can grow in 24.5 degrees? at the wormest. ?

 

[hampkongen]

I got some pic if you wanne se? but its only show some healthy plants, and the dead heanging one

 

[Thunderthys]

I would say ur getting to cold at night and the heat I the water isn't helping but the nutes won't do much there I it's to cold at night... Just a night and day shock

 

[hampkongen]

Why do you think its to cold at night?

 

[Thunderthys]

I'd have to say the cold at night I have a small dwc runs at 30 for a while just to root but its more like 22 now but I've had plants in the past wilt out fast and not come back at all from a cold shock

 

[Lurch Farmer]

 

[Lurch Farmer]

 

[Lurch Farmer]

YOUR PROBLEM IS YOUR TEMPS

I am fighting the same problem with temps. water 45 f -65 and air 35-70 f
cold or hot water cause nute lock out .
cold air will cause "self covering" and the appearance of dieing

P.S.
A sig with a link to your journal would be helpful
MY bad You aint got a journal.
It helps if you supply ALL the Needed info of what we are trying to diagnose.

 

[Lurch Farmer]

My commputer thought you needed to read my post like 3 times

 

[JJ Bones]

The hot water can bring on root disease to your plant. Your water cannot hold a lot of oxygen when it's too warm, your roots could be drowning.

 

[hampkongen]

then what do i do? I have an tower fan blowing on my plants at the buttom, So the temperature came down to 25 C.