DYING LEAVES Rockwool. Over watering? Root rot?

Alec420

Well-Known Member
Hello, these plants had a good veg. Although I think I was over watering them but they still looked good. I should add this is the first time using Rockwool, I only have done coco before this.
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So then I flipped it into week 6 of veg
The next couple days all the plants were just wilting. I thought it was just stressed from the different times that were set.(lights on at night & off during day.)
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2 weeks into flower, most plants a start showing deficiencies.
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I noticed throughout the weeks that some plants were doing just fine and most weren’t. The difference between the plants were the healthiest ones were dryer than the dying plants. They were always heavy and not growing as fast as the dyier cubes.
There are some fungus gnats, but not a lot for me to be worried.(I spray once a week of IA)
The roots may have some rot.
It for sure is not getting enough oxygen due to the hand watering.( I water till run off, usually under 5 sec or more. Usually 2 hours before the lights turn off sometimes an hour before.)
PH is usually 5.8
PPM is usually 900-1000( I try to always keep it 950)
Water temp is usually 70-73 F
Then when res is refilled it’s 78F till it cools down
Nutes part A 14-0-8
B 3-13-17
Bloom is idk. I get back you guys on that.
I’m also using phosphorusload, but only for the past week.
So my recent solution clean my res with bleach and rinse it. Then add Orca( bennies) to my res(70 gal open with a water pump).
And for the cubes, I had intsalled these covers under the cube for more surface area to be exposed to air flow. Hopefully drying the cube before the next watering.
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I’m crossing my fingers for this to work. Please give advice,
thank you

Lights on 12 am off 12 pm
Average temps 80-84 lights on
RH 50-65% lights on
Going on into week 4
 

Lucky Luke

Well-Known Member
Has to be something in the flower room that's different than the veg room. The wilting to me is a clue and it all may stem from there. What caused the wilting?? Light stress, under watering, Some sort of an infection, weed killer from something? Temps seem fine, intense light from excess leaf temp??
Sorry if im not being much help.
 

3030/150

Active Member
They look like they are over watered. I've had similar looking problems when mine have had root issues...
 

Alec420

Well-Known Member
The stress has to be from moving the plants, changing the lights on cycle from day to night time. Plus over watering.
I forgot to mention that the part B I had was faulty. The powder would turn into playdo from all the humidity before I even used it and fucked up the chemistry. Which might of been the catalyst for the deficiencies. Then over watering made things worse.
So I had to order a new version of the part B around week 2 of flower. That problem is gone now. As far as nutes go.
 

Alec420

Well-Known Member
Root issues!Can you see them?Or open one up a little so you can see.
Yes, they are some what brown. Just not super slimy.
I just noticed a white slime in my res today. Idk it’s from the bennies or it bad bacteria?
 

myke

Well-Known Member
So I don’t know much about rockwool. You hand water? So it kinda works just like coco?air is pulled in as you water?
 

Alec420

Well-Known Member
I hand water the Rockwool.
It’s supposed to work like hydro. I’m not sure how the air gets in. From what I’ve been reading, it’s seems like that water should carry the O2 from an air stone or something like that.
 

myke

Well-Known Member
Can u check root zone temp?IR thermometer maybe.So im thinking you need to lower your water temp,more DO and maybe increase feeding intervals.Like ebb and flow.But again its rockwool so it may not respond like coco or hydroton.
edit~rockwool holds water from my exp.so im at a loss.
sorry.
 

myke

Well-Known Member
ok so re reading,you said the heathiest ones were dry so there feeding.the sick ones are wet there drowning!They need air,how to do that im not sure.
 

Kingrow1

Well-Known Member
I hand water the Rockwool.
It’s supposed to work like hydro. I’m not sure how the air gets in. From what I’ve been reading, it’s seems like that water should carry the O2 from an air stone or something like that.
Rockwool and coco have pore space enough that it can never be fully saturated. In the wrong temps and low light it does not perform well though. Rockwool is easy its just everything else that makes it hard work :-)
 

Alec420

Well-Known Member
Can u check root zone temp?IR thermometer maybe.So im thinking you need to lower your water temp,more DO and maybe increase feeding intervals.Like ebb and flow.But again its rockwool so it may not respond like coco or hydroton.
edit~rockwool holds water from my exp.so im at a loss.
sorry.
I think the major problem was feeding 2-1 hour before lights turn off. Which means the plants are just sitting in water for 12 hours before they eat again.Creating this horrible domino effect of over watering.
Another solution I have now is to water the pants 3 hours before lights turn off. Giving some time for the plants to eat.
Update - the plants seems to be responding well with the trays under the cubes. More of the cubes felt less heavy than before, plus the leaves don’t look at droopy as they did. I would lower the waters temp, but I don’t know any cost effective ways to do so. Frozen water bottles? It feels too slow to do this.
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Alec420

Well-Known Member
Here’s another room using the same nutes. Medium is coco now. This is going to be a killer grow. Week 2
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myke

Well-Known Member
Cold water should come right out of your hose no? Mix nutes feed. If your letting it sit that’s why it’s warm.
 

Kingrow1

Well-Known Member
I think the major problem was feeding 2-1 hour before lights turn off. Which means the plants are just sitting in water for 12 hours before they eat again.Creating this horrible domino effect of over watering.
Another solution I have now is to water the pants 3 hours before lights turn off. Giving some time for the plants to eat.
Update - the plants seems to be responding well with the trays under the cubes. More of the cubes felt less heavy than before, plus the leaves don’t look at droopy as they did. I would lower the waters temp, but I don’t know any cost effective ways to do so. Frozen water bottles? It feels too slow to do this.
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View attachment 4388631
Soil, rockwool, coco and peat all do best in an environment that dries them down some - its not overwatering per say as you see.

Pita rockwool :-)
 

Alec420

Well-Known Member
Cold water should come right out of your hose no? Mix nutes feed. If your letting it sit that’s why it’s warm.
It’s pretty hot in my area high 80s to high 90s.The water comes out warm like 74-78 depending on the day.
 

myke

Well-Known Member
Not sure but plan ahead. How many gallons ea feed do you need?you have coco grow also?
Surely you don’t need 70 gallons a day?
You may need a chiller.
 

Alec420

Well-Known Member
Maybe 7 gal a feed. I never really checked.
They’ve been drinking less water lately. And had to dump res water because it was too old.
I’ll think of getting one after this run.
Never used one before, so should be fun once I have one. Heard great things about them.
 
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