Dying leaves. Root rot? Deficiencies? Not enough aeration?

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.)

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.
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
 

The Gram Reaper

Well-Known Member
I think they are drinking all the water/nutes you give them right away and starving for the rest of the light period. They are most likely root bound in those rock wool cubes and the one watering isn't enough to sustain them. You need to get them on an auto feed or water them two/three times a day when the light is on. Easy to do with those tables, just pricey for pumps/reservoirs.
 

Alec420

Well-Known Member
I think they are drinking all the water/nutes you give them right away and starving for the rest of the light period. They are most likely root bound in those rock wool cubes and the one watering isn't enough to sustain them. You need to get them on an auto feed or water them two/three times a day when the light is on. Easy to do with those tables, just pricey for pumps/reservoirs.
So you are saying that even though the cubes are still soaked after a whole 24 hours. I should feed more than once a day. I just want to clarify.
The cubes are growing algae due to all the waterings.
FYI
There are a hand full of plants that look perfectly fine with little to no stress. No leaves are dying like crazy compared to the rest of the litter. So they seem to be fine with their feedings. Which makes it weird why these others are not cooperating.
 
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The Gram Reaper

Well-Known Member
So you are saying that even though the cubes are still soaked after a whole 24 hours. I should feed more than once a day. I just want to clarify.
The cubes are growing algae due to all the waterings.
That definitely sounds like root death/no uptake, sorry for misreading it.

Grodan has a guide for their rockwool:

https://grodan101.com/sites/default/files/leaflets/Water_ENGLISH_lo-res.pdf

"When there’s no light, don’t water - the plants are resting"

"Keeping Grodan drier at night helps prevent root problems and also produce a more generative plant (better blooming, better setting of fruits)."

Wish I could be of more help.
 

The Gram Reaper

Well-Known Member
"Kick the Bucket Method

The easiest way to determine if container plants (in Grodan) need water is to simply kick the container slightly. If the pot moves, it’s time to water!"

Ok, it does sound like over watering combined with a root/uptake issue.
 

Alec420

Well-Known Member
Yeah... that’s what I thought. Thank you for the links!
"Kick the Bucket Method

The easiest way to determine if container plants (in Grodan) need water is to simply kick the container slightly. If the pot moves, it’s time to water!"

Ok, it does sound like over watering combined with a root/uptake issue.
 
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