Rockwool pros??? Any clue whats going on here guys???

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slimjimham

slimjimham

Ok so I'm banging my head up against the wall... ive tried what I feel like is everything

higher ec, lower ec, higher ph, lower ph, ramping the lights up slower when moving to flower

basically I'm growing in rockwool 6x6x6 blocks, when i move the plants to flower i put them on unislabs

ec in veg is 1.4
ec in flower is 1.8

ec in blocks is 2-6 with my grosens meter





any idea why every time i put my plants in flower around week 2 they start yellowing out prematurely?

I'm feeding every hours for a 1m20s with 2 (2gph drippers)

and the plants are so large i need to give them 3 night irrigations or they will dry back to 7% or so which obv isnt good....

what do you guys think?

I use HGV nutrients, on a dosatron system

I recently started using UC Roots in the system hoping if it was a root rot issue itd help (which i dont think it is)

I'm using RO well water

I've also tried more frequent irrigations... seems like every hours is pretty good for the charts though



WHY THE HELL ARE THE PLANTS ALWAYS SHOWING DEFICIENCY STARTING WEEK 2 OF FLOWER?!

its not a nutrient salt buildup since theres plenty of runoff... in the room pictured i gave it veg nutrients the first two weeks of flower to see if that'd help and they seemed to take off a bit quicker but in the past they got flower nutrients right when they went in the flower room


help me guys... my home grow looked fucking perfect, not my commercial spot is struggling to get dialed in
 
Aqua Man

Aqua Man

Staff member
Supporter
Ok so I'm banging my head up against the wall... ive tried what I feel like is everything

higher ec, lower ec, higher ph, lower ph, ramping the lights up slower when moving to flower

basically I'm growing in rockwool 6x6x6 blocks, when i move the plants to flower i put them on unislabs

ec in veg is 1.4
ec in flower is 1.8

ec in blocks is 2-6 with my grosens meter





any idea why every time i put my plants in flower around week 2 they start yellowing out prematurely?

I'm feeding every hours for a 1m20s with 2 (2gph drippers)

and the plants are so large i need to give them 3 night irrigations or they will dry back to 7% or so which obv isnt good....

what do you guys think?

I use HGV nutrients, on a dosatron system

I recently started using UC Roots in the system hoping if it was a root rot issue itd help (which i dont think it is)

I'm using RO well water

I've also tried more frequent irrigations... seems like every hours is pretty good for the charts though



WHY THE HELL ARE THE PLANTS ALWAYS SHOWING DEFICIENCY STARTING WEEK 2 OF FLOWER?!

its not a nutrient salt buildup since theres plenty of runoff... in the room pictured i gave it veg nutrients the first two weeks of flower to see if that'd help and they seemed to take off a bit quicker but in the past they got flower nutrients right when they went in the flower room


help me guys... my home grow looked fucking perfect, not my commercial spot is struggling to get dialed in
Cause you switched to bloom nutes is my guess. So let me ask did you switch to bloom nutrients?
 
slimjimham

slimjimham

thats what I was thinking since i used to go straight to flower nutes but this round I did veg nutrients for the first two weeks of flower... just switched them to flower yesterday and these are the ones pictured
 
cemchris

cemchris

Staff member
Supporter
Have you tried using a different feed or ratio? Have you tried to just keep feeding them the veg nutes they were doing so good with? I grow some big plants in 6in but that plant is fucking huge for that cube. Specially if you are only talking week 2 of flower. I thought it was a 4in cube by the picture before I read the post. Most of the time people are going 6 to 8 or 8 to slab when they start getting that big or loose in 5 gals. Problem is your root zone is prob become such a tight mass that you might be getting buildup in spots.

I mean I'm just throwing some stuff out there but it could be a number of things.
 
slimjimham

slimjimham

haha im leaning to root bound or issues lie you're talking about i just bought some loose gro-cubes to drop the 6x6x6's in 5 gallons like you mentioned... the top blocks are like bricks... often times I'm finding water is running off the top blocks because the roots are so dense in the block the water cant penetrate it... i think this is finally going to solve my issue... i guess root bound plants can show deficiencies when there shouldn't be like what I'm experiencing.

its always like the start of the 2nd week of flower.... im assuming thats when the roots have doubled in size and start causing the issues

FINGERS CROSSED
 
Dirtbag

Dirtbag

Have you tried using a different feed or ratio? Have you tried to just keep feeding them the veg nutes they were doing so good with? I grow some big plants in 6in but that plant is fucking huge for that cube. Specially if you are only talking week 2 of flower. I thought it was a 4in cube by the picture before I read the post. Most of the time people are going 6 to 8 or 8 to slab when they start getting that big or loose in 5 gals. Problem is your root zone is prob become such a tight mass that you might be getting buildup in spots.

I mean I'm just throwing some stuff out there but it could be a number of things.
Hes got that 6" cube sitting on a unislab if you check out the first pic again.
 
slimjimham

slimjimham

I think the issue is it's getting rootbound in the 6x6x6 block making it very hard for water/ nutrients to get through the way they should... also just showing signs of root bound?

Im thinking putting the 6x6x6 in the loose gro-cubes will allow the roots to grow outward instead of staying balled up in the blocks🤷‍♂️

Worth a try bc those blocks are FULL of roots and it's showing signs week 2 of flower and on (14+days) as the roots are exploding 🤷‍♂️

Also heard rootbound may cause plants to be overly sensitive even to relatively low ec... show signs of deficiency when you shouldn't be seeing that...

Fingers CROSSED!
 
cemchris

cemchris

Staff member
Supporter
I think the issue is it's getting rootbound in the 6x6x6 block making it very hard for water/ nutrients to get through the way they should... also just showing signs of root bound?

Im thinking putting the 6x6x6 in the loose gro-cubes will allow the roots to grow outward instead of staying balled up in the blocks🤷‍♂️

Worth a try bc those blocks are FULL of roots and it's showing signs week 2 of flower and on (14+days) as the roots are exploding 🤷‍♂️

Also heard rootbound may cause plants to be overly sensitive even to relatively low ec... show signs of deficiency when you shouldn't be seeing that...

Fingers CROSSED!
Getting root bound isn't necessarily the issue. It's more of an issue as they get more root bound your margin of error gets smaller and smaller and you need to be more dialed.

Stacking 6 to 8 isnt a good idea unless you are running drippers in the 6 and the 8 together. It does work tho.

What exactly are you feeding them?
 
cemchris

cemchris

Staff member
Supporter
also what exactly is each dripper putting out in ml per feed? How long are your runs. Have you tested the run to make sure its putting the same volume across all the drippers? Is this isolated to some plants or are they all doing this? Humidity solid when the lights are off?
 
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