Rockwool Experts Needed

[painroad]

I'm getting zero to no growth using 4" cubes sitting on top of 50/50 croutons and perlite. I presoaked for 24hrs at 5.3, then i gave a small amount of nutes 2.5ml/gallon(GH) using RO. About to 2 days later the plants looked like i fried them. PH was 5.8ish when i feed. It's been 8 days and only one has a tap root showing, and they look worse.
The leaves are droopy also, i thought to much water but the cubes are pretty light as the 50/50 pulls the water from the 4"cube. I would like to post a pic... been a while since i uploaded anything and can't remember how. I've ran this setup for a while and can't recall it taking so long to show root or growth. Strains are Alien OG, Cherry Pie, Grape Ape. After i fried them, i just gave ph water as needed. That has been 7 days. I mean they look like a slow death?? If i can figure out how get a picture up i can show.

I'm in a tent with temps ranging from 68-75, RH is about 35%, i need a filter for my humidifier, so i can raise that up. 1k hps. Clones were nice and healthy prior to going in the room and the nute burn. Any clue, seems like over feed over water but i just don't feel like i'm over watering them. Gonna try to figure out how to get a pic... Thanks everyone!

 

[LyryC]

Are these Grodan Cubes?

24 hr soak is pointless. One hour, maybe two. Squeeze the excess water out, then you soak them in your nute mix by just pouring it onto the cube, letting it drain on its own at first and then very lightly squeeze excess out, finally trans planting.

So 4 inch cubes from grodan can be soaked with as little as 500ml or half a liter of nute mix. You could use more but its not needed.

more info please, maybe you have an infestation of something causing the problems behind the scenes so to speak.

Use the advanced feature and upload pictures from your computer with the Manage Attachments button.

Also what is the feeding schedule? I hope its not days apart, rockwool is meant to be watered daily or even more frequently if everything is optimal.

 

[painroad]

These are from last week after i fried them.They now look worse. I can't get any current pics until tonight. Yes i have been skipping days, thinking i over watered. I dipped in azatrol about 10 days ago and they seemed fine until i feed and put under the HPS. Haven't grown inside in a while, feeling pretty rusty. I know these strains are Hybrids, so they're pretty sensitive to nutes and such. In the old days with this setup i would veg (super silver haze) about a week and flip. After 10 days they would be in my lights! I know i'm screwing something up.

 

[Moppel]

lights to close maybe?

 

[painroad]

lights to close maybe?

Don't think so... They're off to the side of the tray, about 20" away.

 

[LyryC]

Okay this seems to be something that shocked the root system or disrupted it, or even killed it. Did you have pearly white roots from the starter cubes? You said healthy clones so im assuming completely rooted all the way thru the cube before trasnplant or just one little root sticking out?

I had this happen to me, but I had extreme heat and a lack of water. There were a few plants that died but everyone either was unscathed or they fixed themselves and turned out good.

I recommend going to the infirmary and posting this issue. Heres the link:

https://www.icmag.com/ic/forumdisplay.php?f=83

best of luck mate. Baffled as much as you

 

[Crooked8]

i only run rockwool and overwatering seems unlikely. letting them get too dry can cause this. also i think presoaking that long is totally overkill. cant hurt though. i presoak my tray of empty cubes without plants in it with just ro water not even phd for like 4 hours. then when i transplant i add the nutes and check ph. 5.3 is low. id go to 5.8 that is ideal.

 

[painroad]

i only run rockwool and overwatering seems unlikely. letting them get too dry can cause this. also i think presoaking that long is totally overkill. cant hurt though. i presoak my tray of empty cubes without plants in it with just ro water not even phd for like 4 hours. then when i transplant i add the nutes and check ph. 5.3 is low. id go to 5.8 that is ideal.

5.3 was the soak to bring down the ph from the cube it self. This has always helped with ph rising. I rinsed and feed with 5.8-6.1. The cubes feel light so maybe under watering? I normally use 6" cubes, but used the 4" that's all that was available when i went to the shop. So i'm gonna start watering daily with 1/4 strength. Not sure what else i can do. Roots weren't exactly pearly and shinny!

 

[LyryC]

Describe those roots

 

[painroad]

Describe those roots

Some of the kids were white, and some were light brown... very light brown. The tap root that finally popped out in the 4" is definitely white. I Should also add that i used a small dose of 29%h202 at 1.5 ml /gal. Never had any issues with this before either. That was about 4 days after they original nute burn/light burn

 

[Crooked8]

Just go with the 1/4 to 1/2 strength nutes and make sure you keep that rockwool wet. Its hard to overwater rockwool because it drains so well.

 

[LyryC]

Well you certainly have a grasp on what you are doing. If these aren't special plants I would replace them. The damage will take lots of time to repair and the stress could have altered the genetic code slightly and hinder your yield/quality.

Plants adapt to their environment and the elements in it, so your plants can probably pull through for you with much attention love and care. Although it might be more logical to just replace them or dispose of them due to the time frame required for the turn around.

Just my for ya.

Pictures would help, did you try the infirmary?

 

[Shulman]

how often are you watering?do you hand water?top feed drip normally works well with cubes if the water is the right ph

 

[painroad]

Well you certainly have a grasp on what you are doing. If these aren't special plants I would replace them. The damage will take lots of time to repair and the stress could have altered the genetic code slightly and hinder your yield/quality.

Plants adapt to their environment and the elements in it, so your plants can probably pull through for you with much attention love and care. Although it might be more logical to just replace them or dispose of them due to the time frame required for the turn around.

Just my for ya.

Pictures would help, did you try the infirmary?

I spent almost $200 on these bastards! I only grow once or twice a year these days. So no way can i toss them. These strains are pretty legit, Cherry Pie is a very nice. I took some pics but they don't show a lot due to camera phone.
As i was looking at the pics i noticed my sulfur burner hanging. I ran this once the day before i put the kids in the tent. The bowl was full still, I wouldn't think the burner would be a problem "off". It's actually a vapor, not a burner. The sulfur just vaps to liquid. The tap roots have reached the bottom of 3 other cubes.
I'm gonna just start watering 1X daily. The cubes are light colored and not heavy at all. From past experiance, the bottom of the pots pull the air/water from the cube. I'm guessing i got some sensitive as clones, and the nutes and light shocked these kids?? Will have to continue with what i'm working with.
If i can't fix the problem myself, then i shouldn't even be growing. Here are a few pix. I didn't get a chance to post to the infirmary. Maybe i post something with a link. I've been tied up so never got around to it.
~Pain

 

[painroad]

how often are you watering?do you hand water?top feed drip normally works well with cubes if the water is the right ph

I use top feed sprayers, the first feed was a dunk in the bucket. After i burned them i gave straight water every other day. I just gave them a real small amount of nutes, along with some h2o2 last night. I'm hoping it's just a shock from the light and nutes. I hope to see more tap roots tonight. Once i see tap roots i can definitely feed 1x a day until week 2 of bloom. Then i'll up it 2x.... if they can recover!!

 

[Crooked8]

They need more moisture

 

[Crooked8]

You could hit them 2x a day or more already. During veg, straight from the ez cloner into delta 8s i hit them with light nute solution in a flood and drain 6x a day. I never have any issues. Plants take off like rocket ships regardless of the strain. I hit them once for every 4 hours during veg. In flower i hit them 2x daily. Rockwool drains super well. As long as you arent hitting them with tons of nutes you can hit them a lot. Look at dwc, they literally sit in their food all the time. Id hit them more, especially if they are light in color and not heavy. Thats bad news. You need some block covers too.

 

[painroad]

You could hit them 2x a day or more already. During veg, straight from the ez cloner into delta 8s i hit them with light nute solution in a flood and drain 6x a day. I never have any issues. Plants take off like rocket ships regardless of the strain. I hit them once for every 4 hours during veg. In flower i hit them 2x daily. Rockwool drains super well. As long as you arent hitting them with tons of nutes you can hit them a lot. Look at dwc, they literally sit in their food all the time. Id hit them more, especially if they are light in color and not heavy. Thats bad news. You need some block covers too.

Yea i'm sure it was the over dose of nutes from last week, I'm hoping they recover soon. I got some panda film that needs to be cut. Good looking out!

 

[Crooked8]

Anytime! Im a huge fan of rockwool. You ever use slabs? They work really nicely. I used to veg in grodan deltas and just shove them in a tray full of rockwool chunks. I used to spend like 200 on 6 bags each run. This was stupid and messy. Now i run either uni slabs or the big boys and everything is better and cheaper! Also being able to leave the bag on, keeping all light out, is awesome. They still breathe well. Using the panda film can limit the aeration a bit and cause bacteria/mold/mildew growth and brings up the temps in the root zone. Which is risky for root rot. Just my experience not sure if your res has a chiller. Your plants will bounce back no sweat

 

[painroad]

Anytime! Im a huge fan of rockwool. You ever use slabs? They work really nicely. I used to veg in grodan deltas and just shove them in a tray full of rockwool chunks. I used to spend like 200 on 6 bags each run. This was stupid and messy. Now i run either uni slabs or the big boys and everything is better and cheaper! Also being able to leave the bag on, keeping all light out, is awesome. They still breathe well. Using the panda film can limit the aeration a bit and cause bacteria/mold/mildew growth and brings up the temps in the root zone. Which is risky for root rot. Just my experience not sure if your res has a chiller. Your plants will bounce back no sweat

I never have tried the slabs, i always do the 50/50 and had some great results. I've used square plastic pots in the past, not the GEOPOTS. No chiller either, just 3 part with some protek, and H202. The H202 seems to help prevent any funk in my res. When i use the panda film it's just to cover the block, not the whole tray. I think that's what you ment? Yeah, i hope they do bounce back. I Think once the regular daily feeding are allowed by these finiky kids should be good to go. My buddy ran all these and said they're very nute sensitive.