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

[Bubba kush]

HGV nutrients are designed to be feed at 3.0 EC
from start to finish. You also need to check the EC and PH of your runoff and adjust accordingly.

 

[slimjimham]

I mean... that's what the guy recommends but don't you think you can just reduce the numbers as needed to get lower??...

I think im sitting around 2.2ec right now in flower
Around 1.2 ec in veg

3.0 just seems crazy high and like I'll need to flush 40% runoff to keep from a major salt buildup?

You guys think I'm still starving these girls? Hmmmm I'm not so sure

 

[chemistry]

@chemistry

Why do you say that? Im still hitting em with 418ml every feed which is like a 5% shot size

You have to keep watering rockwool if your going to grow trees in them, or you PH will be all over the place, then you get the crazy leaf patterns like yours, it's quite a small area block wise for such a big plant, bit like the limitations on the solo cup challenge, only so much root space to pick up nuits.

 

[JohnnyApp]

Your leaf symptoms are the result of root damage caused by fungus gnat larve. Mix up a dilute solution of hydrogen peroxide and apply it directly to your cubes (slabs included), after a few minutes (10-15) you'll see the tiny larve working up onto the surface of the cubes/slabs. Reduce watering and/or improve drainage to correct this issue. Best of luck, Rockwool is a pita in the beginning

 

[slimjimham]

Well it seems the fungus gnats are no more after a couple nematode applications... Gonna but another round to make sure there's not a few left

 

[Phenophiend909]

Ec is way to low for those monsters. U should be 3.0 no problem

 

[SaturdayNightSativa]

Hold up!!!! Are fungus gnats a common problem in RW?! I am switching from coco to RW because I just couldn’t handle the gnats anymore. Everything was clean until one bad batch brought in gnats, then they multiply so fast it was impossible to get rid of them. They got so invasive that even my aloe plants in my house had gnats. I had to shut down the whole garden to get rid of the gnats. I tried everything from covering the top of the pots with a layer of sand(read the gnats couldn’t get through it to lay their eggs in the coco) to applying a LIBERAL layer of neem meal on top of each plant to hydrogen peroxide. It slowed them down a bit but never actually got rid of them.

 

[cottageman]

How much runoff are you getting? Maybe too much? Also leafs sometimes seem to do this on the beginning of flower so maybe some pruning will help you out here. You should be shooting for 120ppm of nitrogen for both veg and flower so if you have that then I don’t think it’s too low n but something could be locking it out. Also I don’t think they are root bound especially if you’re feeding multiple times a day, you can grow giant trees in a 6” cube with no root problems. Maybe you’re overwatering a bit, which may be killing the feeder roots which maybe is causing some root bound issues? Also did you say you’re feeding at night? That might be a source of the problem unless I’m reading it wrong(which is definitely possible)