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canoeing sounds like ph or overfert or perhaps heat stress to be honest but I've never done 80% humidity so can't be sure. If you can post a pic that would be great.....also where are your numbers at and how often are you changing out your res?
Ps...if you can't post a pic than e-mail me with one if possible.
I have attached a couple different pictures, two of the canoeing and one of the yellowing.
The yellowing is happening at the canopy level. It is happening to all of my Arctic Sun plants, but neither of my Atomic Haze show any yellowing, save for a couple leaves.
In the past couple days, the ph has fluctuated between 5.7 and 5.9, which is what it is now.
The ppms have grown from 1220 to 1240 since my last res change, which was last Wednesday I want to believe.
The RH is at 65%, temps at 75F.
I'm not sure how close your light is but the first two photos look like heat stress. The third looks like a k def but is there any chance I could see a photo of the yellowing in relation to the rest of the plants? Is it only on the older and/or lower leaves? What medium are you using again? A certain amount of yellowing/browning of the lower leaves IS normal but I've had k defs etc seem low....then begin crawling up the plants madly (my white rhinos did that and ended up w/small amount of mold due to the plant's general health even with good rh) so watch it carefully and see if it "climbs" up the plants
I will move the light further away, the leaves showing the canoeing are the closest to the light.
The yellowing is happing on the top of the canopy. Both new and older growth are showing yellowing.
The girls were planted in RW and I surrounded the cubes in hydroton. It's an aeroponic sprinkler setup so the roots are hanging down into my reservoir while the roots in the air get sprayed.
i was also thinkin heat (i learned lots about heat, the hard way of course) but was waiting for the WH to chime in 1st.:D
Might be time for a system flush.....I'm not a huge fan of the hydroton or the rockwool but there are flaws to every single medium so it's six of one and 1/2 dozen of the other.
I'd flush the system if I were you but I'm just not quite sure how to do that with rockwool. Do you have (or can you get) Florakleen and do a system flush? You have some decent defs showing and I think the problem is probably salt build up related.
Your buds are starting to look very good cm....they are close enough together however that I would definitely worry about mold and fungus. If you aren't spraying them with something (I use Serenade) I would consider it if I were you and DEFINITELY a dehumidifier.
To me it looks like the leaves are cupping due to heat. Mine looked like that when temps got over 100 F in September. Flushing them with FloraKleen is also a really good idea prior to heading into the last half of flowering.
I stole these from Dutch Pimp. :D
Thanks for the replies!
So, I'm going to get Florakleen, Serenade, and a dehumidifier this week!
I agree about the salt buildup in the rockwool... I can see white crusty things on the rockwool and so maybe if I pour RO water through the RW enough until it goes away? I will also do a system flush. Does that mean that when doing a system flush with florakleen the girls don't get any nutes? Wouldn't that increase the def and thus the yellowing? I have the thread about flushing w/ florakleen before harvest bookmarked, should I follow it?
I will also raise the lights and LST the high leaves so they're farther away.
Thanks for the replies!
I got 12 grams for $40 tonight, so I'm happy :)
Sensi Star it was called
Well if the problem is fert buildup in the medium then you don't have a true deficiency....it's actually a def due to a lockout....too much crud and salinity in your medium can affect the roots ability to uptake nutes thus LOCKING things out. Abnormal ph will do the same thing. ;)
You are much better off using the Florakleen for 24 hours than just pouring water through at this stage. I would use 10ml (2tsp) a gallon for 24 hours (watching ph constantly...it WILL shift alot) then replace the system with fresh nutes. Sorry....more water to carry.....:wtf: