Does this look like heat stress?

[NPK]

Hey folks, hoping to get a little feedback on my situation. I noticed last night that the leaves on my Odyssey clones (nine days in soil) are curling downward. It's not because of over-watering--I suspect it's a heat issue. The clones are beneath a 600-watt light; temps got as high as 93 degrees, with a low-ish RH of around 35 percent. I raised the light (plants are maybe a foot below now), trained a fan to blow between the lens and the top of the canopy, and gave the girls a good watering. This morning the temps were down to 86-87 (should be OK with CO2), but the curling was still in full force--so now I'm wondering whether it's the beginnings of nute burn. Anyway, here's a pic:

I'm perplexed because these girls' sisters, one week older and one light over, look fine despite similar conditions and the same treatment. What say the great minds of IC Mag?

 

[sproutco]

You were right to raise the light. Looks like too much nitrogen from the "claw" leaves. Why dont you give more details about your grow. Soil type and what is in it? PH? Directions for testing are in my signature. What are they being fed and how much? How is your watering? More specific details will get you better answers from others...

 

[MTF-Sandman]

Did that clone come from a flowering plant?

 

[NPK]

Yikes MTF, I hope not! I'm in Northern CA and got it at a dispensary.

Sproutco, some deets about the medium: it's Sun Land brand organic potting soil fortified with all the good stuff--worm castings and so forth. Very light and fast-draining even before I added perlite, and my older clones of the same strain like it. The past couple of waterings I did water with full-strength ferts, though. And seeing my other clones even closer to the light than these were with no ill effects tells me that I've probably over-fertilized the young'uns. I'll go back to plain ph-adjusted water and see if that eliminates the problem.

I will also check out your soil ph testing link. Looks like you've got some good edjumacation going on there.

 

[sproutco]

Sounds like a good plan. If you don't get a ph meter then at least get ph test strips from a petstore in the aquarium section. They will only cost a few dollars. Ph range 4-7 or close to where you should be growing would work. They do suck however for not being really accurate and hard to read.

 

[sproutco]

I just want to give credit to Mtf Sandman for teaching me about claw leaves and too much ferts.

 

[NPK]

He was helpful to me, too, when I was pulling my room together. Guy's probably lent a virtual hand to hundreds of people here--thousands by extension!

 

[Tunefull]

Hello NPK

Dont see you in here often m8(lucky guy!!!!)*smileS*


And yes MTF is a helpfull guy(He be growing pot for the lord in heaven i bet)
And a lot of the other posters in here are helpfull(ANd must get asked same things a lot))

Anyway enough bragging them up(they will start to belive it soon!!)

I got no help to offer you NPK
But saw your name so had to reply...lol

 

[Blackmelo]

the curling of the leaves is from too little airflow.

Temps are way too high anyway so there is not a big alternative here...

You'll need to get yourself a good extractor fan.

 

[MTF-Sandman]

I'm in Northern CA and got it at a dispensary

Hmmm...kinda looks like a reveg curl, but if there's no mutant leaves (couldn't tell from pic) it's probably nute, root or environment based. Thought I saw a few pistils in that pic tho which could indicate that the affected clone came from a plant in flo

Heat could definitely be a contributing factor...maybe the others are just a hair from showing similar problems?

Can you check the roots without damaging the plants? Maybe a dry pocket in the soil mix or something else goofy?

Definitely wouldn't hurt to give them a good flush of straight H2O to make sure there's no nute OD's though.

Ya'll quit talking like that about me...it's gonna give me a big head...I'm just trying to keep my karma in check for when I need it to pull my ass outta the fire

 

[sproutco]

Thought I saw a few pistils in that pic tho which could indicate that the affected clone came from a plant in flo

Click on it to enlarge



???

 

[MTF-Sandman]

^^Yeah, that's what I thought were pistils...