Can anyone tell me what is causing this leaf curl

I have recently lollipopped this plant and three other the other 3 are looking really good and this one just seems to have some kind of stress or deficiency that I have yet to see its always between 40-50 humidity and Temps are always between 70-75 please help or any advice would be appreciated also the plant has been in flower for around 2 weeks maybe I popped it to early idk

,,..........m

Also I've check for pests with a microscope and didn't see anything

What about a decent photo with the lights on it's difficult to tell anything from the one shown.

From that picture it looks like it could be too much N

I'll get a picture with natural lighting when I get off work sorry was in a rush when I took the picture its also under a 3000 w famurs led and im growing in coco/of

What are the temps/humidity levels in your grow space?

Only time I've seen this personally is when I unplugged my exhaust on accident for a day and came back to a 98°f closet. After a few days back at normal temps the leaves uncurled.

Also, check to be sure your lights aren't too close to the plant. Even if the space itself isn't hot, if the surface temp of the leaf is hot, it can cause that. ESPECIALLY if the "tacoing" is mainly happening on the upper leaves and not the lower ones

Tmurrayftw said:

I'll get a picture with natural lighting when I get off work sorry was in a rush when I took the picture its also under a 3000 w famurs led and im growing in coco/of

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Looks like too much light. Leaves are curling up. Also looks like a nitrogen toxicity. Hard to tell with the lights on. Most likely nitrogen toxicity. Here was my experience with it.

Tmurrayftw said:

I have recently lollipopped this plant and three other the other 3 are looking really good and this one just seems to have some kind of stress or deficiency that I have yet to see its always between 40-50 humidity and Temps are always between 70-75 please help or any advice would be appreciated also the plant has been in flower for around 2 weeks maybe I popped it to early idk

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Looks like heat stress!

Heat stress and likely K deficient. Many varieties require additional K during the initial bloom phase.
Potassium also aids in heat stress.

Back the lights off a little and consider adding silicons. This a good way to get some additional K as well.

light burn if it's only up top.

I regularly read diagnosing of whatever deficiencies, in all the time I've used hydro I've never had any deficiency ever?
I've fkd up and made the same mistakes as others with run off, temps, ec etc which in turn intoxicates them with to much?
Where do these differences come from, is crap nutrients or what?

Maggs707 said:

Looks like heat stress!

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How could it be heat stress if my Temps are low and my humidity levels are perfect for flowering

HydroKid239 said:

light burn if it's only up top.

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Most likely nitrogen. I had the same thing when I was using miracle gro and had nute spikes. It progressed the first few weeks of flower, even burned one of the buds. Removed the spikes and flushed her real good. She was alright after that

Tmurrayftw said:

How could it be heat stress if my Temps are low and my humidity levels are perfect for flowering

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Radiated heat.
Put a thermometer on the canopy?

My lights are hanging around 20 inches from canopy none of my other plants are showing any kind of light stress or any other deficiency for that matter its weird ive never had anything like this happen

Raspberrykiwi said:

Most likely nitrogen. I had the same thing when I was using miracle gro and had nute spikes. It progressed the first few weeks of flower, even burned one of the buds. Removed the spikes and flushed her real good. She was alright after that

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Yours don't have the tacoing which is the clue its heat/humidity. Nitrogen toxicity is usually seen with burnt tips, dark green leaves, and/or leaf tips curling down.

Tacoing (leaves curing up at the sides like a taco) usually indicates heat/rH issues at the leaf surface.

Star Dog said:

Radiated heat.
Put a thermometer on the canopy?

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I have a hydrometer hanging at canopy height do you mean there is another kind of heat because the meter says that its 73 f and 41 rh

BluntMoniker said:

Yours don't have the tacoing which is the clue its heat/humidity. Nitrogen toxicity is usually seen with burnt tips, dark green leaves, and/or leaf tips curling down.

Tacoing (leaves curing up at the sides like a taco) usually indicates heat/rH issues at the leaf surface.

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Well my heat and humidity are perfect thats why it makes no sense to me and have been giving the exact same nute as my other plants im dumbfounded lol

Tmurrayftw said:

My lights are hanging around 20 inches from canopy none of my other plants are showing any kind of light stress or any other deficiency for that matter its weird ive never had anything like this happen

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It could just be a genetic defect in that particular plant, unless they are all clones. Some are more/less sensitive to heat, nutrients, moisture, etc than others. Even amongst the same strain, you can have variations from seed to seed that could account for this.

Your light itself or the angle it hangs at could also be causing hotspots that HAPPEN to be mostly over that one plant.

Go grab an infrared thermometer from the hardware store for like 20$, and take a leaf surface temp reading if you want to be sure.