Serrated leaf edges curling inward -- Heat?

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SweetSkunk

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All four of my Dutch Passion Auto Glueberry OG plants are suffering with this probelm.

They are coming to the end of their second week.
  • Coco
  • 15L pots (4 Gal)
  • 600w HPS
  • Temps:
    • Max has been 27.5C (81.5F)
    • Average is 25C (77F)
    • I have run autos between 28C and 30C before (82F - 86F)
  • Humidity
    • Average 50% RH; could be higher but it's too difficult to maintain in my setup early doors and have always grown like this
Im not sure what else this could be, other than heat stress, but I don't feel my temps are that high.

any ideas?

Edit: I watched a time lapse of this strain on Dutch Passion's website. Their temps were averaging 25C

IMG20210312153843.jpgIMG20210312153850.jpgIMG20210312153857.jpgIMG20210312153905.jpgIMG20210312153914.jpgIMG20210312153926.jpgIMG20210312153936.jpg
 

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Leaves transpiring more moisture than the roots can supply, so leaves begin dehydrating around the edges. Up the rH, drop the temps, or both. A humidity dome would help if you can find one big enough.
If you look at your temps on the chart, 50% has you well outside the optimal range for this stage.Leaf-Vapor-Pressure-Deficit-VPD-2.jpg
 
SweetSkunk said:
Light height should be ok. It is approx 35cm to 40cm (approx 1ft)
Click to expand...
That sounds too close to me. Use the back of your hand and hold it just above the plant. If it is too warm for your hand it is too hot for the plant.
 
Arthur said:
Leaves transpiring more moisture than the roots can supply, so leaves begin dehydrating around the edges. Up the rH, drop the temps, or both. A humidity dome would help if you can find one big enough.
If you look at your temps on the chart, 50% has you well outside the optimal range for this stage.View attachment 1296115
Click to expand...
Mañ'O'Green said:
That sounds too close to me. Use the back of your hand and hold it just above the plant. If it is too warm for your hand it is too hot for the plant.
Click to expand...

Thanks gentlemen. Will get around to sorting RH and moving light today
 
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