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Leaves twisting and curling - any ideas

hyper-piper

New Member
What Strain is it? Jamaican
Is it Indica, Sativa or Hybrid? What percentages? Don't know
How Many Plants? 275
Is it in Vegetative or Flowering Stage? Flowering
If in Vegetative Stage... How Long?
If in Flowering Stage... How Long? 4.5 weeks out of 8
Indoor or Outdoor? Indoor
Soil or Hydro? Soil
If Hydro, Reservoir size?
If Hydro, Reservoir Temperature?
If Hydro, what type of Medium?
If Hydro, what type of Setup?
If Soil... What is in your Mix? ProMix HP + Earthworm + Soil OX + Rare Earth
If Soil... What Size Pot? Beds - 3100 Liters of soil
Size (Wattage) of Light? How Many? 8 1000w HPS Dig Ballasts
Is it Air Cooled? The room - yes 6 tonne a/c
Temperature of Room/Cabinet? 84 day and 74 night
RH of Room/Cabinet? 40 - 60%
PH of Medium or Reservoir? 6.7
Any Pests? Minor Mites here and there
How Often are you Watering? 50 Gallon / 2 days
Type and Strength of Fertilizers used? GH + Aussie + Massive + Carbo
Size or Square Footage of Room? 400 sq ft

Question:

Never known the cause of this leave twisting and curling. Some talk about leaves that claw which points to a Mg Def. My soil is abundant with Mg as I have had it professionally tested (1100 ppm Mg), and with a PH of 6.7 Mg should be available.

But as all shows around week 4.5 to 6 the leaves start to twist and curl, and the outer most tips start to burn which gets progressively worse through week 6 to 8 where they almost completely burn. This strange problem has seriously affected the final weeks dropping an average 2+ lbs/light to an embarrassing 1.2 per.

Anyone seen this type of twisting / curling before?

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Thanks so much everyone...
 
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