Leaves Curling Upward

[Died_Evil]

[FONT='Verdana','sans-serif'][FONT='Verdana','sans-serif']Hi everyone, My leaves are starting to curl upwards and it has me a little concerned. If anybody has any knowledge about this situation, it would great be appreciated![/FONT]
[/FONT][FONT='Verdana','sans-serif']My information:[/FONT]
[FONT='Verdana','sans-serif']1. How tall are your plants now? 6 inches tall

2. How far from the lights are the tops of your plants? Is this a constant distance or have you changed it recently? 12 inches

3. How old are they? 10 days

4. What strain are they? Nirvana Bubblelicious

5. Did you start them from seed or clone? Seed

6. What type of containers are you using and what size are they in gallons? 50 litter Hydroton tray with 4 plants


WHAT TYPE OF GROW DO YOU HAVE?


7. Dirt? No

8. What mixture of dirt or type of dirt did you use? Hydroton Medium

9. Is it a type that has added nutrients like "Miracle Grow"? GH 3 part Micro Gro Bloom

10. What mixture of perlite, vermiculite and other additives have you used if any? None

11. Hydroponic? Ebb and Flow


WHAT TYPE OF HYDROPONIC SYSTEM DO YOU USE?


12. Ebb and Flow Yes

13. NFT No

14. Bubbler/Deep Water No


WHAT TYPE OF MEDIA DO YOU USE?


15. Gravel No

16. Hydroton Yes

17. Rockwool slab No


WHAT TYPE OF LIGHTS DO YOU USE?


18. Fluorescent No

19. Halide No

20. HPS Yes

21. Wattage? 250 watt

22. Ballast, is it digital or analog? Analog

23. Is it remote or in your grow area? Yes

24. What nutrients are you feeding your plants? GH 3 part system Micro Gro Bloom


HYDROPONIC FERTS?


25. What brand? What mix? What strength? GH 3 part Micro Gro Bloom 50% strength

26. How often, and when was the last time? Every week, 9/27/09


SOIL FERTS?


27. What brand? What strength? What mix? No

28. How often, and when was the last time? No


ENVIRONMENTAL CONDITIONS OF THE GROW AREA


29. Do you use ventilation for your indoor grow? Yes

30. If so, what do you use? 150CFM bathroom exhaust fan

31. Do you use a fan? Isolating fan

32. What type of fan and where is it pointed? What speed? Exhaust is on top direct to outdoors

33. Temperature of the grow area? 75ºF at night 83ºF on light cycle

34. Humidity of the grow area? 40% to 60%

35. Is CO2 being introduced? What method? No

36. Do you use Odor Control, (carbon, ionizer, ozone gen)? Ozone

37. Do you use LST? HST? Low Stress Training[/FONT]
[FONT='Verdana','sans-serif']How long has this problem been going on? 3 days

Are you growing in a PVC grow tent? Yes Non-Toxic 2’x4’x5’

How long have they been in there mixture they are in now?(coco,soiless etc..) since seed

What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Veg

What Technique are you using? Scrog

What is the Water temperature? 73ºF

What color are your roots? White? Brown? Are your roots slimy? White

What order are you mixing your nutrients? Micro-Gro-Bloom[/FONT]
[FONT='Verdana','sans-serif']
What is the TDS/EC/PPM you are using? 390 ppm

What is the pH of the "Tank"? 5.61 pH

Are you sure your calibration is correct on your equiptment? Calibrated Daily

When was your last watering? 11:00am 9/28/09

How often do you clean your system: example: Flush out water replace with clean water and nutrients? Every Week

Is the fan blowing directly at plants? Yes

What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Reverse Osmosis 0ppm

Has plant been recently pruned, cloned off of or pinched No

Have any pest chemicals been used? If so, What and When? No

Are plant's infected with pest's No[/FONT]

 

[Growdude]

That looks like heat stress, are you measuring the temps at the canopy?

 

[Died_Evil]

That looks like heat stress, are you measuring the temps at the canopy?

Hey Growdude

Yep the temperature is measure directly at canopy level...maintaining temp around 81-85 degrees

 

[Died_Evil]

For anyone wondering...it was over fertilization
The leaves curling upward are the first signs of over fertilization but then it will develop yellowing spots at the edges of the left tips.
A quick flush and reset the nutrients to half strength cured the problem.