Curling leaves - why ?

N

nick33149

Member
Very young leaves have started to curl up as in the photo, during the last week.Plants are 9 weeks from clones, 4 wks on 12/12, 18" away from 400 watt HID, nutrient 10 days old, strength as recommended by general hydroponics online calculator,pH 6.1, 1602 ppm , 4 x 10 min floods daily, Room temp 92 degrees in day, humidity 60-75 %, room v. well ventilated. Fan blows over lights , leaves rustle.
There have recently been a few of the usual 5 min summer
power cuts . I just changed the nutrient to half strength to
see if that helps. Any ideas as to the cause ? Nitrogen excess? Thanks
( photo won't attach- not permitted?)
 
Green Cross

Green Cross

Well-Known Member
nick33149 said:
Very young leaves have started to curl up as in the photo, during the last week.Plants are 9 weeks from clones, 4 wks on 12/12, 18" away from 400 watt HID, nutrient 10 days old, strength as recommended by general hydroponics online calculator,pH 6.1, 1602 ppm , 4 x 10 min floods daily, Room temp 92 degrees in day, humidity 60-75 %, room v. well ventilated. Fan blows over lights , leaves rustle.
There have recently been a few of the usual 5 min summer
power cuts . I just changed the nutrient to half strength to
see if that helps. Any ideas as to the cause ? Nitrogen excess? Thanks
( photo won't attach- not permitted?)
Click to expand...
Can you attach a thumbnail? Try the paperclip button on top.
 
N

nick33149

Member
Negative - ' insert image' ( mountain icon) and paper clip
are both non functional. I am coming in via a proxy-problem ?
Cheers
 
rukemonna

rukemonna

Member
That looks just like the flowers of a rejuvenating mom after increasing the light cycle and her back in the initial juvenile growth stage
 
N

nick33149

Member
These curling leaves are different from all the ones I have seen on lots of threads all over the world on 'curling leaves' .These, only the very small young leaves under the flowers are affected. Rukemonna, yes it could be that the power cuts have caused a veg? or flower? - confusion, or its the high heat. Excessive nutrition I think affects/shows on older leaves. but just to try something, they're on 50% nutes now and being sprayed with water every few hours in the middle of the day. Root problem? cant think why-see the specs. Pics?sorry don't have more- they all look the same. Thanks to all !
 
rukemonna

rukemonna

Member
"These curling leaves are different from all the ones I have seen on lots of threads all over the world on 'curling leaves' .These, only the very small young leaves under the flowers are affected. Rukemonna, yes it could be that the power cuts have caused a veg? or flower? - confusion, or its the high heat. Excessive nutrition I think affects/shows on older leaves. but just to try something, they're on 50% nutes now and being sprayed with water every few hours in the middle of the day. Root problem? cant think why-see the specs. Pics?sorry don't have more- they all look the same. Thanks to all !"
 
N

nick33149

Member
Grow room temp is mid 90's in day . Ok - I'll watch the water spraying but its so darn hot that the water is gone in a few minutes with the big fan blowing over them. Will watch for a few days and let you know if better or worse. These are two scrogs in same room- 400W is worse than 175 W so it could be heat.
 
Cashola

Cashola

Member
Seems very humid in there @65%. Why are you spraying flowers? Attached is a pic of a rejuvenating mother. Remember, she's been on a N diet while in flowering.
 

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