I have been doing this for a long time now and this is about the only problem I ever have and have never been able to figure out what the issue is and what would be causing it. Wondering if someone with good knowledge could help me out and tell me what the hell this is.
Problem ? with pics.
- Thread starter bran1981
- Start date
Humidity is at about 37, daytime temps at 79 and night time temps are 66. I use botanicare pro nutes with ro water along with the recomended dose of calmag witch is 5ml per gal. I am about 4 weeks in to flower and keeping ph between 5.8 and 6.0 and ec between 1.8 and 2.0 this is on flood tables.
BeefSupreme
Active Member
what is your circulation like?
I guess your talking about air circulation in the intire room? I have 1 big furnice fan attached to two 125 can filters in order to clear the air in the room and two of the really small can filters attached to the lights so that there is no smell getting out from venting the lights. With that running it pulls enough air through the intire room to make the plants shake just a hair, so there should be plenty of fresh air. It couldn't be a heat issue nither. I can accually grab ahold of any of my hoods for the lights and they are almost as if there not even on there so cool.
Wondering if I have been adding to much calmag. I have been going by what the lable says witch is 5 ml. per gal. but I have read in a few other post about the calmag and it was recomended to use it at half strength. Does the issue look like it could be from over dosing with the calmag?
Earl
Well-Known Member
You only need about 50-100ppm calmag+
That works out to about 1-2ml/gl of botanicare CM+
others brands might differ.
I believe your leaf indicate heat stress.
When the stomata on the underside of the leaf close,
that will cause the leaf to curl.
I run my room in the 6oºs
to keep the canopy temp in parameter.
If your leaves flatten out after you lower the temp,
then you'll know it is the light/heat causing the problem.
Closed stomata will inhibit transpiration and slow growth,
but you are not trying to grow leaf anyway,
and the buds should continue to grow.
That works out to about 1-2ml/gl of botanicare CM+
others brands might differ.
I believe your leaf indicate heat stress.
When the stomata on the underside of the leaf close,
that will cause the leaf to curl.
I run my room in the 6oºs
to keep the canopy temp in parameter.
If your leaves flatten out after you lower the temp,
then you'll know it is the light/heat causing the problem.
Closed stomata will inhibit transpiration and slow growth,
but you are not trying to grow leaf anyway,
and the buds should continue to grow.
Okon the calmag, I have been adding the 5ml. like the bottle says and it brings the ppm too about 300 so I think that's the problem. I don't know how it would be heat, I have my lights about 2 feet from the plants and it is only about 79 degress at the top of the plants. I can't even feel a wormth on my hand when I hold it at the top of a plant.
Earl
Well-Known Member
I believe the stomata close about 75º
If you really want to know the canopy temp,
you need a laser thermometer.
I bet the leaves under the curled ones are flat,
because they are cooler.
I just use enough calmag to supplement the plant,
any more and you will have pH problems.
50-100 tds cm+
with 70 ppm being about perfect
usually will meet the plants needs
and buffer the solution.
Too much CM+ and the pH will rise
and you will fight it
until it is time to change out.
If you really want to know the canopy temp,
you need a laser thermometer.
I bet the leaves under the curled ones are flat,
because they are cooler.
I just use enough calmag to supplement the plant,
any more and you will have pH problems.
50-100 tds cm+
with 70 ppm being about perfect
usually will meet the plants needs
and buffer the solution.
Too much CM+ and the pH will rise
and you will fight it
until it is time to change out.