Please look at my leaves.
- Thread starter Kater
- Start date
Re: Please look at my leaves...
Sometimes cold temperatures can produce purpling of leaf edges and tips. How cold is it getting in your grow space?
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Sometimes cold temperatures can produce purpling of leaf edges and tips. How cold is it getting in your grow space?
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Screwnuts33
Member of the Month 3rd Place Winner (Dec 09')
Re: Please look at my leaves...
What are you using for light and nutes? It appears that you lights are bleaching the leaves. Or possibly a nitrogen defiency.
What are you using for light and nutes? It appears that you lights are bleaching the leaves. Or possibly a nitrogen defiency.
- Thread starter
- #4
Re: Please look at my leaves...
That's a little on the cold side.
Are you running your lights at night?
That's a little on the cold side.
Are you running your lights at night?
Re: Please look at my leaves...
Almost looks like a Molybdenum deficiency.....saw this picture in 420 Plant and pest problems pictorial
Almost looks like a Molybdenum deficiency.....saw this picture in 420 Plant and pest problems pictorial
Dr FrankenKush
New Member
Re: Please look at my leaves...
I noticed you said that you were still using pro grow 3 weeks into flowering? If so switch to BLOOM formula, catch it up with light light foliar feeding...Just the bloom 1/3 dosage. Give it couple of days..
I noticed you said that you were still using pro grow 3 weeks into flowering? If so switch to BLOOM formula, catch it up with light light foliar feeding...Just the bloom 1/3 dosage. Give it couple of days..
Zodiakgrower7
New Member
Re: Please look at my leaves...
It is getting down to about 58 degrees when the lights are out and up to 70 when the lights are on.
That is toooo cold, it shouldn't drop below 65 with the lights off and with the lights on you should be between 72-78 degrees. I would also say it's due to the cold, hope you have a way to warm it up in there.
- Thread starter
- #9
Re: Please look at my leaves...
SOme minerals become less mobile at colder temps. The heater should help. Just dont put it too close to your plants.
Its a bit dry but the last line is most important:
Abstract
Molybdenum (Mo) deficiency caused killing of winter wheat seedlings during winter season in southern China has become a problem limiting wheat yield. The effects of low temperature (-5°C-0°C) on Mo deficiency of winter wheat seedlings (Triticum aestivum L. var. “Lumai22”) were investigated in a pot experiment with an acid soil. After induction by low temperature, symptoms of Mo deficiency appeared quickly in whole plants of no Mo (-Mo) treatment, especially in lower leaves. Molybdenum deficiency increased the rate of K+ leakage at 9 h and 24 h after cold treatment in lower and upper leaves respectively. Nitrate reductase activity decreased with - Mo treatment under low temperature conditions, free amino acid content decreased corresponding to it. Total soluble sugar and sucrose contents in functional and primary leaves were raised in - Mo treatment as a whole. After low temperature treatment, total soluble sugar and sucrose content in functional leaves of Mo deficient plants dropped, while those in primary leaves increased, indicating sugar transported from old leaves to primary leaves where sugar is not enough. Mo deficiency had less influence on superoxide dismutase, and catalase activity, however peroxidase activity raised by - Mo treatment under low temperature. It is concluded that Mo deficiency has a close relationship with low temperature induction.
SOme minerals become less mobile at colder temps. The heater should help. Just dont put it too close to your plants.
Its a bit dry but the last line is most important:
Abstract
Molybdenum (Mo) deficiency caused killing of winter wheat seedlings during winter season in southern China has become a problem limiting wheat yield. The effects of low temperature (-5°C-0°C) on Mo deficiency of winter wheat seedlings (Triticum aestivum L. var. “Lumai22”) were investigated in a pot experiment with an acid soil. After induction by low temperature, symptoms of Mo deficiency appeared quickly in whole plants of no Mo (-Mo) treatment, especially in lower leaves. Molybdenum deficiency increased the rate of K+ leakage at 9 h and 24 h after cold treatment in lower and upper leaves respectively. Nitrate reductase activity decreased with - Mo treatment under low temperature conditions, free amino acid content decreased corresponding to it. Total soluble sugar and sucrose contents in functional and primary leaves were raised in - Mo treatment as a whole. After low temperature treatment, total soluble sugar and sucrose content in functional leaves of Mo deficient plants dropped, while those in primary leaves increased, indicating sugar transported from old leaves to primary leaves where sugar is not enough. Mo deficiency had less influence on superoxide dismutase, and catalase activity, however peroxidase activity raised by - Mo treatment under low temperature. It is concluded that Mo deficiency has a close relationship with low temperature induction.
Re: Please look at my leaves...
Are you running your lights at night, when ambient temps are the coldest?
If you aren't, you might be able to avoid getting a heater by doing so.
Are you running your lights at night, when ambient temps are the coldest?
If you aren't, you might be able to avoid getting a heater by doing so.
- Thread starter
- #12
Re: Please look at my leaves...
I do run the lights at night. The intake and out-take fans run 24/7. I was thinking that maybe I should turn them off for a few hours during the day when the lights are out and it gets the coolest in the room. Any reason to not turn the fans off for a few hours when the lights are out?
I do run the lights at night. The intake and out-take fans run 24/7. I was thinking that maybe I should turn them off for a few hours during the day when the lights are out and it gets the coolest in the room. Any reason to not turn the fans off for a few hours when the lights are out?
Dr FrankenKush
New Member
Watch for higher humidity and any problems if any that may happen other than that it should be OK, maybe leave a small fan to circulate air slightly...
- Thread starter
- #14
Thank you. I am going to give it a try....
Plants need fresh air in the dark also, so turning all the ventilation off is probably not good.
Instead of a heater, which is going to use around 1500w of energy, you could raise the temp by using a large seedling heat mat.
There is a 20" X 20" that uses 40w or so, and it will keep the roots warm when the lights are off. If you keep the roots warm, the rest of the plant can tolerate the cold much better.
I have exactly the same issue you do during the winter months, and a large heat mat solved it for me without using a 1200-1500w heater.
Plus, you can use it under clones and seedlings when it's not doing heater duty.
Instead of a heater, which is going to use around 1500w of energy, you could raise the temp by using a large seedling heat mat.
There is a 20" X 20" that uses 40w or so, and it will keep the roots warm when the lights are off. If you keep the roots warm, the rest of the plant can tolerate the cold much better.
I have exactly the same issue you do during the winter months, and a large heat mat solved it for me without using a 1200-1500w heater.
Plus, you can use it under clones and seedlings when it's not doing heater duty.
- Thread starter
- #17
What a great idea!
- Thread starter
- #18
