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Old 05-25-2008, 06:40 AM
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Default Temps and CO2
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Ok, so we know that with higher temps, CO2 can offset that.

When is the temp just too high, even for CO2?

I can get has high as 87 (give or take a few) And can keep my CO2 between 775ppm and 1500ppm (I give a shot until it hits the 1500ppm and let it work down to 775ppm before its starts over)


Is there a guideline of temp/CO2 levels?

-bbb
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Old 05-25-2008, 07:54 AM
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1500 extra or something I thought, it can go to 2200??
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Old 05-25-2008, 01:35 PM
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1500 extra or something I thought, it can go to 2200??
LOL Talk about a non answer.

1500 extra? 1500 is ideal. wouldn't that be 3000? Where did the 2200 come from?

What temp?

I maybe a newbie, but *very* tech savvy.
I'm looking for he sliding scale of temp vs ppm.

-bbb
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Old 05-26-2008, 01:15 PM
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nothing? anybody?
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Old 05-26-2008, 01:55 PM
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i always heard 80 without and 90 with. sorry i dont have any more specifics on the co2 levels or range guides.
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Old 05-26-2008, 02:03 PM
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nothing? anybody?
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Proper temperature is one highly variable factor. Most books state optimum grow temperature to be 70-80 degrees, but many list extenuating circumstances that allow temperatures to go higher. Assuming genetics is not a factor, marijuana plants seem to be able to absorb more light at higher temps, perhaps up to 90 degrees. High light and CO2 levels could make this go as high as 95 degrees for increased marijuana growth speed.* An optimum of 95 degrees is new data that assumes very-high light, CO2 enrichment of 1500 ppm and good regular venting to keep humidity down. It is not clear if these temperature will reduce potency in flowers. It may be a good idea to reduce temperatures once flowering has started, to preserve potency, even if it does reduce growth speed. But higher temperatures will make plants grow vegetatively much faster, by exciting the plants metabolism, assuming the required levels of CO2 and light are available, and humidity is not allowed to get too high.
With normal levels of CO2, in a well vented space, 90 degrees would seem to be the absolute max, while 85 may be closer to optimum, even with a great deal of light available. Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth.
Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way. Mid 50’s will cause mild shock and 40’s will kill your plants with repeated exposure. Keep your plants warm, especially the roots. Elevate pots if you think the ground is sucking the heat out of the roots. This is an issue if you have a slab or other type of cold floor.
As temperature goes up, so does the ability of the air to hold water, thus reducing humidity, so a higher average temperature should reduce risk of fungus.
Contrary to many reports, high humidity is not good for plants except during germination and rooting. Lower humidity levels help the plant transpire CO2 and reduce risk of molds during flowering.
Studies indicate the potency of buds goes down as the temperature goes up, so it is important to see that the plants do not get too hot during flowering cycles. ? D. Gold: CO2, Temperature and Humidity, 1991 Edited by E. Rosenthal.
From here TEMPERATURE for marijuana growth and marijuana flowers
 

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