Co2 possibly harming plants?

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Blaze23

Well-Known Member
I just started using co2 in my tent and within a few days I could see that there has been some type of damage done to my plant leaves, I don't know if it could be from the co2 or just something else. The tent is significantly more humid, but my thermostat and dehumidifier are both reading 50%. My temps are set at 82. I have my co2 set for 1100 ppm. I have never dealt with this type of issue before. Here is what they look like.
 
a mongo frog

a mongo frog

Well-Known Member
have you researched vapor pressor when growing with co2? very impotant stuff. don't know if this is really your case. hows your air flow in there as in plenty of fans moving air. night cycle rh and air movement super important.
 
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Blaze23

Well-Known Member
No, Ive never researched vapor pressure. I'll do that now. I have 1 fan 16in air king i've been meaning to throw another in there.
 
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Blaze23

Well-Known Member
a mongo frog said:
have you researched vapor pressor when growing with co2? very impotant stuff. don't know if this is really your case. hows your air flow in there as in plenty of fans moving air. night cycle rh and air movement super important.
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I did a quick read. let me see if I understand what I read. Pretty much, if the vapor pressure in the room/tent is too high it will make it harder for the plant to transpire? Therefore vapor pressure has to be taken into consideration when trying to achieve a optimum humidity level?
 
a mongo frog

a mongo frog

Well-Known Member
Blaze23 said:
I did a quick read. let me see if I understand what I read. Pretty much, if the vapor pressure in the room/tent is too high it will make it harder for the plant to transpire? Therefore vapor pressure has to be taken into consideration when trying to achieve a optimum humidity level?
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yes, however i have found that the rh levels most are calling for are way too high. if your rh is what you say in both day and night periods totally make sure your air is moving good. i had to control air in and out side the canopy. and did you introduce co2 late in bloom? what worked real well for me was to introduce co2 at a lower level in the beginning of 12/12. 600 ppm is actually what i start my room at in the start of 12/12. i also never go over 1000 ppm, however that is just from my experience. others pump that shit way up there. thats if this is really your issue. it too me about a year to fully dial in co2 to get the results every one was talking about.
 
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Blaze23

Well-Known Member
a mongo frog said:
yes, however i have found that the rh levels most are calling for are way too high. if your rh is what you say in both day and night periods totally make sure your air is moving good. i had to control air in and out side the canopy. and did you introduce co2 late in bloom? what worked real well for me was to introduce co2 at a lower level in the beginning of 12/12. 600 ppm is actually what i start my room at in the start of 12/12. i also never go over 1000 ppm, however that is just from my experience. others pump that shit way up there. thats if this is really your issue. it too me about a year to fully dial in co2 to get the results every one was talking about.
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I did introduce co2 late into bloom, midway through actually. I started using co2 5 weeks into flowering and I started it at 1100 ppm. My dehumidifier kept my room at 50% day and night. . . . . One thing i forgot to mention was that I had some leaves that were really yellow and very soft, I also noticed that my plants weren't taking up as much water as you would think when using co2 since they are suppose to be working in "overdrive", so it kinda makes sense to me that if the plant isn't able to transpire the leaves would become saturated with water causing them to become soft like that. I am now 2 days away from being 7 weeks in. . . . . Setting my dehumidifier to 30% should help with vapor pressure right?
 
a mongo frog

a mongo frog

Well-Known Member
Blaze23 said:
I did introduce co2 late into bloom, midway through actually. I started using co2 5 weeks into flowering and I started it at 1100 ppm. My dehumidifier kept my room at 50% day and night. . . . . One thing i forgot to mention was that I had some leaves that were really yellow and very soft, I also noticed that my plants weren't taking up as much water as you would think when using co2 since they are suppose to be working in "overdrive", so it kinda makes sense to me that if the plant isn't able to transpire the leaves would become saturated with water causing them to become soft like that. I am now 2 days away from being 7 weeks in. . . . . Setting my dehumidifier to 30% should help with vapor pressure right?
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You nailed it. Fans, fans, fans bro. Floor fans, wall fans, fans blowing straight up moving air you most likely would not even care about because usually we are taught to only control the canopy area not really beyond. co2 bring a whole other level of water around the leaf area. so fans, fans, fans. let those leaves transpire.
 
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Blaze23

Well-Known Member
a mongo frog said:
You nailed it. Fans, fans, fans bro. Floor fans, wall fans, fans blowing straight up moving air you most likely would not even care about because usually we are taught to only control the canopy area not really beyond. co2 bring a whole other level of water around the leaf area. so fans, fans, fans. let those leaves transpire.
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This is mind blowing lol. Thanks for your help. . . . What are your temps and humidity set at while using co2?
 
a mongo frog

a mongo frog

Well-Known Member
Blaze23 said:
This is mind blowing lol. Thanks for your help. . . . What are your temps and humidity set at while using co2?
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I try to keep my temps 81-83 anything higher my exhaust kicks on to clear room (like a safety valve i guess) my dehue is set all the way down to lowest setting 35 i believe. 50-55 I'm happy with, but during night cycles its not uncommon for me to see 60's. i have so many fans going just move air its crazy.
 
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Blaze23

Well-Known Member
Oh ok, thanks. I set my dehumidifier to 35% it should stay there even at night. I have one of those dehumidifiers with a pump so I never have to empty the bucket. . . . .No that isn't the room, I wish I still had that room running. I had to move into a new place so now im using a 10x10 tent with 3 - 1k watt lights in it. I'll be adding another 10 x 10 with the same set up in about 2-3 months.
 
a mongo frog

a mongo frog

Well-Known Member
Blaze23 said:
Oh ok, thanks. I set my dehumidifier to 35% it should stay there even at night. I have one of those dehumidifiers with a pump so I never have to empty the bucket. . . . .No that isn't the room, I wish I still had that room running. I had to move into a new place so now im using a 10x10 tent with 3 - 1k watt lights in it. I'll be adding another 10 x 10 with the same set up in about 2-3 months.
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just real quick i set my dehues to 35 because thats what it takes to keep 50-55%. your room may run different. just want you to check and not think i meant run rh a 35 %
 
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