I run it all the way to chop with no problems. I wouldn't swear to the benefit though. In my opinion CO2 might be the least understood component of an indoor grow. The finer details of it anyway. Maybe somebody smart will post some scientifics?Hi : ) So the question is:
Do you stop using CO2 two weeks before harvesting?
I know some people are! Do you guys know if it's better and why?
Thanks for your time!
I was hoping somebody smart might chime in for my benefit as well. Maybe a fresh post will get more looks.
Thinking about it a little more, I did remember a couple things.
There are sealed rooms and then there are SEALED rooms, if you're anywhere close to airtight it could be a problem to shut it off. Just like we will use up all the oxygen in a sealed room and suffocate, the same could be an issue for plants.
Another thing from my own experience that I have settled in on is 1000ppm. I have read enough people posting that they see little to no benefit from CO2 that I figure at 1000, I'm still double what I would be without it. You also have 1/3 less heat created by burners with 1/3 less LP or NG usage than 1500ppm. Or 1/3 less trips if using tanks.
Does anybody have some CO2 knowledge/experience to share?
Plants are not really using CO2 or any nutrient in large amounts the last few weeks of flower because they are in the process of dying. I don't think you will find any difference however if you do run it all the way through. If you have a sealed room, you will be able to tell that it isn't needed because your ppm's will not decrease very much.
If you wanted to see the amount the plant is using, I would drop the CO2 down to 800 or 1000ppm and then close the tank and see how long it takes to get down to ambient (around 400ppm indoors) If you are using soil, chances are the microbes are helping you out as well and producing a healthy amount of CO2 from the soil, so the chances of exhausting all of it is unlikely IMO.
Awesome, I read most of the topics but have trouble scrolling down that page. Thank youI actually have a pretty informative article on my site under advanced growing about all of this. The temperature thing is a myth actually although under elevated CO2 the plant can take a bit more heat than would otherwise be tolerable.
1. In what parts of the life cycle is enrichment of most and least value?
At all parts but at some point cost of CO2 has to be considered so many growers only elevate CO2 during flower. Also because elevated CO2 makes the plant grow more quickly a lot of growers don't like to elevate CO2 during stretch.
3. Is there any benefit to adjusting ppm at certain points?
As a general rule because photosynthesis and carbon petitioning is increased in elevated CO2 it is wise to increase ppm to accommodate for this. In fact, research has shown that particularly N and P demand is increased. The easy fix though without getting too technical is increase ppm (BTW I don't like ppm as a measurement because there is no universal standard so I like to talk in EC).
I'd read the article I posted to get a better idea. CO2 enrichment isn't for everybody and far too many get it wrong.
My plants always use the most CO2 during the first three weeks of flower by several hundred ppm per hour.
Without getting too technical though Ill try to think through my screaming children.
The first limiting factor is light. No light=No photosynthesis. Light creates light dependent reactions within the plant. The more photons the more ATP and NADPH is produced. These light reactions will eventually plateau and become limited by the next factor which is CO2. The Carbon in CO2 will produce the carbohydrates within the plant until this too plateaus. Temperature does not effect the light dependent reactions from photons but it does effect the light independent reactions. These reactions are made by enzymes in the plant that have an optimum temperature to do so depending on the species. It is hard to pinpoint for sure but anywhere between 77-85 seems to me to be optimum. Once the temp goes beyond this point, it begins to effect it negatively. Get all three on point and you can't do much more.
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Awesome, I read most of the topics but have trouble scrolling down that page. Thank you
Check this out Happymonkey
Temperature is absolutely critical in the light dependent reactions because temperature affects the ability of rubisco to catalyse CO2. In fact the most important factor in this process is by far temperature.
The issue could be on my end but when I cursor over the Grow Info and the topics display, I cant mouse over to the scroll without the display retracting. Sorry, my computer terminology is as bad as my horticulture terminology.Is there an issue with the scroll? If so I will need to look at that. Cheers for the heads up
Speaking of CO2 in the first three weeks, Glow's site mentions that some people will skip elevating the CO2 at the first part of flower as not to encourage stretch. A really interesting strategy I never would have thought of.My plants always use the most CO2 during the first three weeks of flower by several hundred ppm per hour.
Without getting too technical though Ill try to think through my screaming children.
The first limiting factor is light. No light=No photosynthesis. Light creates light dependent reactions within the plant. The more photons the more ATP and NADPH is produced. These light reactions will eventually plateau and become limited by the next factor which is CO2. The Carbon in CO2 will produce the carbohydrates within the plant until this too plateaus. Temperature does not effect the light dependent reactions from photons but it does effect the light independent reactions. These reactions are made by enzymes in the plant that have an optimum temperature to do so depending on the species. It is hard to pinpoint for sure but anywhere between 77-85 seems to me to be optimum. Once the temp goes beyond this point, it begins to effect it negatively. Get all three on point and you can't do much more.
View attachment 852759
I really don't come around here to argue with anyone or measure anything against anothers but I wish you well on your website. I didn't get a chance to check it out but I'm sure its great.
The issue could be on my end but when I cursor over the Grow Info and the topics display, I cant mouse over to the scroll without the display retracting. Sorry, my computer terminology is as bad as my horticulture terminology.
Speaking of CO2 in the first three weeks, Glow's site mentions that some people will skip elevating the CO2 at the first part of flower as not to encourage stretch. A really interesting strategy I never would have thought of.
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