anferneybra
Member
Hey everyone.
I have seen this topic discussed some on this forum and I was reading Spurr's post about CO2 and really couldn't come to a definite conclusion so I thought I would start a small discussion about it.
Here is my issue:
Vegged for 3-4 weeks in my sealed room at 74 degrees, 50% RH, 12 K metal halide adjusta-wings. 3 gallon pots, all plants perfect, not one deficiency, stress sign or unhappy girl in the bunch of 90. CO2 was not supplemented in veg, so ambient was 400-500 constant with the monitor.
This past week we transplanted into 10 gallon containers. About a pallet of fresh soil was put in the room. Inoculated with a strong tea and off to the races! I started supplementing with CO2 to about 900 ppms. They seemed to take the transplant pretty well. Today, about a week later, I notice some heavy drooping in about 10-15 of the plants. Check for watering, not dry at all. Seem to not have eaten since the last watering. Check my nighttime CO2, keep in mind I only supplement to 900, and ppms are 1300-1400...
I shut off the CO2 today. They are lights on back down to their 400 range. I hope this corrects the problem, or what I think the problem is.
CO2 toxicity, basically drowning the plants roots at night time. I have read up on soil respiration and plant gas exchange. Plants give off CO2 at night, and soil constantly gives off CO2, especially soil dominated by healthy bacteria. Bacteria produce CO2 as a by product.
So I ask, are CO2 levels above 500ppm, hindering my plants from thriving and ultimately dying? Should I dump the room when lights go off? 1 time? full time? Any input is appreciated.
PS: The room down the hall has a huge undercurrent system in it. Same type of issue with high CO2 at dark time but the plants are fine. Only reason I can think of is because they have a air stone supplementing air to the roots 24/7...
I have seen this topic discussed some on this forum and I was reading Spurr's post about CO2 and really couldn't come to a definite conclusion so I thought I would start a small discussion about it.
Here is my issue:
Vegged for 3-4 weeks in my sealed room at 74 degrees, 50% RH, 12 K metal halide adjusta-wings. 3 gallon pots, all plants perfect, not one deficiency, stress sign or unhappy girl in the bunch of 90. CO2 was not supplemented in veg, so ambient was 400-500 constant with the monitor.
This past week we transplanted into 10 gallon containers. About a pallet of fresh soil was put in the room. Inoculated with a strong tea and off to the races! I started supplementing with CO2 to about 900 ppms. They seemed to take the transplant pretty well. Today, about a week later, I notice some heavy drooping in about 10-15 of the plants. Check for watering, not dry at all. Seem to not have eaten since the last watering. Check my nighttime CO2, keep in mind I only supplement to 900, and ppms are 1300-1400...
I shut off the CO2 today. They are lights on back down to their 400 range. I hope this corrects the problem, or what I think the problem is.
CO2 toxicity, basically drowning the plants roots at night time. I have read up on soil respiration and plant gas exchange. Plants give off CO2 at night, and soil constantly gives off CO2, especially soil dominated by healthy bacteria. Bacteria produce CO2 as a by product.
So I ask, are CO2 levels above 500ppm, hindering my plants from thriving and ultimately dying? Should I dump the room when lights go off? 1 time? full time? Any input is appreciated.
PS: The room down the hall has a huge undercurrent system in it. Same type of issue with high CO2 at dark time but the plants are fine. Only reason I can think of is because they have a air stone supplementing air to the roots 24/7...