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Learn about CO2 in your grow rooms: Learn more: https://www.htgsupply.com/information... From Maximum Yield: Plants need 17 essential elements to grow and reproduce. But just three elements—carbon, hydrogen and oxygen—account for more than 95% of a plant’s dry weight. If you want to dramatically increase yields in an enclosed growroom, providing your plants with extra CO2 (carbon dioxide) is an excellent investment. In indoor gardens, light is usually the limiting factor for optimal plant growth. Once light is no longer the limiting factor, carbon dioxide becomes the limiting factor, so make sure your plants are getting all the fresh air and carbon dioxide they need. Fresh air contains carbon dioxide at about 370 ppm, so providing adequate ventilation and air movement is a good first step. Unfortunately, in a tightly enclosed greenhouse or growroom, ambient CO2 can get used up quickly. For example, in a plastic greenhouse, CO2 levels can be reduced to less than 200 ppm just 1-2 hours after sunrise. At levels below 200 ppm, plant growth will be greatly limited, and at levels below 100 ppm, plants will stop growing altogether. On the other hand, carbon dioxide levels above ambient levels can have a dramatically positive effect on plant growth. By increasing carbon dioxide levels to 750-1,500 ppm, growers can expect a 30-50% increase in yields over ambient CO2 levels, and time to fruiting and flowering can be reduced by 7-10 days. Just as excessive levels of fertilizer salts can harm plants, excessive levels of CO2 enrichment can have adverse effects. In a growroom, levels above 1,500 ppm are considered wasteful, and levels above 5,000 ppm are harmful. Excessive levels will cause the stomata on plant leaves to close, temporarily stopping photosynthesis. And since plants will no longer be able to transpire water vapor adequately when the stomata are closed, leaves can become scorched.