Why a plant can absorb CO2 through its drinking roots is a very up-to-date question. Measure your medium in the dark hours and you will find CO2 put off by the plant after the photosynthesis has stopped. Measure again when the lights are on for half an hour and you will see that the CO2 has disappeared. Healthy plants with a good conductivity can take up extra CO2 and convert it into growing materials. For the experienced growers there will be a laboratory report here online in the near future to justify this thesis in a scientific way. (done in the mean time)
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