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=== Supplimenting additional CO<sub>2</sub> ===
In a city typical Co<sub>2</sub> levels are around 400-450ppm. This is acceptable for a growing plant but raising levels above 1000ppm can increase growth rates by up to 30%<ref>B. A. Kimball, 1983, Carbon Dioxide and Agricultural Yield: An Assemblage and Analysis of 430 Prior Observations - https://doi.org/10.2134/agronj1983.00021962007500050014x</ref> <ref>Hendrik Poorter, 1993, Interspecific Variation in the Growth-Response of Plants to An Elevated Ambient CO2 Concentration - http://dx.doi.org/10.1007/BF00048146</ref> when combined with sufficient light intensity by enabling higher rates of photosynthesis. For more on the limitation of low Co<sub>2</sub> at high levels of light intensity see: [[Light#Upper limit of light intensity|Upper limit of light intensity.]]
For more on how co<sub>2</sub> is applied in a grow setting see: [[Growing environments#Adding extra Co2|Adding extra Co<sub>2.</sub>]]
== Transpiration ==
The cultivar constantly moves water around internally via capillary action and releases water vapor into the environment through the stomata, this is the process of transpiration. The
The rate of transpiration also affects the rate of water uptake through roots, this is because 97% of water Cannabis absorbs is lost via transpiration (this is a typical characteristic of a C3 plant). A higher water intake means that [[nutrients]] can be delivered more quickly.
==Circadian rhythm==
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