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Rockwool 5
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"Chapter 5: Light
5.1. Preface
Almost all living beings are dependent on light of satisfactory quality.
For humans, that means that sufficient oxygen must be present in the air,
and that the air is not too polluted. For plants, and thus also for cannabis,
it means good air quality, enough carbon dioxide (CO2), and not to much
pollution. Relative humidity (RH), and temperature also play a large role
in the growth of plants.
5.2. Influencing air quality
The amount of CO2 in the open air is appoximately 0.03 to 0,04%. The amount
of carbon dioxide is also expressed in parts per million; ppm. 0.03% is
equal to 300 ppm. There are differences in the CO2 needs among plants.
By raising the CO2 content, growth can be accelerated. The law of diminished
returns still holds true, however. Raising the CO2 level has limits, but
at approximately 1400 ppm (0.14%), good results (a faster growth) are generally
achieved. Above 1400 ppm, the effect of a higher percentage of CO2 decreases.
A high concentration of CO2 is poisonous even for plants. A CO2 concentration
of 1800 ppm or more is deadly for most plants. A simple method for guaranteeing
the supply of carbon dioxide is to ventilate the room. Sufficient ventilation
must be provided, so the plants keep getting enough fresh CO2. A second
and just as important reason for venti"
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