The figures in the table below should be viewed as rule of thumb only. They are based on tomato plants' responses to changes in the environment. If you grow in a greenhouse and depend on natural light, we have another chart available.
NOTES: - Do not inject CO² at night.
- No light, no water !
- During the night, when you do not have your grow light on, the humidity will naturally go up a bit, as the air cools. There no reason to worry about that. During the night just maintain the 70º room temperature and the slab water content.
- When you grow in a closed room, CO2 will, because of the plants, be around 300 ppm. Therefore, for vegetative growth there should be little or no CO2 injection.
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