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Green House Carbon Dioxide Enhancement Supplementary Co2 Generation
   
The introduction of supplementary carbon dioxide into the greenhouse has been found to significantly increase the yields of greenhouse tomatoes and other vegetables. Supplementary carbon dioxide is most effective on days when the greenhouse has been shut up for several days with no ventilation. Maximum results can be achieved by injecting 1000-1500 ppm CO2 into the greenhouse using propane burners or other CO2 generators.
If ventilation is minimized and greenhouses are sealed tightly to prevent heat loss and to conserve energy, the end result can be depletion of carbon dioxide levels within the greenhouse. Plants need carbon dioxide for photosynthesis and its depletion can stunt plant growth. Like carbon dioxide, other environmental variables including water and light, need to be within acceptable ranges for photosynthesis to occur.
Either temperature, light or carbon dioxide can limit photosynthesis if they are not at the right level. Because of the high costs of heating greenhouses, energy-conscience growers have sealed greenhouses to reduce warm air leaks. This practice, while good from the energy savings point of view, can have negative consequences for plant growth. Plants that are well watered and fertilized can take advantage of the light and photosynthesize in tightly closed greenhouses.
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By doing so, the plants remove carbon dioxide from the air. Since the greenhouses are closed, carbon dioxide removed by the plants cannot be replaced by outside carbon dioxide. The result is carbon dioxide depletion and a lower photosynthetic rate. When the carbon dioxide level drops below 200 parts per million, photosynthesis stops and the plants stop growing. In this situation, energy is wasted keeping the plants warm while they are not growing.
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