Carbon dioxide is one of the crucial components in the photosynthesis process and therefore the production. The concentration of carbon dioxide expressed in ppm directly relates to the production. In a greenhouse the concentration of CO2 depends on the ventilation rate, the absorption and release by the crop, release of CO2 from the ground or substrate, and if applied, CO2 enrichment. As a result, the concentration can vary between 100 pm (no ventilation and photosynthetic process working) and 1500ppm (maximum level when co2 enrichment is provided). Outside the average CO2 concentration is
around 400 ppm.
In a closed greenhouse all parameters for cultivation can be controlled including the CO2 concentration. In the greenhouse at Estidamah, it is possible to show the effect of carbon dioxide concentration where the other factors influencing the production are kept the same in the two greenhouse compartments, providing excellent research results.
The closed greenhouse is the most water efficient greenhouse possible. The economic feasibility of this type of greenhouse must be justified though. For this the use of resources must be determined exactly and the resulting production must be recorded. Through this experiment more insight will be provided on this aspect. In this experiment it was determined what the effect and use of carbon dioxide in relation to the production of tomato for two different concentrations for two different varieties
