ON-LINE CONTROL OF CO2 ENRICHMENT IN PROTECTED CULTIVATION
Preliminary experiments with lettuce were performed with CO2 supply depending on wind velocity and irradiance. Additionally, intermittent CO2 application was tested. Results indicate that the efficiency of CO2 enrichment varies relying on season and year. If planted in October cutting off CO2 supply led to extended growth periods with increased energy demands. If planted in January no significant differences in growing periods occurred between constant CO2 treatments, intermittent CO2 supply and cutting off due to wind velocity and irradiance, except differences to the control. Simulations for optimizing CO2 on-line control are in progress.