ON-LINE CONTROL OF CO₂ ENRICHMENT IN PROTECTED CULTIVATION

As a base for experiments on CO₂ on-line control the CO₂ fluxes in greenhouses are simulated and potential control strategies presented.
Some approaches are tested, others outlined for discussion.

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.

International Symposium on Models for Plant Growth, Environmental Control and Farm Management in Protected Cultivation

G. Alscher, H. Krug

https://doi.org/10.17660/ActaHortic.1989.248.39