Folia Horticulturae

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Use of an EUDW-2 system controlling CO2 enrichment in greenhouse production

Andrzej Libik*, Włodzimierz Starzecki**

**Department of Vegetable Crops
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Cracow, Poland
**The Franciszek Górski Department of Plant Physiology
**Polish Academy of Sciences
**Sławkowska 17, 31-016 Cracow, Poland

The prototype model EUDW-2 for automatic CO2 enrichment of the greenhouse atmosphere was evaluated during winter production. The EUDW-2 system was found not to be fully adequate for the requirements of the winter production of greenhouse crops. Lowering of the too high threshold of day irradiation (12 W m-2) was needed as a signal for switching on the system. In the winter a working time of 4-5 hours should be accepted, the opening of ventilator being the only factor limiting CO2 inflow. Also thermal thresholds should be absolutely excluded as unnecessary. Temperature measurements should be used as an independent auxiliary factor signaling the necessity of regulation of thermal conditions in the greenhouse. The basic parameter controlling the work of the system should be the currently adjusted precise measurement of CO2 concentration combined with the possibility of setting the maximum concentration within 1400-800 μmol (CO2) mol-1 (air) and the reduced concentration of 500 μmol (CO2) mol-1 (air) when the ventilators are open. Moreover, it is essential to introduce a threshold of 400 μmol (CO2) mol-1 (air) into the programme stopping the gas inflow, since no enrichment should take place in the case of too strong ventilation.

Libik A., Starzecki W., 1998. Use of an EUDW-2 system controlling CO2 enrichment in greenhouse production. Folia Horticulturae 10/1: 27-37.