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Effect of CO2 enrichment in tomato production during greenhouse ventilation

Włodzimierz Starzecki*, Andrzej Libik**

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

The experiment was carried out in a developed tomato stand (height of plants 200 cm, number of leaves 26). Into the strongly ventilated greenhouse carbon dioxide at the rate of 13 g(CO2) m-2 h-1 was supplied with the maximum efficiency of the system, this permitting the maintenance of a concentration of 500 μmol(CO2) mol-1(air). With the efficiency of the system reduced to 40% an average amount of 5 g(CO2) m-2 h-1 was supplied to the non-ventilated greenhouse, maintaining the concentration at the programmed level of 800 μmol(CO2) mol-1(air). It has been estimated that the summer greenhouse crops require 3.5-4.0 g(CO2) m-2 h-1 to carry out the photosynthetic process. In the case of a strongly ventilated greenhouse the losses of supplied CO2 reached 70%, while in a non-ventilated greenhouse they amounted to 20%, suggesting the appropriate air-tightness of the greenhouse. The strategy of CO2 enrichment of greenhouses is discused in connection with the thermal greenhouse effect.

Starzecki W., Libik A., 1999. Effect of CO2 enrichment in tomato production during greenhouse ventilation. Folia Horticulturae 11/2: 3-12.