Folia Horticulturae

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Winter production of lettuce cv. Isolde in a greenhouse with CO2 enriched atmosphere

Włodzimierz Starzecki*, Andrzej Libik**

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

Winter production of lettuce cv. Isolde (harvested on 12th February 1997) was carried out in a greenhouse in conditions of CO2 enrichment controlled by the monitoring system EUDW-2 constructed in the laboratory, already in commercial trials. Two variants of the vegetation conditions were used, i.e. exposure of the lettuce to daylight or to 10-20% shading, changes in the area of leaf blades, in the ratio of leaf blade lenght to breadth, and in the number of leaves developing on plants being recorded.

Compared with control objects the CO2 enrichment caused: 1. an increase in leaf area by 28% in the variant with daylight and by 55% in the shaded stand, 2. changes of the leaf shape from elliptic to circular, which were more distinct in the fully illuminated plants, and 3. an increase in the leaf number by 18% in the shaded stand and by 9% in full light. The commercial yield of CO2 fertilized plants was increased by 52% in the shaded stand and by 47% in light, this corresponding to fresh weight increases of 49 and 59 g, respectively as compared with the yield of control plants.

Starzecki W., Libik A., 1998. Winter production of lettuce cv. Isolde in a greenhouse with CO2 enriched atmosphere. Folia Horticulturae 10/2: 3-14.