CO2 balance in tomato production in a plastic tunnel of the
The Franciszek Górski Department of Plant Physiology
Polish Academy of Sciences
Sławkowska 17, 31-016 Kraków, Poland
Changes in CO2 concentration in a plastic
tunnel with a tomato crops of cv Ostona were investigated, directional
changes of the concentration being determined in the diel cycle. Owing to
CO2 consumption in the photosynthetical
process and to the limited CO2 exchange
with the outdoor atmosphere the concentration of this gas in the stand
decreases to about 200 μmol (CO2)
mol-1 (of air) during the day. In the
zone near the soil only is the concentration higher owing to CO2
evolution in the respiration process of the soil and of the root system of
the plants. At night the participation of whole plants in the respiartion
process associated with metabolic changes of the soil increase the
concentration to about 500 μmol (CO2)
mol-1 (of air), this being reflected in
the intensification of photosynthesis in the morning hours when the
utilization of CO2 accumulated during the night occurs.
The calculation of the amount of CO2 fixed by the crop and of the level
of its evolution from the soil shows that, depending on the weather
conditions, the CO2 requirement of the
photosynthetic process exceed 2.5-3.5 times the amount of CO2
derived from soil respiration.
In long plastic tunnels the recorded decreases in CO2 concentration
in a plant stand of great density lead to inhibition of the photosynthesis
process and hence the limitation of yield.
Mydlarz J., 1997. CO2 balance in tomato production in a plastic tunnel of
the "Skierniewicki" type. Folia Horticulturae 9/1: 113-124.