Frost resistance of winter cereals as a function of atmospheric CO2-concentration, temperature and soil moisture content
1996
Veisz, O. | Harnos, N. | Meszaros, K. | Tischner, T. (Magyar Tud. Akad., Martonvasar (Hungary). Mezog. Kutatoint.)
The effect of atmospheric CO2 concentration, freezing temperature and soil moisture content on the hardening and frost resistance of winter cereals was tested under controlled conditions. The frost resistance of winter wheat, rye and triticale varieties grown and hardened at an atmospheric CO2 concentration of 700 micromol x mol was better than that of plants grown at normal atmospheric CO2 concentration (350 micromol x mol). The increase in the CO2 level had a favourable effect on the hardening process, thanks to which the mean survival rate was significantly better than of the control plants. In all the varieties the increased CO2 concentration caused an increase in the leaf area and in the majority of cases the dry mass was also significantly greater. An increase in the moisture content of the soil caused only a slight increase in the killed plant rate for varieties with good frost resistance, but led to considerably greater damage in varieties with medium or poor frost resistance
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