Summary
Under phytotronic conditions investigations were made on the effect of important environmental factors, such as temperature, water and an increasing concentration of atmospheric CO2, on the hardening of young cereal plants.
In all the varieties derived from the major wheat growing regions of the world the hardening process was favourably influenced by a doubling of atmospheric CO2 content, so that a significantly larger number of plants survived the frost test than for plants of the same variety raised under normal conditions.
A reduction in freezing temperature and an increase in soil moisture content caused a slight reduction in survival % for varieties with excellent frost resistance and a great reduction for those with medium or poor frost resistance.
Predictions suggest that in Central Europe, as the result of global climatic changes, there will be a reduction in the quantity of winter precipitation, a considerable rise in winter temperatures and an increase in atmospheric CO2 concentration. Judging by the experimental results, these changes could improve the overwintering of winter cereals; at the same time, however, a number of factors (mainly the reduction of precipitation) leading to yield losses must be expected during the vegetation period.
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Veisz, O., Harnos, N., Szunics, L. et al. Overwintering of winter cereals in Hungary in the case of global warming. Euphytica 92, 249–253 (1996). https://doi.org/10.1007/BF00022852
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DOI: https://doi.org/10.1007/BF00022852