The Effect of High Temperatures on the Growth of Oriental Cabbages, Poster Board #319

This study was carried out to investigate growth responses and physiological disorders of oriental cabbage grown at artificially treated high temperature conditions. A higher number of leaf and larger leaf area were observed when the plants were grown at 20 °C, a proper temperature for the growth of oriental cabbages, in comparison to 25 °C. The differences in the growth rate were largest at 70-day after the germination. However, no signifiant differences were observed between 20 °C and 22.5 °C. A significant differences in fresh weight and dry weight were also shown depending on the degrees of temprature treated. Oriental cabbages grown at 20 °C showd higher fresh weight and dry weight, as compared to 25 °C. This observation became more significant as the plant continued to grow. The fresh weight per plant grown at 22.5 °C and 25 °C accounted for 96% and 85% of the fresh weight per plants grown at 20 °C. Therefore, 15% reduction in yield resulted from the treatment of a high temperature 25 °C compared to 20 °C. No soft rot disease was observed at 25 °C compared to 20 °C, but 1,2% of the plants grown at 25 °C was infected by the disease and this caused reduction in leaf quality.