Optimum Emergence Temperature for Okra Seeds

抄録

Seeds of three okra (Abelmoschus esculentus) cultivars were sown in plastic containers with artificial soil mix, and their emergence was examined at 17.5°C, 20°C, 25°C, 30°C, 35°C and 40°C to determine the optimum emergence temperature of the seeds. Emergence started earlier in the 30°C, 35°C and 40°C groups than in the other groups for all three cultivars at two days after sowing, and the emergence percentages on the day of emergence were higher for the 35°C group in two cultivars than for the other groups and for the 35°C and 40°C groups in one cultivar. On the day following emergence, a higher percentage of emergence for all three cultivars was obtained at 35°C than at 40°C. At 30°C and below, the emergence of all three cultivars was delayed as the temperature decreased. The average number of days to emergence was shorter in the 35°C group than in the other groups for one cultivar and in the 35°C and 40°C groups for two cultivars. The final emergence percentages during the study period were 94.7-99.7% in the 20°C, 25°C, 30°C and 35 °C groups in two cultivars and 86.3-91.7% in the 25°C, 30°C and 35°C groups for one cultivar. Based on these results, the optimum emergence temperature for the okra seeds of the three cultivars was 35°C within the limits of the experiment.