Effects seed production environmental conditions on bolting

This research was to find the effects of low temperature during seed maturity on vernalization and it’s relationship with Bolting and yield and quality of sugar beet in Dezful. In a 5 years period of time. Seeds from one multigerm bolting resistant variety were produced in Karadj, a temperate region, and Ardebil, a cold region, every year and evaluated in Dezful area for Bolting, root yield, sugar content, white sugar yield, sodium, potassium and nitrogen.Results showed that the average of Bolting percentage was 5.6% and 8.12% in Karadj and Ardebil, respectively and there was a significant difference in 5% level of probability. Average root yield was 62.9 and 60.67 t/ha in Karadj and Ardebil, respectively. There was no significant difference between them in 5% level of probability. There were significant differences between seed production years, sowing dates and sugar content. The average of sugar content was 14.75 % in Karadj and 14.5 % in Ardebil. White sugar yield was 7.77 in Karadj and 7.25 t/ha in Ardebil and there was a significant difference in 5% level of probability. Considering bolting rate, sugar yield, sugar content and white sugar yield, the seed produced in Karadj was better than that of Ardebil. Therefore, it may be stated that the rate of bolting and its quantitative and qualitative traits were affected by the environmental conditions in each area.