Evaluation of yield and yield components of different sugar beet genotypes under drought stress

To evaluate the effects of drought stress on different varieties of sugar beet on experiment was conducted in 2009 at the research field of sugar beet seed institute in Kamal Abad, Karaj(latitude 35, 59 North and longitude 50, 75 East with 1313 m upper sea level). The experiment was a split plot with a randomized complete block design using four replicates. The main plots were the levels of irrigation with two levels(normal irrigation and irrigation time after 180mm evaporation of pan class A) and subplot with 15 varieties of sugar beet. Root yield, sugar yield, white sugar yield, sugar content, Na, K, N, white sugar content, ESC, alkalite and molasses were calculated. Results demonstrated significant effects of two factors of this experiment on all of characterstics. The normal irrigation increased 35.1% of root yield of sugar beet to compare of drought stress. In between varieties treatment in respect of root yield was significant effect. The highest root yield(variety 4) and the lowest root yield (variety 5) had different root yield at 56.37%. Among the varieties, the highest white sugar yield belonged to variety 11 and the lowest of white sugar yield belonged to variety 5.