eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-09-25 13 3 1435 1447 10.13005/bbra/2287 14935 article Tohid Nooralvandi 1 Davood Habibi 1 Dariush Fathollah Taleghani 2 Ali Kashani 1 Farzad Paknejad 1 Department of Agronomy and Plant Breeding, Islamic Azad University, Karaj Branch, Alborz, Iran. Sugar Beet Seed Institute, Research, Education and Extension Organization, Karaj, Iran. One of the main problems about cultivation of sugar beet in Moghan region is the growth of aerial organ, while in Karaj the problems is reduction of sugar cutie and yield that are due to high temperature of harvest time and water stress. Present paper was carried out for 1 year using strip split block experiment in the form of complete accidental blocks with 4 times repetition in 2 different regions; irrigation was done in tape form. Experimental factors included 4 levels of N: non-application, 13, 19 and 25 mg/kg and 4 different varieties of sugar beet were experimented: Pars, Ekbatan, Razor and Flores; and the third factor was methanol spraying in 3 levels: non-application, 10 and 20% by volume. In Karaj region, the most yield achieved due to interaction effect of Razor*non application of methanol (78043 kg/hectare). In Moghan region, the most root yield achieved due to Pars var.* 20% by volume of methanol (92286 kg/hectare) that was classified in the same statistical group with Flores* 10% and 20% by volume of methanol and Pars var.* 10% by volume of methanol (91296, 85725 and 87543 kg/hectare in order). The result of compound analysis indicated that the main effects of region, N, variety and methanol had significant effect on catalase activity amount in 1% level as well as interaction effects of N*variety, N* methanol, variety* methanol and N*variety*methanol. According to the results of experiment in two regions, selection of proper variety can be the most crucial factor beside application of balanced level of methanol and management of N fertilizer at optimum level in order to improve the yield. https://www.biotech-asia.org/vol13no3/evaluation-of-nitrogen-levels-and-methanol-spraying-on-the-yield-yield-components-and-catalase-activities-of-sugar-beet-in-karaj-and-moghan-region/ Sugar beet; yield of white sugar; root yield; catalase; Karaj; Moghan