Effect of Nitrogen and biological Fertilizers on Seed Yield and Fatty acid Composition of Sesame cultivars under Yazd conditions

To investigate the effect of different levels of nitrogen fertilizer and biofertilizers Azotobacter sp. and Azosprillum sp. on seed yield، oil yield and its percent and fatty acid composition in three sesame (Sesamum indicum L.) cultivars an experiment was conducted using splite plot factorial arrangement based on randomized complete block design with three replications at Agricultural and Natural Resources Reasearch Center of Yazd in 2009 cropping season. The treatments included: cultivars (Darab-14، Jiroft and Yazdi) assigned to main plots، nitrogen fertilizer (0، 25 and 50 kg ha-1) and biofertilizer (inoculation and no-inoculation) as factorial were randomized in sub-plots. Oil percent was measured using the Soxhlet method and fatty acid composition was measured using GC method. Results showed the significant differenc among three varieties concerning seed yield، oil yield and four fatty acids (oleic، linoleic، palmetic and stearis acid). Seed yield، oil yield، Oleic، Linolenic and Arasshidic acid significantly increased with applying N fertilizer. Seed yield، oil yield and linolenic acid percent significantly increased with applying biofertilizer. Oleic acid percent had negative and significant correlation with Linoleic acid (r = -0. 759**) and stearic acid (r=-0. 774**) percent. Generally، results showed the importance of applying biofertilizers against chemical fertilizers to protect the environment from harmful chemical pollution.