A pot-culture experiment was conducted at the Bangladesh Institute Nuclear Agriculture farm, Mymenshingh during the period of March to June, 2003 to determine the physiological characteristics and yield performance of the different sesame genotypes/varieties under different levels of N-fertilization. The experiment was carried out in Randomized Complete Block Design (RCBD) with two factors having three replications. Six nitrogen levels (0, 20, 40, 60, 80 and 100 kg N per ha) and four genotypes/ varieties of sesame (SM3, SM9, S30 and BT1) were used in the experiment. The results indicated that...