The field trials were conducted during the wet seasons of 2009 and 2010 at the Institute for Agricultural
Research (IAR) farm Samaru (Latitude 110 11‘N, Longitude 70 38’E and 686m above sea level) in the Northern Guinea Savanna ecological zone of Nigeria. The treatments consisted of two sesame varieties (NCRIBen001M
and NCRIBen002M ), four nitrogen levels (20, 40, 60 and 80kgN/ha) and three intra row spacing (5, 10 and
15cm). The treatments were arranged in a split plot design with three replications. The factorial combination of
N levels and varieties were assigned to the main plot while intra row spacing was placed at the sub plot.The
gross plot size was 3.0m x 3.0m (9m2 ) and the net plot is 3.0m x 1.5m (4.5m2).