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The field experiments were conducted to determine the optimum level of nitrogen and supplementary irrigation requirement to maximize the yield of sorghum (Sorghum bicolor L.) at Hamelmalo Agricultural College in the cropping seasons of 2013 and 2014. The experiments were laid out in split plot design with irrigation in main plot and nitrogen levels in subplots with three replications. The irrigation treatments were rainfed (I0), I0 + 50% of full irrigation (I1),I0 + 75% of full irrigation (I2) and I0 + full irrigation (I3).The Nitrogen levels were 18 kg N ha-1 (N0), 50 kg N ha-1(N1), 75 kg N ha-1 (N2) and 100 kg N ha-1(N3). Grain yield, stover yield and plant height were significantly affected by irrigation and nitrogen. Interaction effects showed highest average grain yield (6875 kg ha-1) and stover yield (10219 kg ha-1) in I3+N3 and lowest average grain yield (2115 kg ha-1) and stover yield (4885 kg ha-1) in I0+N0.75 kg N ha-1 with rainfed +75% of full irrigation gave optimum yield of sorghum at Hamelmalo.

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