Four rates of nitrogen fertilizer (0, 152, 180, and 212 Kg/ha active ingredient) were applied to silty clay soil in two years experiment at Bakrjo Research Station in Sulaimaniyah, Iraq, to determine their effects on certain agronomic (plant height, leaf area, number of leaves and flowering rate) and some economic (yield kg/ha. and grade percentage) characteristics of burley tobacco (variety Burley 21). The influence of nitrogen was significant on the yield which increased from 1 454.5 kg/ha. (without N) to 1977 kg/ha (when 180 kg/ha. of N were added) but it had no apparent effect on grade percentage. There was a little response to N in the terms of plant height and number of leaves. The leaf area was increased with adding N by (32,83%, 34,47% and 69,51%) compared to not fertilized treatment. The flowering rate showed similar response.