The objective of the experiment was to investigate the effect of different sources of N on tobacco with a view to obtain alternative and most economical sources for sidedressing application. Sidedressing experiments were conducted in 1989 and 1990. Five sources of N consisting of NH4NO3, NaNO3, KNO3, nitrate of soda potash and urea were studied. The sidedress were applied at the rate of 20 kg N/ha at 14, 21 and 35 days after transplanting (DAT). The treatments were arranged in a 3 x 5 factorial laid out in complete randomized block design with two replications. The results from both 1989 and 1990 experiments showed that there was no significant difference among the sources tested, both in terms of yield and leaf quality. However, the results showed the trend that sidedressing with urea gave comparable yield in 1989 and even higher yield in 1990 compared with nitrate-N sources. Results on the time of application showed that there were no significant differences in terms of yield and quality for both years. A trend of decreasing in yield with increasing DAT for sidedressing was obtained. Generally, sidedress application should be made between 14 to 21 DAT for higher yield and quality. Application later than 35 DAT resulted in yield reduction.