Two experiments were conducted at Kandiya Research Station during the 1998/99 season, one using BA-1 and the other using KBM 20, representing normal and mammoth varieties, respectively. The objective of these experiments was to establish the optimum plant spacing, topping height and nitrogen fertilization for burley tobacco grown on the 0.9 m ridge spacing. The experiments were conducted as a 3x3x3 factorial arranged in a randomized complete block design with three replications. Treatments comprised three plant spacings, three topping heights and three nitrogen levels. The results in the present study indicate that the two Burley tobacco types (Banket A-1 and KBM 20) can be grown on the 0.9 m ridge spacing with a plant spacing of 0.8 m within the row. Reducing the plant spacing below 0.8 m (13889 plants/ha) reduced the yield and hectare return at all sites and for both varieties. Application of 200kg N/ha resulted in higher yields than the application of 120 kg N/ha at Kandiya (Banket A-1) and Madise only. The absence of significant interactions indicates that the effects of plant spacing, topping height and Nitrogen rates on yield and other parameters were independent.