Evaluations on the effect of potassium source on the formation of tobacco-specific nitrosamines (TSNA) in dark and Burley types of tobacco have been of recent interest. Previous field research at the University of Kentucky has observed reductions in total TSNA associated with applications of potassium chloride (KCl) compared to potassium sulfate (K₂SO₄). It is now recommended that Burley and dark tobacco producers incorporate potassium chloride with a maximum rate of 113 kg/ha in the potassium fertility program. The objective of this study was to further investigate how potassium source and a combination of potassium sources to supply the total potassium requirement impact the moisture content and total TSNA in cured leaf. Applied field research experiments were conducted in dark fire-cured tobacco at Princeton, Kentucky, and Burley tobacco at Lexington, Kentucky, imposing four treatments (untreated control; 100 % KCl; 100 % K₂SO₄; 70 % K₂SO₄ + 30 % KCl). Preliminary data suggests that potassium applications that utilized 100 % KCl had statistically higher moisture in the cured leaf for both dark fire-cured and Burley tobacco types. The impact of these treatments on total TSNA content will be presented. Results from this study will be used to supply updated information for potassium fertility recommendations in Burley and dark tobacco types.