Potassium nitrate is a colorless transparent rhombic or cubic crystalline particle or white powder. [1] Potassium nitrate is widely used in the agricultural market and belongs to the category of binary compound fertilizers. Potassium nitrate is a chlorine-free potassium and nitrogen compound fertilizer, with a total content of plant nutrients potassium and nitrogen reaching about 50%, and has good physical and chemical properties. Potassium nitrate applied to tobacco has high fertilizer efficiency, is easy to absorb, promotes early seedling growth, increases tobacco yield, and plays an important role in improving tobacco quality. Can react with hydrochloric acid