The study looked at how different types of potassium fertilizer and depths of application affect tobacco yield and quality. They found that using coated potassium fertilizer increased tobacco yield and value compared to potassium sulfate. Applying potassium fertilizer at a depth of 20 cm was more beneficial than at 10 cm. The best results were seen with topdressing bio-oil coated potassium fertilizer at 20 cm. Overall, deep application of coated potassium fertilizer at 20 cm improved tobacco yield, economic benefits, and potassium utilization efficiency.