The study looked at how nicotine levels in sun-cured red tobacco are affected by different amounts of fertilizer. They used a specific type of tobacco plant and tested three different fertilizers. The researchers found that nicotine levels in the tobacco increased rapidly after 50 days of planting. The highest nicotine accumulation in the leaves and roots occurred around the 60th day, while in the stem it was around the 70th day. Nicotine was highest in the leaves, followed by the stem and then the roots. The study also showed that the total sugar content decreased with more nitrogen fertilizer, while nicotine levels increased with higher amounts of fertilizer applied to the plants. This research helps in understanding how to produce sun-cured red tobacco more effectively.