The study looked at how the height of seedling plates and the density of seedlings affect tobacco seedling growth. They found that using seedling plates with a height of 5cm and a density of 160 plants per plate resulted in healthier seedlings with strong roots and lower disease rates. These seedlings also had better overall growth compared to traditional methods, leading to increased economic benefits. This research suggests that using these specific seedling-raising methods can improve seedling quality and reduce costs.