The study looked at different ways of planting tobacco in Linyi to see which method worked best. They tested three methods and found that planting tobacco using the down-film method of the 'Well-cellar' and small seeding was better than the usual spring planting. The down-film methods made the tobacco plants grow faster, survive better, and resist diseases more effectively. Overall, the down-film methods improved the growth of tobacco plants in the field compared to the traditional spring planting method.