The researchers studied how to increase the yield of a type of rice called "Hanyouxiangqing" by testing different planting methods and fertilizers. They found that the key to getting high yields is to plant early, use the right amount and type of fertilizer, control the number of seedlings, and prevent diseases. The "Hanyouxiangqing" rice has strong roots, absorbs nutrients well, produces many tillers with big ears, and prevents false smut disease. By following these techniques, farmers can grow more rice and improve its quality.