Scientists have been working on breeding rice for high yield. They found that combining different types of rice plants can increase grain yield. By crossing indica and japonica varieties, they created new hybrids like Nanjing 35 and Yayou 2, which showed high yield potential. However, Yayou 2 had issues with seed purity and sensitivity to environmental conditions. Recently, a hybrid called Liangyoupeijiu was developed, reaching high yields of 10-10.5 t/ha in various climates. This hybrid has been widely planted and is considered a pioneer in super hybrid rice breeding. The key to success lies in using strong heterosis from crossing indica and japonica varieties, along with specific plant characteristics and adaptability to different environments.