The study looked at different types of rice plants to see which ones produced the most grain yield. They found that certain parent plants were better at producing grain yield, and when they were crossed, the hybrid plants also did well. Some hybrid plants showed a lot of improvement in grain yield compared to the parent plants. This improvement was because the hybrid plants had longer panicles and more grains per panicle. Overall, the study showed that certain combinations of rice plants can produce more grain yield than others, especially when it comes to panicle length and number of grains per panicle.