Machine-transplanted hybrid rice can achieve high grain yields with the right plant traits. In this study, researchers found that primary-tiller panicle number is crucial for high yields. Main stems and secondary tillers don't have as much impact. Primary tillers contribute significantly to total grain yield, with panicle number being the key factor. This means that focusing on increasing primary-tiller panicle number is essential for maximizing grain yields in machine-transplanted hybrid rice.