The study looked at how rapeseed is distributed from a seed metering system to improve seeding quality. By using computer simulations and bench tests, the researchers found that the size and height of the seed tube affect where seeds land. A tube diameter of 15 mm and a dropping height of 1100 mm resulted in more uniform seed distribution. The way seeds bounce off the tube also impacts seeding uniformity. Bench tests showed that seed distribution varied depending on the tube diameter and spacing between ridges. Field experiments showed that seedling distribution varied as well. These findings help understand why seed distribution varies and can help improve seed-metering systems.