Soybean seed size is determined partially by the variety (genetic tendency) but mostly by the growing conditions experienced at the production location. Several factors influence soybean seed size. We have generally observed that the Genuity RR2Y soybean varieties have tended to produce larger seed than the old Roundup Ready varieties. This would fit well with the common belief that larger seeded soybeans often yield more than smaller seeded varieties. Many of the surviving Roundup Ready varieties in our lineup today are larger seeded than the older varieties we have discontinued.