Defining optimal soybean seeding rates and associated risk across North America

Soybean [ Glycine max (L.) Merr.] seeding rate research across North America is typically conducted in small geo‐political regions where environmental effects on the seeding rate × yield relationship are minimized. Data from 211 individual field studies (∼21,000 data points, 2007–2017) were combined from across North America ranging in yield from 1,000– 7,500 kg ha −1 . Cluster analysis was used to stratify each individual field study into...