For the past 3 years, researchers from the University of Nebraska-Lincoln (UNL) and University of Wisconsin-Madison collected survey data from producer soybean fields planted in four growing seasons (2014-2017) in 10 states in the North Central region of the U.S. — Wisconsin, Michigan, Nebraska, Illinois, Indiana, Iowa, North Dakota, Ohio, Kansas and Minnesota.

Planting date is important and usually influences soybean yield, but not necessarily in every environment and year.