Midwest research has documented that soybeans yield better when grown in 15 inch rows. However, there are limitations; some diseases of soybean can eliminate potential yield gains. This publication discusses several factors that should be considered when growing soybean in 15 inch row widths.
Iowa State University Extension and Outreach
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David Wright, Andrew W. Lenssen and Virgil L. Schmitt. "Intermediate Row Width Can Increase Soybean Profits" Ames, IA(2013)
Available at: http://works.bepress.com/andrew_lenssen/35/