Tillage helps manage residue, controls weeds, incorporates soil amendments and is used extensively to prepare a seedbed for planting. However, research shows that tillage has little effect on soybean yields in Iowa. This publication identifies how no-tillage can reduce input costs without sacrificing soybean yield.
Iowa State University Extension and Outreach
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David Wright, Mahdi Al-Kaisi and Andrew W. Lenssen. "Influence of Tillage on Soybean Production in Iowa" Ames, IA(2013)
Available at: http://works.bepress.com/andrew_lenssen/34/