In the new edition of Crop Insights, Pioneer Hi-Bred International agronomists follow their recent soybean tillage comparisons with "Influence of Tillage on Corn Yield in the United States and Canada."

This article presents data to help determine if no-till has a different effect on corn grain yield than conventional tillage in different regions of the United States and Canada.


  • An extensive literature review was conducted on corn research that compared yields of no-tillage to conventional fall-tillage systems in the United States and Canada.

  • The trial results were mapped by region to look for geographic and environmental patterns in the relative performance of no-tillage versus conventional tillage on corn yield.

  • The national average difference in corn yield between no-till and conventional tillage was found to be negligible with a 0.5 percent advantage to conventional tillage.

  • No-till tended to have greater yields than conventional tillage in the south and west regions. The two tillage systems had similar yields in the central United States, and no-till typically produced somewhat lower yields than con-ventional tillage in the northern United States and Canada.

  • No-till had greater corn yields than conventional tillage on moderate- to well-drained soils, but slightly lower yields than conventional tillage on poorly drained soils.

  • Corn yields tended to benefit more from no-till in crop rotation compared to continuous cropping.

  • Pioneer researchers have assigned a High Residue Suitability rating for all Pioneer(R) brand corn hybrids. The goal of this rating is to give customers guidance on selecting hybrids suitable for high-residue tillage systems.

    SOURCE: Pioneer Hi-Bred International news release.