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Northern Illinois Agriculture

University of Illinois Extension

Soybean maturity and planting date research

Posted by Russel Higgins -

Jake Vossenkemper, graduate research assistant in the Department of Crop Sciences at the University of Illinois shared preliminary findings on a three year research project evaluating yield effects from soybean maturity and planting date at the NIARC Agronomy Day. At the end of this growing season; two years of data will have been collected at our research center. The take home message from Jake's presentation for northern Illinois soybean growers;

  • Soybean yield begins to decrease as planting is delayed beyond late April, and yield loss accelerates as planting is delayed past mid-May.
  • Well-adapted, full season varieties generally produce higher yields than early-maturing varieties, especially at early planting.
  • Based on his preliminary results, you can expect well-adapted,full season varieties to have more days of reproductive development and (often) higher grain yield with early planting.
  • In northern Illinois, that would be maturities ranging from 2.6 to as full as 3.4

We will share the 2014 NIARC results post-harvest. The early and late planting dates (both significantly affected by weather) are May 20th and June 27th.

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