WEBINAR: The Soybean Saga - Learning From the 2019 Growing Season

The challenging weather during the 2019 growing season forced many growers to make non-typical decisions. Presenter Jason Carr will explore how these decisions affected crop outcomes and discuss results from 2019 test trials. Topics covered include: fungicide application on June planted soybeans, planting date trials, and population studies. Learn how to apply learnings from 2019 to benefit future crops in this webinar.

1 CEU in Crop Management

Presenter: Jason Carr, Technology Development Representative, Bayer Crop Science


2019 Summary – Weather
  • March was cold and then wet
  • April continued this trend
  • Wet weather paused over the summer
  • 4th warmest September on record
Why do we care about GDUs in soybeans?
  • Soybeans are daylength sensitive
  • Higher than normal early accumulation of GDUs will trigger earlier flowering, extending the reproductive period
  • GDUs also affect plant maturation
    • Planting one week later correlates to a 2-day delay in maturation
Weed management
  • Important to start off clean – this was really magnified this year
  • Weed seed bank increased this year – what are the future costs?
  • Weeds will have had an impact on yield
  • “The best waterhemp is the one that never comes out of the ground.” – Eric Ifft
Seed Treatment vs. Untreated
  • Treated beans gave a 40,000 bump in established stand over untreated beans in early plantings
  • Still see benefit of fungicidal seed treatment in June when we wouldn’t see soil borne pathogens
  • All seed treatments are not created equal – must protect against the pathogens we have issues with
Planting date impact on yield
  • Didn’t see increase in yield from early plantings to later plantings
    • Early beans had a lot of stress this year – snow caused some beans to remain in the ground for over a month
    • Didn’t have any protection from seed treatment insecticide
  • Late planted beans had near-ideal conditions for emergence
Row Spacing
  • Best ROI on 20-inch rows was at 100,000 planting population
  • 20-inch row allowed lower seeding rate
  • 30-inch row spacing needed higher population to capture maximum ROI – highest overall yield was in 160k seeding rate in 30-inch row spacing
Variable population in 30-inch rows
  • Highest return when planting 120,000-140,000 seeds/acre
  • When we plant late we want to increase planting population
Fungicide Response trials
  • Maximum ROI without fungicide was at 120,000 population
  • Maximum ROI with fungicide was at 140,000
  • Even in absence of disease still saw a positive response to fungicide

Illinois Soybean Association
The Illinois Soybean Association (ISA) checkoff and membership programs represent more than 43,000 soybean farmers in Illinois. The checkoff funds market development and utilization efforts while the membership program supports the government relations interests of Illinois soybean farmers at the local, state, and national level through the Illinois Soybean Growers (ISG). ISA upholds the interests of Illinois soybean producers through promotion, advocacy, and education with the vision of becoming a market leader in sustainable soybean production and profitability. For more information, visit the website and



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