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Key tactics for weed free double-crop soybean farming

Key tactics for weed free double-crop soybean farming

By Blake Jackson

Planting double-crop soybeans after harvesting barley or wheat comes with its own set of weed control challenges. Here's a breakdown of key strategies to ensure a weed-free growing season:

Early Intervention is Key:

  • Pre-Planting Burndown: A weed-free seedbed is crucial. Glyphosate is an option for susceptible weeds, but glyphosate-resistant marestail requires a different approach.
  • Enlist Varieties: Planting Enlist E3 soybeans allows for immediate post-planting application of Enlist One or Duo for weed control.

Marestail Control Strategies:

  • Tank-mix Options: For glyphosate-susceptible marestail, glyphosate can be tank-mixed with Sharpen and 2,4-D LVE for burndown and control of marestail stumps.
  • Post-emergence Options: Liberty or glufosinate-based products offer effective control of marestail in LibertyLink or Enlist E3 varieties.

Palmer Amaranth and Waterhemp Control:

  • Residual Herbicides: Consider using residual herbicides like Dual Magnum, Warrant, or Authority before weed seed germination, especially if these weeds are prevalent. Rainfall is crucial for activation.

Additional Tips:

  • Tank-mixing: Mixing herbicides can broaden the spectrum of weed control and improve residual activity.
  • Non-GMO Options: For non-GMO soybeans, several post-emergence herbicides are available, but be aware of potential soybean injury and ineffectiveness against marestail.

Important Considerations:

  • Planting Restrictions: Some herbicides require waiting periods between application and planting.
  • Dicamba Risk: Avoid using dicamba due to high drift potential and crop sensitivity. The application deadline has also passed.

By following these guidelines and consulting with local experts, double-crop soybean growers can achieve effective weed control and maximize their yield potential.

Photo Credit: istock-sandramatic

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Categories: Pennsylvania, Crops, Soybeans

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