Comparison of Three Soybean Herbicide Tolerant Systems in Iowa and Minnesota

TRIAL OBJECTIVE

  • This trial was designed to evaluate the benefits of three competitive soybean systems:

    • Roundup Ready® Xtend Crop System  
    • LibertyLink® GT27™ System
    • Enlist™ Weed Control System with Enlist E3® Soybeans 
  • Field observations collected were:

    • Yield (bu/acre) 
    • Weed control (%)

 

RESEARCH SITE DETAILS

  • For each research location, three locally adapted soybean products were selected for each herbicide-tolerant system.

  • The 10 ft x 200 ft plots were planted, sprayed, and harvested as strip trials.

UNDERSTANDING THE RESULTS

  • Weed control at the time of both crop canopy (Figure 1) and harvest (Figures 2 and 3) was highest for the Roundup Ready® Xtend Crop System, then the Enlist™ Weed Control System, and lowest for the LibertyLink® GT27™ System.

  • The Late POST application at Mapleton, MN did not substantially improve weed control in the LibertyLink® GT27™ System (Figures 1 and 2).

  • The Roundup Ready® Xtend Crop System produced the highest average yield at all locations, followed by the Enlist™ Weed Control System with Enlist E3® Soybeans; except at Manchester, IA where the LibertyLink® GT27™ System out-yielded the Enlist™ Weed Control System (Figure 4).

     

KEY LEARNINGS

  • Yield potential and weed control are two of the many factors to consider when deciding which soybean production system should be utilized on your farm.  

  • Farmers should make sure that their pre-emergence and post-emergence weed management programs include overlapping residual products for an effective season long control.

  • Herbicide application timing and the environment have significant effects on weed control. Farmers should always endeavor to apply when weeds are less than 4 inches tall for the most effective control.

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