December 20, 2019
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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