Soybean Product Response to PPO Herbicides

TRIAL OBJECTIVE

 

  • PPO herbicides, such as sulfentrazone and flumioxazin, are important residual herbicides in a soybean weed control program.

  • Soybean injury from these herbicides has occurred early in the growing season, typically from cool, wet growing conditions.

  • Questions have arisen if there are differences in how soybean varieties respond to these herbicides.

 

RESEARCH SITE DETAILS

Location Gothenburg, NE Planting Date 6/03/2019
Soil Type Hord Silt loam Harvest Date 10/14/2019 
Previous Crop Corn Potential Yield (bu/acre) 80
Tillage Type Strip Tillage Seeding Rate (seeds/acre) 160K

 

  • The study was set up as a split plot with three replications where PPO herbicide was the whole plot and soybean product was the subplot. 
  • Nine soybean products (listed below in Table 1), ranging in maturity from a 2.5 to 3.5 MG, were evaluated. 
  • PPO herbicides applied at planting (June 5, 2019) included:
    • Sulfentrazone at 0.3125 lb ai/acre
    • Flumioxazin at 0.096 lb ai/acre
    • Untreated 
  • Plots were sprinkler irrigated and weeds were controlled as needed with no additional fungicide or insecticide applied. 
  • Plots were harvested, and yield was calculated.

 

UNDERSTANDING THE RESULTS

 

  • The main factors of the research, PPO herbicide treatment and soybean product, impacted yield. 
    • Figure 1 reports the average yield across all soybean products, where sulfentrazone negatively impacted yield while the flumioxazin treatment and the untreated plot had similar yields.       
      • Potential soybean injury from flumioxazin and sulfentrazone is dependent on weather conditions around application.  In this instance, no response was observed from flumioxazin.
  • Although the interaction of soybean product by PPO herbicide was not significant, the values are listed in Table 1 to provide additional insights.

 

Figure 1. PPO herbicide impact on yield across all soybean products.
No visual differences were observed late in the growing season across the entire study when comparing PPO treatments and soybean products.

No visual differences were observed late in the growing season across the entire study when comparing PPO treatments and soybean products.

KEY LEARNINGS

 

  • PPO herbicides can impact soybean yield differently.
  • Farmers should weigh the benefits of flumioxazin or sulfentrazone as part of their residual weed control program against the potential negative impact on yield these herbicides can sometimes cause.  

 

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