Stair Step Soybean Management

Trial Objective

  • To determine if various agronomic inputs could reduce the impact of environmental, weed, disease, and insect stresses in soybean.

Research Site Details


  • Two soybean products, a 2.8 and 3.7 relative maturity, were used and planted in a 30-inch twin-row configuration.
  • Treatments included:
    • RI: Rhizobium inoculant alone (Optimize®)
    • FF: Foliar fungicide alone (Delaro® 325 SC fungicide) applied at growth stage R3
    • RI + FF: Rhizobium inoculant + foliar fungicide at R3
    • FI: Foliar insecticide alone (Warrior®) at R3
    • RI + FI: Rhizobium inoculant + foliar insecticide at R3
    • FI + FF: Foliar insecticide at R3 + foliar fungicide at R3
    • RI + FI + FF: Rhizobium inoculant + foliar insecticide at R3 + foliar fungicide at R3
    • UTC: Untreated control



Understanding the Results

  • The combination of all three inputs, rhizobium inoculant, insecticide, and fungicide (RI + FI + FF), as well as the insecticide and fungicide combination (FI + FF) provided the highest average yield for both soybean products.

What Does This Mean for Your Farm ?

  • Achieving maximum soybean yield potential depends on management practices that minimize plant stress and reduce the impact of environmental conditions on plant health.
  • Reduction of stresses with the use of fertilizer, inoculant, fungicide, and insecticide can help achieve maximum yield potential.
  • Agronomic practices, such as row spacing, proper planting date, and population, can help reduce the impact of environmental stresses.