Effects of Row Configurations on Yield Potential of Asgrow® Soybean Products

Trial Objective

  • To evaluate the yield potential of Asgrow® brand soybean products planted in multiple planting configurations and the ability of these products to compensate across row configurations.

Research Site Details

  • Plots were approximately 0.2 acres and treatments were not replicated.
  • The number of plants in 1/1000th of an acre was counted after full emergence in each plot to measure final plant stand.
  • All plots were desiccated and harvested as per local standards at the appropriate maturity.
  • Seven Asgrow® soybean products were tested.
  • Five different row configurations were planted at the appropriate seeding rates with the goal of attaining final stands of around 100,000 plants/acre.
  • Row configurations, seeding rates, and equipment used included:
    • 38-inch twin rows planted at 130,000 seeds/acre using a twin-row 75-inch x 38-inch Monosem® planter.
    • 38-inch single rows planted at 130,000 seeds/acre using a John Deere® Precision-equipped Planter.
    • 30-inch single rows planted at 130,000 seeds/acre using a John Deere® Precision-equipped Planter.
    • 7.5-inch drilled rows planted at 160,000 seeds/acre using a non-precision grain drill.
    • Broadcast planted at 160,000 seeds/acre using a broadcast spreader. Seed size (seeds/lb) was accounted for and samples were weighed by product for planting. Broadcast beds were lightly tilledo incorporate the seeds. Most seeds emerged quickly with additional emergence occurring after a rain.




Understanding the Results

  • The 2018 planting season had no issues with drainage as in previous years resulting in high yield potential.
  • Plant Population (Figure 2):
    • Target stands were achieved in all row-planted treatments with 70 and 80% emerged stands.
    • The drilled plot emerged at an average of 245% of the planting goal due to the unreliability of a grain drill. Yields were not greatly affected by this overplanting, although seed cost was higher.
    • Approximately 50% emergence was measured in the broadcast plot.
  • Yields (Figure 3):
    • Minimal differences in yield were observed across the different row configuration treatments. The drilled plot had reduced yield, likely due to lodging or disease issues associated with the extremely high stands.
    • All other treatments yielded similarly in the 70-80 bu/acre range.
  • AG49X6 brand showcased lower yields in all treatments due to disease susceptibility (Figure 4). AG49X6 and AG51X8 brands will not be sold due to disease susceptibility but were included for comparison.

What Does This Mean for Your Farm?

  • The 2018 demonstration study results reinforce previous SLC research indicating that soybean respond well to various planting configurations and can compensate for suboptimal stands.