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Planting Date for Asgrow® Brand Soybean Products in Southern States

January 13, 2026

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TRIAL OBJECTIVE

  • Soybeans are planted across the midsouth on many dates and into a wide variety of planting conditions.
  • The 2025 season at Scott, MS presented the opportunity for soybean planting on a variety of dates.
  • This trial was planted to evaluate the yield potential of Asgrow® brand soybean products when planted on different dates.
  • Historically, early maturity group (MG) soybean products (earlier than MG 4.4) do not respond well when planted very early into stressful conditions. These conditions were present during the early planting period; therefore, any information garnered from early planting can help growers identify the risks associated with very early planting.

RESEARCH SITE DETAILS

Asgrow Soybean Planting Date Evaluation Field Characteristics and Background

  • All field work, tillage and herbicides were per local standards.
  • All soybean seed products in this trial were treated with Acceleron® Solutions Offering STANDARD with ILEVO® Seed Treatment.
  • Asgrow® Brand Products planted:
    • AG39XF3 Brand
    • AG40XF5 Brand
    • AG43XF5 Brand
    • AG44XF4 Brand
    • AG45XF3 Brand
    • AG46XF3 Brand
    • AG48XF5 Brand
    • AG49XF4 Brand
    • AG50XF5 Brand
  • Trial Design
    • Single replication strip plot
    • 8 row plots, 145 feet long (0.12 acres/plot)
    • 38-inches x 7.5-inches, twin row planting
  • Data Collected
    • Machine harvested yield, at 13.5% moisture content, for three planting dates.
    • Soybean products were desiccated or harvested at maturity.

UNDERSTANDING THE RESULTS

  • The early planting season of 2025 at Scott, MS was a particularly stressful, slow growing environment. Extended periods of cloudy, cool wet weather along with repeated rainfall events characterized late March and early April.
  • The March 28 planting date was exposed to an extended period of stressful, cool, wet weather from emergence to plant establishment. The average nine-product yield for each planting date shows the effect of early growing season stress (Figure 1).
  • Even though all early planted yields were depressed by stress, the soybean products later than MG 4.5 were higher yielding than the earlier products – 37.6 compared to 45.8 bu/acre, respectively. This potential should be acknowledged when selecting soybean products to plant very early.
  • The April 14 planting date shows some recovery in yield potential since stresses had moderated by that time as temperatures had warmed somewhat to more normal levels of 65 to 70°F. In this trial, Asgrow® AG43XF5 brand was particularly high yielding on this planting date (88.5 bu/acre) and appeared to have that potential all season (Figure 2).
  • The May 6 planting date showed similar potential to the April 14 date particularly when the April 14 date is considered without Asgrow® AG43XF5 brand included in the average – about 55 bu/acre for both dates (Figure 1). This points out that in this trial; weather seriously influenced the March 28 planting date and had moderated by the planting and emergence periods for the later planting dates.
  • In this study and in general, the highest yield potentials were measured with the later maturing soybean products (RM 4.3 and later) planted on the later planting dates of April 14 and May 6. This is a typical result across most of the midsouth (Figures 2 and 3).
Average soybean yield performance for Asgrow soybean products with 3 different planting dates in the Mid-South.
Figure 1. The average yield of nine Asgrow® brand soybean products was lowest in this trial for the March planting date because of unfavorable growing conditions.


Soybean yield performance for nine Asgrow products with 3 different soybean planting dates in the Mid-South.
Figure 2. Yields for each soybean product for each planting date. In general, the later maturing soybean products demonstrated higher yields for each planting date in this trial.


Nine Asgrow soybean products broke out individually with soybean planting dates for each soybean seed in the Mid-South.
Figure 3. In general, the later maturing soybean products in this trial demonstrated higher yields for each planting date in this trial.

KEY LEARNINGS

  • Planting date and associated weather conditions can have a serious impact on soybean yield potential.
  • Reductions in yield potential on early planting dates are typically an interaction with cold, wet, slow growth conditions. In this trial, it was particularly evident with the earlier maturity group soybean products. Though this trial was planted on a clay loam soil type, this situation was also noted on sandier soils at the Scott Learning Center during the 2025 growing season.
  • These data help reinforce the potential planting date and maturity group interactions that growers should consider when deciding to plant soybean products into stressful conditions.
  • Please contact your local Asgrow® brand representative for more information.

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