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    Corn – Fall vs. Spring Broadcast – AgriFacts

    5.3 BU/AC

    Increase with Aspire over MOP Spring Application

    4.8 BU/AC

    Increase with Aspire over MOP Fall Application

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    Objective

    Evaluate the yield response of corn to Aspire® (0-0-58-0.5B), MOP (0-0-60) and MOP + Granular B (0-0-0-14.3B) blend in fall vs. spring applications.

    OVERVIEW

    • MOP is commonly used as a potassium (K) source in corn production with applications made in both spring and fall, depending on region and seasonal workload.
    • Micronutrients such as boron (B) are essential for plant growth, yet often overlooked in balanced crop nutrition.
    • Granular B products can be blended with K, but results in an uneven distribution of B. Additionally, boron is mobile in the soil and is prone to leaching.
    • Aspire® is a premium potash that includes two forms of boron to deliver season-long availability and a more flexible application window, regardless of application timing.

    TRIAL DETAILS

    Crop: Corn (Zea mays)

    Years: 2016–2017

    Data Source: Field studies conducted by third-party, independent researchers.

    Experimental Design: Small-plot RCBD with 4 replications.

    Cropping Conditions:

    N Rate: Recommended nitrogen (N) was applied in spring and balanced across all treatments.

    K Rate: 60 lbs K₂O/ac applied as MOP or Aspire®

    P Rate: 80 lbs P₂O₅/ac applied as MAP and balanced across the entire trial

    B Rate: 0.5 lb B/ac applied as Granular B or Aspire®

    Application Timing: Fall vs. spring preplant

    Application Method: Broadcast incorporated


    RESULTS


    SUMMARY

    • Corn yields increased with the addition of potassium and boron.
    • Highest corn yields were achieved with Aspire® treatments in both fall and spring application timings.
    • Fall: Aspire® yields were +4.8 bu/ac over MOP and +2.2 bu/ac over a MOP + Granular B blend.
    • Spring: Aspire® demonstrated a +5.3 bu/ac yield advantage over MOP and a +1.9 bu/ac increase over a MOP + Granular B blend.
    • Peak yields achieved with Aspire® demonstrate the benefits of boron in corn production and the advantages of Nutriform® technology, which provide uniform nutrient distribution compared to a MOP + Granular B blend.