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    Soybean Blend Study – AgriFacts

    2.2 BU/AC

    Increased yield with K-Mag

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    Objective

    Evaluate soybean yield response to MOP (0-0-60) and K-Mag® Premium (0-0-21.5-10.5Mg-21S).

    Overview

    • Muriate of Potash (MOP) is a common potassium (K) fertilizer used in soybean production.
    • New university research highlights the need for sulfur (S) on soybean due to higher grain yields and lower atmospheric deposition.
    • Soluble magnesium (Mg) has been documented to improve photosynthesis, enzyme activation, and grain yield.
    • K-Mag is a unique 3-in-1 nutrient source that features low chloride, water soluble nutrients, and does not affect soil pH; regardless of rate.

    Trial Details

    Locations and Crop Management:

    CROP: Soybean (Glycine max)

    YEARS: 2018-2019

    DATA SOURCE: Field studies conducted by third-party, independent researchers.

    EXPERIMENTAL DESIGN: Small-plot RCBD with 4 replications.

    CROPPING CONDITIONS:

    All trials conformed to local cropping practices

    P Rate: 40 lbs P₂O₅/ac applied as DAP (18-46-0) or MAP (11-52-0)

    K Rate: 60 lbs K₂O/ac as either MOP or a blend of MOP (50 lbs K₂O/ac) + K-Mag (10 lbs K₂O/ac)

    Application Timing: Preplant

    Application Method: Broadcast Incorporated



    Summary

    • Replacing a small amount of MOP with K-Mag increased soybean yield by 2.2 bu/ac over MOP when averaged across 22 trials (2018-19).
    • These results demonstrate the value of K, Mg, and S for current soybean genetics and production systems.
    • Access additional yield data, ROI calculators, and resources at K-Mag – Performance.