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    S10 vs. MAP Blend – AgriFacts

    2.3-6.5 BU/AC

    MicroEssentials S10 over MAP blends

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    Objective

    Evaluate corn yield response to MAP (11-52-0), MAP + Elemental Sulfur (90% ES), MAP + AS (21-0-0-24S), MAP + AS (split-application) and MicroEssentials® S10® (12-40-0-10S).

    Overview

    • Monoammonium phosphate (MAP) is a common phosphorus (P) source used on corn.
    • Sulfur is a secondary macronutrient that is critical to maximize corn yield, but is mobile in the soil and can be prone to leaching beyond crop accessibility.
    • Ammonium Sulfate (AS) or Elemental Sulfur (ES)
      is often added to MAP and applied Preplant. Additionally, growers may apply AS as a split application to better provide late-season S.
    • MicroEssentials® S10® is a performance phosphate source that contains both sulfate- and elemental- sulfur to provide season-long availability.

    Trial Details

    Locations and Crop Management:

    CROP: Corn (Zea mays)

    YEARS: 2018-2019

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

    EXPERIMENTAL DESIGN: Small-plot RCBD with 4 replications.

    CROPPING CONDITIONS:

    Locations:14 trials across the following states – AR, IN, KS, MS, NE, SC

    All trials conformed to local cropping practices

    N Rate: Applied according to local recommendations P Rate: 80 lbs P₂O₅ /ac

    K Rate: 60 lbs K₂O/ac

    S Rate: 20 lbs S/ac

    Application Timing: All treatments applied Preplant except for one MAP + AS treatment where 10 lbs S/ac was applied at Preplant and 10 lbs S/ac was applied as AS at V3-V5 (Sidedress)

    Application Method: Broadcast Incorporated


    Results


    Summary

      • Corn yields increased with applications of sulfur.
      • Sulfur sources applied at Preplant and containing only one form of S (either Elemental or Sulfate) increased yield 1.2 – 4.3 bu/ac over MAP alone.
      • A split application (10 lbs S/ac Preplant + 10 lbs S/ac Sidedress) of AS increased yield by 5.4 bu/ac over MAP and 1.1 bu/ac over MAP+AS applied Preplant.
      • MicroEssentials® S10® increased yield by 7.7 bu/ac over MAP and added 2.3-6.5 bu/ac when compared to traditional applications of ES, AS, or split-applied AS, demonstrating the benefits of season-long sulfur availability.