February 2015

MicroEssentials® SZ® Nutrient Efficiency in Winter Wheat


Evaluate the yield response of winter wheat to MicroEssentials® SZ® (12-40-0-10S-1Zn), MAP (11-52-0) and a MAP + AS (21-0-0-24S) + ZnSO₄ (0-0-0-16.5S-36Zn) blend at three different phosphorus (P) rates.

Compare the grain concentration of phosphorus (P), sulfur (S) and zinc (Zn) across treatments of MAP, MAP + AS + ZnSO₄ and MicroEssentials® SZ at a rate of 60 lbs P₂O₅/ac.


  • Monoammonium phosphate (MAP) is commonly used as a P fertilizer applied to winter wheat.

  • In addition to nitrogen (N) and P, other nutrients like S and Zn are beneficial to achieve maximum yield and better nutritional quality.

  • MicroEssentials® SZ® contains N, P, S and Zn in one nutritionally balanced granule, providing the uniform nutrient distribution, improved nutrient uptake and season-long sulfur availability required for higher yields and profitability.


Crop: Winter Wheat (Triticum aestivum, winter)

Years: 2012-2014

Locations: 17 trials across the U.S. and Canada
United States – IL, IN, KS, MS, NE, OH, OK, VA
Canada – ON


Cropping Conditions:

P Source: MAP, MAP + AS + ZnSO4 and MicroEssentials® SZ

P Rate: MAP and MicroEssentials® SZ®: 0, 30 and 60 lbs P₂O₅/ac MAP + AS + ZnSO₄: 60 lbs P₂O₅/ac

K Rate: As required by soil test, applied to entire trial

Application Timing: Preplant

Application Method: Broadcast

Parameters Measured: Grain Yield
Grain nutrient conectnration P, S, Zn (12 of 17 locations)


Wheat yield response to different P sources and rates

Fig. 1 Wheat yield response to different P sources and rates. Note: MAP + AS + ZnSO₄ was only tested at 60 lbs P₂O₅ /ac.

Grain P Concentration
Grain S Concentration
Grain Zn Concentration


At 60 lbs P₂O₅/ac, MicroEssentials® 4.2 bu/ac (6.0%) higher yield than MAP and 2.5 bu/ac (3.5%) higher yield than the MAP blend

The 30 lbs P₂O₅/ac of MicroEssentials® SZ® outperformed the 60 lbs P₂O₅/ac rate of MAP and the MAP blend. This demonstrates the increased P efficiency of MicroEssentials® SZ® compared to MAP.

Grain nutrient concentrations were higher in MicroEssentials® SZ® treatments than MAP or MAP blend treatments. Compared to MAP, MicroEssentials® SZ® demonstrated the following increases: 3.8% for P, 4.1% for S and 2.4% for Zn.

MicroEssentials® SZ® demonstrated higher yield and grain nutrient concentration compared to MAP or a MAP blend. Applying MicroEssentials® SZ® results in maximum yield and increased nutrient efficiency.

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Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible.