February 2014

MicroEssentials® SZ® Rice Zinc Study


Evaluate the yield response of MicroEssentials® SZ® (12-40-0-10S-1Zn) compared to a blend of DAP (18-46-0) + AS (21-0-0-24S) + ZnSO₄ (0-0-0-16.5S-36Zn) applied at different zinc rates.


  • Zinc (Zn) deficiency is the most widespread micronutrient disorder in rice (Oryza sativa). Zn deficiency causes multiple symptoms that usually appear two to three weeks after planting. Plants lacking zinc remain stunted and in severe cases may die. Plants that survive may show substantial delay in maturity and reduction in yield (Figure A and B).

  • Rice is very responsive to Zn application; therefore, it is critical to evaluate the effect of Zn application rates on rice yield.

  • DAP + AS + ZnSO₄ is often used as a fertilizer blend applied to rice.


Crop: Rice (Oryza sativa)

Year: 2011-2012

Locations: 6 trials across rice-growing regions of the U.S. (AR, LA, MS).

Experimental Design: Small-plot RCBD with 4 replications.

Data Source: Field studies conducted by University of Arkansas, Louisana State University and Mississippi State University.

Experimental Design: Small-plot RCBD with 4 replications.

Cropping Conditions: All trials conformed to local cropping practices.

P Rate: 80 lbs P₂O₅/ac

S Rate: 20 lbs S/ac balanced across treatments

Zn Rate: MicroEssentials® SZ® was applied at 2 lbs Zn/ac; DAP + AS + ZnSO₄ was applied at 5 different Zn rates (0, 2, 5, 8, 10 lbs Zn/ac).

Application Timing and Method: Preplant broadcast


Rice Yield at Varying Zinc Rates


  • Rice yields increased with higher rates of zinc.

  • MicroEssentials® SZ® at 2 lbs Zn/ac demonstrated a 0.9 bu/ac higher yield than a DAP blend at 5 lbs Zn/ac. This zinc rate was 2.5 times greater than MicroEssentials® SZ®.

  • Rice yield for MicroEssentials® SZ® at 2 lbs/ac Zn is statistically similar to the DAP + AS + ZnSO₄ blends applied at 5, 8 and 10 lbs Zn/ac.

  • MicroEssentials® SZ® contains N, P, S and Zn fused into one nutritionally balanced granule providing uniform nutrient distribution, increased nutrient uptake and season-long sulfur availability.

©2020 The Mosaic Company. All rights reserved. AgriFacts, MicroEssentials, SZ, Fusion, Aspire and NutriForm are registered trademarks of The Mosaic Company.

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.