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.
