• There is an interest in better understanding nitrogen (N) placement during sidedressing and the potential effect on N uptake and yield. 

  • Nitrogen is a substantial cost in corn production. Understanding the optimal placement of sidedressed N can help farmers determine the application method best suited for their operation. 



Location Monmouth, IL Planting Date 4/25/19
Soil Type Silt loam Harvest Date 10/9/19
Previous Crop Corn  Potential Yield (bu/acre) 250
Tillage Type Conventional Seeding Rate (seeds/acre) 36K
  • A 114-day RM SmartStax® RIB Complete® corn blend product was selected for this trial.

  • The form of N used for all treatments was 32-0-0 UAN.

  • 80 lb N/acre was applied prior to planting and incorporated.

  • 100 lb N/acre was sidedressed with a urease inhibitor. Two sidedressing methods were used on June 26, 2019 at the V6 growth stage. 

    • A rolling coulter applied N in the center of the row (Figure 1).
    • A 360 Y-DROP® system applied N next to the base of the plants (Figures 2 and 3).
  • This trial included four replications.

  • This trial has been conducted at the Bayer Learning Center at Monmouth, IL over the last four years (from 2016-2019). 

Figure 1. A rolling coulter applying N in the center of the row.
Figure 2. A 360 Y-DROP® system applying N next to the base of the plants.
Figure 3. The location (dark line next to the base of the plants) where the 360 Y-DROP® system applied N.


Figure 4. Average corn yield for N sidedressing placement in the center of the row with a coulter and next to the base of the plant with 360 Y-DROP® for 2019 and the four-year average.
  • At this location, no clear advantage to either N application method has been seen at V6.

  • This year at this location dry conditions followed application, but the data shows no effect with applying the N directly beside the row.  


  • The timing for a rolling coulter application can be limited due to the height of the corn crop.

  • 360 Y-DROP® can allow a wider application window for sidedressing later in the season.

  • Yield differences may not be economically feasible when all costs are considered. Consider all local costs when making N management decisions.

  • Individual corn products may have different responses to N application timing. Consult your local Field Sales Representative or Technical Agronomist for recommendations.