November 22, 2019
- place Update
There is considerable interest in applying nitrogen (N) later in the growing season; therefore, farmers and agronomists want to know the best time to sidedress N for a later-season application.
Nitrogen is a major investment in corn production and knowing when corn plants are most responsive to a N application can help farmers determine the optimal application time for the highest return on their investment.
The Bayer Learning Center at Monmouth, IL has been conducting trials over the past four years to evaluate the impact of N sidedress timing.
| 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 | 36.000 |
A 114 RM SmartStax® RIB Complete® corn blend product was utilized in the trial.
Nitrogen in the form of 32% UAN (32-0-0) was used as the N source.
Figure 1. Average corn yield for 2019 and the four-year average for nitrogen sidedress application timing at the V4, V8, or V12/VT growth stage.
This result may have been due to the cold and wet conditions this spring limiting residue decomposition prior to planting. When temperatures increased after planting, rapid residue decomposition may have reduced N availability for the plants during the early season, as microbes utilize soil N as they decompose the residue.
At this location, front-loading the N application resulted in higher average yields over the past four years.
Including 360 Y-DROP® facilitated timing flexibility and later application of N in taller corn.
The ideal timing of later-season N applications can change from year to year due to weather and environmental conditions.
The presence of residue from the previous crop can interact with N management practices and yield potential.
Individual hybrids may respond differently to N application timing. Consult your local Field Sales Representative or Technical Agronomist for recommendations.
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