Nitrogen Application Timing Across Different Corn Products
Nitrogen is a substantial input cost in corn production. Knowledge of corn product response to nitrogen application timing can assist farmers in being more effective with input dollars.
The objective of this study was to determine if a relationship exists between nitrogen application timing and yield of corn products.
Research Site Details
Fifteen corn products ranging from 108 to 116 relative maturity (RM) were planted at 36,000 seeds/acre on May 8th.
Nitrogen in the form of 32% urea and ammonium nitrate (UAN) (32-0-0) was used.
Two nitrogen strategies were used:
Prior to planting 180 lb/acre of 32% UAN was applied and incorporated
Prior to planting 140 lb/acre of 32% UAN was applied and incorporated followed by 40 lb/acre of 32% UAN with a urease inhibitor side dressed at the V6 growth stage • Two replications of each treatment were used. Understanding the Results.
The split application of nitrogen provided a yield increase over a single application across all products tested. The increase in yield ranged from just over 5 bu/acre to 38 bu/acre.
What Does This Mean for Your Farm?
In 2018, nitrogen was a limiting factor for corn yield in Monmouth, IL. This was most likely due to delayed residue breakdown in the spring and a lack of rain in June and July.
In 2018, most corn products showed a response to a split application of nitrogen.
Individual products may respond differently to the timing of nitrogen application. Consult your local DSM or Technical Agronomist for recommendations.
Consider all local costs when making nitrogen management decisions.