Nitrogen Application Timing Across Different Corn Products

Trial Objective:

  • 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.
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