Interaction of Nitrogen Rate with Seeding Rate and Corn Product

Trial Objective:

  • Nitrogen is a significant input cost for corn production. Knowing if agronomic practices, such as seeding rates and nitrogen application rates, are influenced by the specific product can help farmers manage nitrogen costs more efficiently.
  • This study was conducted to determine if the response to nitrogen application rates and seeding rates are consistent across different corn products.

Research Site Details



  • Four corn products with relative maturities of 110, 112, 113, and 114 were planted at 35,000 and 45,000 seeds/acre.
  •  The nitrogen source used was 32% urea and ammonium nitrate (UAN) (32-0-0) applied before planting and incorporated at three different rates: 240, 60, and 0 lb/acre.
  • There were two replications for each treatment.

Understanding the Results

  • The response to nitrogen and seeding rates was consistent across the four corn products evaluated.
  • At the higher nitrogen rates, the 45,000 seeds/acre seeding rate showed a yield increase; however, in terms of profit, the additional seed costs need to be considered.
  • The response to nitrogen rate provided the largest yield increase when compared to seeding rate.




What Does This Mean For Your Farm?

  • Yields increased with increasing nitrogen rate across all corn products
  •  Higher populations take advantage of higher nitrogen rates.
  • Individual corn products have unique interactions between nitrogen rate and seeding rate. Consult your local DSM or Technical Agronomist for recommendations.
  • Increased inputs may not be economically feasible when all costs are considered.