Corn Product Response to Nitrogen Rate

TRIAL OBJECTIVE 

 

  • Nitrogen (N) is an expensive yet necessary input in corn systems. 

  • Proper N application rates can help maximize corn yield potential and efficiency while minimizing environmental and economic losses.  

  • Corn products may have different responses to additional N.  

  • This trial evaluated the yield response of eight DEKALB® corn products to N application rate.  

 

RESEARCH SITE DETAILS 

Location Monmouth, IL     
Soil Type  Silt Loam   

Previous
Crop
Soybean     
Tillage
Type
 

Conventional 


 
Planting Date 05/13/20    
Harvest Date 10/9/20  

Potential Yield
 (bu/acre)
250    
Seeding Rate
(seeds/acre)
36K

 

  • Treatments consisted of eight DEKALB corn products planted at 36,000 seeds/acre with three different N rates applied:
    • 0 lbs/acre
    • 120 lbs/acre
    • 240 lbs/acre
  • Nitrogen in the form of 32% urea and ammonium nitrate (UAN) (32-0-0) was applied preplant and incorporated.
  • Plots were harvested and adjusted to 15% moisture
  • There were three replications of each treatment.

 

UNDERSTANDING THE RESULTS 

Table 1. Average yield response and return of additional nitrogen ($/acre) by corn product and nitrogen treatment. Calculation assumes $3.53/bu corn market price and $.40/lb for N. Table 1. Average yield response and return of additional nitrogen ($/acre) by corn product and nitrogen treatment. Calculation assumes $3.53/bu corn market price and $.40/lb for N.
  • Response to N rate varied by corn product. 

  • When factoring in N cost, increasing N rate was not always profitable.  

 

KEY LEARNINGS 

  

  • Many factors, including product genetic background, soil type, weather, previous crop, tillage, etc., can influence the yield response and profitability potential of an N application.
  • It is important to consider yield goals and N cost when making management decisions.
  • Response to N can vary from year to year. Consult your local Field Sales Representative or Technical Agronomist for recommendations for your farm.
 
4010_R6_20

 

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