Corn Product Response to Nitrogen Stress

TRIAL OBJECTIVE

 

  • The objective of this study was to characterize the yield response and harvest appearance of different corn products to nitrogen (N) stress.  

 

RESEARCH SITE DETAILS

  • Sixteen DEKALB® corn brand blends were used in this study, an early relative maturity (RM) set (97-113 RM) and a late RM set (108-115 RM).

  • The trial was set up as a split-plot design at each location with N rate as the blocking factor with 2 replications.

  • Plot size was 4 rows at 30-inch row width, 35 feet long, and the center rows were harvested for data.

  • Planting dates were near normal in the southern part of the state while slightly delayed across Northern Iowa.

  • Nitrogen was applied before V3 stage. See the table above for N rates.

 

UNDERSTANDING THE RESULTS

 

  • Yield differences between products when grouped at the low N rate were not different statistically. The same was true of the high N rate. 

  • Products displayed N deficiency symptoms at the low N rate during most of the season.

  • Yield differences within N rates can be attributed to germplasm by environmental interactions.

  • Physical plant integrity i.e. harvest appearance of products at the high N rate aligned with the product guide rating. However, harvest appearance was slightly worse for products at the low N rate. 

KEY LEARNINGS

 

  • This study could not confirm that there are differences in product sensitivity to either a yield-limiting low N rate or a crop-sufficient high N rate. 

  • This study suggests products have similar response to N rate; however, supplying adequate N and monitoring N losses is important for the best return on investment.

  • Understand that environmental conditions such as seasonal rainfall, soil type, and temperature that can affect crop-available nitrogen. 



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