Corn Product Response to Nitrogen

Trial Overview

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  • Different corn products may13;10;have different responses to extra applied nitrogen (N).  An understanding of how each new corn product13;10;responds to extra N can help to maximize a grower’s return on investment and13;10;profitability.
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Research Objective

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  • Determine the yield13;10;response of five new DEKALB® corn brand products to extra N fertilizer applied13;10;at the V6 growth stage. 
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13;10;Location 13;10;
13;10;Soil Type 13;10;
13;10;Previous Crop 13;10;
13;10;Tillage Type 13;10;
13;10;Planting Date 13;10;
13;10;Harvest Date 13;10;
13;10;Potential Yield 13;10;
13;10;Planting Rate 13;10;
Mingo, KS
Silt Loam
Sunflowers
Strip-Till
05/07/2016
10/11/2016
250
34,000
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13;10; Site Notes:13;10;

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Nitrogen (N) was applied in the spring at approximately 200 lbs. of13;10;available N/acre in the soil and an additional 70 lbs. of N/acre was13;10;side-dressed at the V6 corn growth stage on half of the trial area.The trial was planted under center pivot irrigation and 32-0-0 UAN liquid13;10;N fertilizer was applied with a knife applicator at the V6 growth stage.  The knife applicator was ran without applying13;10;N in the spring only applied N block to avoid any advantageous effects of13;10;opening up the soil surface.Profit or loss of applying extra N was determined using an extra13;10;application cost of $31.50 and a corn selling price of $2.74 per bushel.The same trial was replicated at another location, but lost due to hail. 
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Understanding the Results

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  • A hail storm at the R1 corn growth stage resulted13;10;in a 30% defoliation which may have limited the top-end yield potential and13;10;caused early maturation of the fuller-season corn products.  As a result, only the products with a13;10;relative maturity of 110 and below (DKC51-38RIB, DKC56-45RIB, and DKC60-87RIB13;10;brand blends) may have been showing a potential yield advantage with additional13;10;N (Figure 1). 
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  • DKC56-45RIB brand blend was the only product to13;10;show a profit by side-dressing extra N at the V6 corn growth stage (Figure 2). 
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What Does This Mean for Your Farm

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  • In a year without yield limiting factors, corn13;10;products should show a greater response to extra N.
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  • Low commodity corn prices can limit the13;10;profitability of applying extra N.
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  • It is important to match your N rates each year according13;10;to your yield potential and goals.
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  • Each corn product may respond differently to13;10;applying extra N.  Monsanto plans to13;10;continue this research in the future to provide better N recommendations for13;10;specific corn products.
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