DroughtGard® Hybrids Corn Product Performance by Population Density

Trial Overview

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  • In geographies where corn production is limited by water availability, products that can produce high yields while using water efficiently are in high demand. DroughtGard® Hybrids corn products are the result of a combination of traditional breeding and trait technology and are well suited for areas prone to high levels of water stress and drought, such as areas of the great plains including Kansas, Texas, and Nebraska. These products may also be beneficial in areas with traditionally high yielding environments where water is typically not the most limiting factor, particularly when unexpected drought conditions arise. The effect of population density on yield in expanded geographies will influence management decisions on a field-by-field basis.
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Research Objective

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  • Determine how DroughtGard® Hybrids corn products perform in expanded geographies of Iowa.
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  • Evaluate the effects of planting population on the yield of DroughtGard® Hybrids corn products.
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Location
Soil Type
Previous Crop
Tillage Type
Planting Date
Harvest Date
Potential Yield
Planting Rate
Huxley, IA
Nicollet loam/ Webster clay loam
Soybean
Conventional
04/17/2016
10/18/2016
250 bu/acre
32K, 36K, 40K
Percival, IA
Haynie silt loam
Soybean
Conventional
04/15/2016
09/21/2016
250 bu/acre
32K, 36K, 40K
Victor, IA
Mahaska silty clay loam
Soybean
Conventional
04/23/2016
10/04/2016
250 bu/acre
32K, 36K, 40K
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Site Notes:

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Weed management: Standard pre- and post-emergent herbicides were appliedSpacing: 30-inch rowsProduct: 107-114 relative maturity DroughtGard® Hybrids with VT Double PRO® RIB Complete® corn blend products were evaluatedTreatments: Planting populations used were 32,000 (32K), 36,000 (36K), and 40,000 (40K) seeds/acre
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Understanding the Results

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Figure 1. Effect of three planting populations on the yield of DroughtGard® Hybrids corn products at three Iowa locations
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  • In general, greater performance was seen in planting populations exceeding 32K seeds/acre. The highest planting population (40K) out-performed the lowest planting population (32K) by 12 bu/acre and the mid population (36K) by 4 bu/acre.
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  • Variation by individual corn products was observed but yield remained above 220 bu/acre in all cases.
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What Does This Mean for Your Farm

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  • Are DroughtGard® Hybrids corn products a good fit for your geography?
         - Even at planting populations considered to be low for the study area, the products evaluated yielded 229 bu/acre on average and up to 255 bu/acre at the highest planting population of 40K seeds/acre.
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         - Selecting DroughtGard® Hybrids corn products may protect yield in years with unpredictable rainfall, and still deliver consistent yield in years where rainfall is not a factor (such as the study year).
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  • What planting populations are appropriate when planting DroughtGard® Hybrids corn products?
         - Individual products respond differently to variable populations and it is important to consider unique conditions when selecting products and determining what populations are right for your operation. 
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