DEKALB Corn Product Yield Response to Planting Rate in an Irrigated Environment - Coastal East

Trial OverView

This trial was created to help understand the yield response of new DEKALB® corn products to planting rate and to begin to develop planting rate response data in the absence of GEN V testing for this area.

Research Objective

The objective of the experiment was to evaluate the agronomic and yield response of three newly released DEKALB® corn products to five different planting rates.

Location Soil Previous
Crop
Tillage Planting
Date
Harvest
Date
Potential
Yield/Acre
Planting
Rate/Acre
Multiple
Locations
in Georgia

Multiple Multiple Minimum
Tillage
Multiple Multiple Multiple 28,000 seeds
31,000 seeds
34,000 seeds
37,000 seeds
40,000 seeds

SITE NOTES:

  • Nine on-farm locations and three Regional Technology Centers (RTC's)in Georgia were used for this study.
  • Each location was of diverse soil type, yield potential, and managed per the cooperators agronomic production practices.
  • Treatments included three different DEKALB® Brand corn products: DKC64-35, DKC67-44, and DKC70-27 brands planted at five different planting rates: 21,000, 24,000, 27,000, 30,000, and 33,000 seeds/acre.

Understanding the Results

 

Figure 1. Average corn yield (bu/acre) of DKC64-35 brand across all locations, in low yield environments, and high yield environments.

 

Figure 2. Average corn yield (bu/acre) of DKC67-44 brand across all locations, in low yield environments, and high yield environments.

 

Figure 3. Average corn yield (bu/acre) of DKC70-27 brand across all locations, in low yield environments, and high yield environments.

Understanding the Results

  • Net return is based on gross profit of $4.00 per bushel less the retail cost of the seed.
  • Half of the trial locations had yield environments of greater than 215 bushels per acre.
  • For this trial, DKC64-35 brand had the highest net return at a planting rate of 31,000 seeds/acre in all yield environments tested.
  • DKC67-44 brand had the highest net return at a planting rate of 34,000 seeds/acre in all yield environments tested. Stalk strength on DKC67-44 brand should be considered on rows that are at least 36-inches wide, and at populations of 34,000 seeds/acre or higher. Narrow rows of 30-inches or less can support higher populations.
  • DKC70-27 brand had the highest net return at a planting rate of 37,000 seeds/acre in high yield environments and 31,000 seeds/acre in low yield environments.
  • What Does this mean for your Farm?

  • When selecting a corn product, it is important to understand corn product response to planting rate to gain the most optimal net return.