Response of Two DEKALB® Corn Products to Row Spacing - Coastal East


Trial OverView

Southeastern growers often question what the optimal row spacing in corn is to maximize yield. Most growers in the southeast plant their crops with a 36-inch row spacing due to utilizing the same planter for cotton, corn and peanuts. The purpose of this research was to determine if corn yields could be increased by planting on narrower rows versus the standard 36-inch row pattern.

Research Objective

The objective of this experiment was to evaluate the response of two DEKALB® corn products planted at three different row spacings.

 Location Soil Previous Crop Tillage Type Planting Date Harvest Date Potential Yield/Acre Planting Rate/Acre
 Tifton, GA   Sandy   Loam  Peanut  Strip-Till  3/17/2017  8/25/2017  250 bu/acre  34,000


  • Treatments were planted at the Regional Technology Center (RTC) in Tifton, GA.
  • All agronomic practices were per local standards with fertility based on 250 bu/acre corn yields.
  • Treatments included:
    • Two DEKALB® Brand corn products:
      • DKC67-42 brand – Selected for flex ear type
      • DKC67-72 brand – Selected for semi-fixed ear type
    • Row spacings:
      • 36-inch single row
      • 30-inch single row
      • 20-inch single row
    • Plot sizes:
      • Six 36-inch rows, 150 feet
      • Eight 30-inch rows, 150 feet
      • Twelve 20-inch rows, 150 feet

Understanding the Results


Figure 1. Average corn yield (bu/acre) by corn product and row spacing.

What does this mean for your farm?

  • Based on the demonstration results at this location, corn yields can be increased on different row spacings, but it can be dependent on the corn product selected.
    • As row width narrowed, a yield increase was observed with DKC67-42 brand, conversely, a yield decrease was observed with DKC67-72 brand.
  • Keep in mind, these data are based off of a static population of 34,000 seeds/acre. Future research needs to be conducted to evaluate multiple corn products at varying populations and row spacings to help determine the yield response of different corn products to multiple row spacings.