Effects of Corn Seed Placement on Yield Potential

TRIAL OBJECTIVE

  • Demonstrations at the Bayer Learning Center at Scott, Mississippi in 2018 and 2019 showed comparable yield potential for broadcast soybean production to plantings with 38-inch single, 38-inch twin, and 30-inch single row spacing. 

  • Wet conditions delayed corn planting in 2019, which led to growers asking the question-– Can I broadcast seed corn when I am pushed for time at planting? 

  • This demonstration was conducted to quantify the effect of precision corn seed placement with row-planted systems versus a broadcast planting technique. 

  • This study attempts to demonstrate the potential of using an alternative planting technique, like broadcast planting corn, in difficult planting conditions.  

 

RESEARCH SITE DETAILS

Location Scott, MS    
Soil Type Clay Silt loam  

Previous
 Crop
Soybean    
Tillage 
Type

Conventional


 
Planting Date 05/22/20    
Harvest Date 09/18/20  

Potential Yield
 (bu/acre)
200    
Seeding Rate
(seeds/acre)

36K


 

 

  • All cultural inputs (insect, weed and disease management) were per the local standards for the area with 240 lb/acre of liquid N applied early in-season via a soil application.
    • Four DEKALB® corn products were planted:
      • DKC64-35, VT Double PRO®, 114 Relative maturity
      • DKC66-18, VT Double PRO®, 116 Relative maturity
      • DKC67-44, VT Double PRO®, 117 Relative maturity
      • DKC70-27, VT Double PRO®, 120 Relative maturity
  • Treatments
    • Row-planted system: 36000 seeds per acre were planted using precision corn planting equipment at two different depths: 
      • ½-inch
      • 2-inch
    • Broadcast system: 36000 seeds per acre by weight were planted using a fertilizer spreader. This was determined by the seeds per pound listed on the seed bag and the land area to be seeded.
  • Plots were planted as single replicate strip plots that were .10 acres each.
  • Data were corrected to 15.5% moisture for analysis.
  • This trial was planted late to simulate a delayed planting date situation and as such, the expected yield potential was lower than the typical expected yield for the area. 

 

 

UNDERSTANDING THE RESULTS

image Figure 1. Inconsistent corn emergence with broadcast seeding method.
image Figure 2. Height differences between seeding depth of ½-inch (left) and 2-inch depth (right).

 

  • Emergence
    • Precision system: typical uniform emergence to a stand of approximately 33000-34000 plants/acre.
    • Broadcast system: Extremely variable emergence to a stand in the range of 38000-60000 plants/acre due to difficulty in accurately applying seed to the field by weight (Figure 1).
  • Early Season
    • Precision system: The deeper planted (2 inches deep) appeared healthier throughout the season than either the broadcast or the ½-inch deep planted (Figure 2). 
    • Broadcast system: The broadcast corn was not uniform in appearance during the season and emerged at widely varying times for about 4 weeks post planting.  

 

 
image Figure 3. Average yield of all corn products and planting treatments, including average yield off all corn products across each planting treatment.

  • Harvest
    • Precision system: We observed a 27 bu/acre average yield increase across all corn products in this demonstration for the 2-inch deep planted corn when compared to the ½-inch deep corn.
    • Broadcast system: We observed a 56 bu/acre average increase in the 2-inch deep planted system compared to the broadcast planted corn.

 

KEY LEARNINGS

  • For this demonstration, precise seed placement and deeper seeding depths had a positive influence on corn yield potential. These parameters can only be established at planting.

  • Under the late planting conditions at SLC, broadcast planting of corn is not recommended, and taking the time to precision plant corn increased yield potential.

 
 
 

3013_R13_20

 

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