Effects of Corn Product, Population, and Row Width on Yield

Introduction

13;10;
Figure 1

Figure 1. Effect of Seeding Rate and Corn Product in Twin Rows

13;10;

Over time, optimum planting populations have been increasing steadily. This leads to decreased space and increased competition between individual plants within the row. Narrower row spacing may be able to alleviate some of this increased competition stress.

13;10;

As recommended plant populations increase, narrow row widths become more desirable for several reasons:

13;10;
  • Less in-row crowding from neighboring plants
  • 13;10;
  • Increased soil shading
  • 13;10;
  • Reduced weed competition
  • 13;10;
  • Same planting equipment for corn and soybean
13;10;
Figure 2

Figure 2. Effect of Seeding Rate and Corn Product in 30-inch rows.

13;10;

Yield penalties are not associated with narrow row widths.1 In northern states, a yield response is generally expected from using narrow rows, likely due to a shorter growing season.1 Seeding rate is often a decision based on the range specified for individual corn products. Therefore, a corn product and population interaction could occur when comparing row width configurations. The purpose of this trial is to observe if there is a yield response to row spacing and populations for different corn products.

13;10;

Materials and Methods

13;10;
Figure 3

Figure 3. Effect of Seeding Rate and Corn Product in 20-inch rows.

13;10;

Corn Products

13;10;
  • 105 day Genuity® SmartStax® RIB Complete® corn blend
  • 13;10;
  • 113 day Genuity® SmartStax® RIB Complete® corn blend
  • 13;10;
  • 112 day Genuity® VT Triple PRO® RIB Complete® corn blend
13;10;

Seeding Rates (seeds per acre)

13;10;
Figure 4 
13;10;
  • 27,000
  • 13;10;
  • 35,000
  • 13;10;
  • 42,000
13;10;

Row Configurations

13;10;
Figure 5 
13;10;
  • 20-inch
  • 13;10;
  • 30-inch
  • 13;10;
  • Twin row
13;10;

Plot Design

13;10;
Figure 6 
13;10;

Each corn product was planted at each population in each row width.

13;10;
  • 3x3x3: 3 corn products by 3 seeding rates by 3 row configurations
13;10;

Plots were planted on May 7, 2014. Soil was previously planted to soybean, and received conventional tillage with chisel plow in the fall and soil finisher in the spring. Crop was harvested October 7, 2014.

13;10;

Key Messages

13;10;
  • Data from this demonstration supports that each corn product had a unique response to population and row spacing. Additional studies are needed to look at narrow row planting in corn to determine which plant population and row configuration is the best fit for each corn product in an area.
  • 13;10;
  • In the 2014 demonstration, twin rows were the highest yielding row configuration; however, in past studies at the Monmouth Learning Center, results have been inconsistent with respect to twin rows.
  • 13;10;
  • Local seed brand representatives may be the best source for local recommendations on plant population and row spacing for individual corn products.
13;10;View other demonstration summaries from the Monmouth Learning Center here.
    13;10;

    13;10;

    Discover the optimal planting rate for your selected seed products and maximize their performance in your field.