The Effects of Row Spacing and Plant Population on Corn Yield Potential

Trial Overview

13;10;
  • This13;10;trial was designed to provide customers in southern Iowa with helpful row width13;10;comparison information, which is often limited. The trial will help determine13;10;if higher than average plant populations are beneficial within each row width13;10;system. 
13;10;
13;10;

Research Objective

13;10;
  • This13;10;study compared corn yield potential in 20- and 30-inch row spacing systems and13;10;examined the effect of higher plant populations on corn yield potential within13;10;each row spacing.
13;10;
13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;13;10;
13;10;Location 13;10;
13;10;Soil Type 13;10;
13;10;Previous Crop 13;10;
13;10;Tillage Type 13;10;
13;10;Planting Date 13;10;
13;10;Harvest Date 13;10;
13;10;Potential Yield 13;10;
13;10;Planting Rate 13;10;
Victor, IA
Silty clay loam
Soybean
Conventional
04/24/2016
10/07/2016
220-260 bu/acre
13;10;

13;10; Site Notes:13;10;

13;10;
Seven DEKALB® brand corn products of 108 to 11413;10;relative maturity were planted in adjacent blocks at two different row13;10;spacings and at two different planting populations within each row spacing:
     - 20-inch row spacing planted at 38,000 seeds/acre (38K) and 42,000 seeds/acre (42K) 
13;10;
     - 30-inch row spacing planted at 34,000 seeds/acre13;10;(34K) and 38,000 seeds/acre (38K)
13;10;
     - The lower population is considered a local13;10;average planting population for the particular row spacing system. The higher13;10;population is expected to show an incremental difference in yield.
13;10;A variable row spacing Case IH 1215 Early Riser®13;10;planter unit was used for all plantings at general planting depth settings. All plots received 145 lbs/acre anhydrous13;10;ammonia in the spring with cultural practices being identical.   Plots consisted of six, 30-inch rows, each approximately13;10;570 feet long.
13;10;

13;10;
13;10;

Understanding the Results

13;10;
 
Table 1. Yields of DEKALB® Corn Brand Blends at Each Row13;10;Spacing and Planting Population
13;10;
 
Figure 1. Corn Yields by Row Spacing and Planting13;10;Population across All Products
13;10;
13;10;
  • For the 20-inch row spacing, the higher planting13;10;population of 42,000 seeds/acre produced higher yields on average across products.
  • 13;10;
  • For the 30-inch row spacing, there was little13;10;difference in yield on average between the two planting rates across products.
  • 13;10;
  • At the 38,000 seeds/acre planting rate, the13;10;30-inch row spacing produced a consistent advantage over 20-inch row spacing across13;10;all products.
  • 13;10;
  • During this single-site, non-replicated trail,13;10;the 30-inch row spacing produced greater yields than the 20-inch rows with13;10;these corn products.
13;10;
13;10;

What Does This Mean for Your Farm

13;10;
  • The yield response to row spacing and plant population may vary depending on many factors such as weather, plant genetics,13;10;soil fertility, and others.  
  • 13;10;
  • This study represents a single-site,13;10;non-replicated demonstration. Further studies on plant population and row13;10;spacing will help farmers make informed decisions.
13;10;
13;10;

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