Planting Date and Seeding Rate Effects on Soybean Yield in Kentucky


  • Evaluate the effect of planting date and seeding rate on yield, height and lodging of Pioneer® brand soybean varieties grown on productive soils near Owensboro, Ky.

Study Description

Plot Layout:      4 rows, 30 feet long
Experimental Design:      RCBD, 4 replications
Number of Locations:      1
  • Planting Date:
Late May
  • Seeding Rate:
     120,000 seeds/acre
180,000 seeds/acre
  • Pioneer® Brand Soybeans Variety/Brand¹:
    92Y83 (RR)    MG 2.8       93Y05 (RR)    MG 3.0
    P35T58R (RR)    MG 3.5       93Y84 (RR)    MG 3.8
    93Y92 (RR)    MG 3.9       94Y23 (RR)    MG 4.2
    94Y50 (RR)    MG 4.5       94Y70 (RR)    MG 4.7
    P49T97R (RR)    MG 4.9       95Y70 (RR)    MG 5.1


  • Average soybean yield was 8 bu/acre greater at a seeding rate of 180,000 seeds/acre compared to 120,000 seeds/acre.
  • Final stands of at least 85,000 plants/acre were generally required to produce maximum yields (data not shown).
  • Plant height was reduced and lodging scores generally improved with April plantings compared to May plantings.
  • MG 2.8 and 3.0 varieties favored mid-May planting.
  • Yields with all other varieties were maximized with April and mid-May plantings.
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Means with the same letter are not significantly different based on Tukey's HSD test conducted at the α=0.05 level.

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Bars at or above red dotted line are equivalent to the highest yielding treatment based on Tukey's HSD test conducted at the alpha=0.05 level.

PIONEER® brand products are sold subject to the terms and conditions of sale which are part of the labeling and purchase documents. Roundup Ready® is a registered trademark used under license from Monsanto Company. 2013 data are based on average of all comparisons made in one location through November 15, 2013. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary.