Double-crop soybean management practices for high yield and profitability

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Double-crop soybean[Glycine max (L.) Merr.] production in Kentucky involves planting soybean after soft red winter wheat (Triticum aestivum L.) harvest during June and July. Double-crop soybean yields are lower than full-season soybean yield planted earlier in the spring. This research aimed to determine the effect of seeding rate, seed treatment, and applying foliar fungicide and insecticide at the R3 growth stage at two planting timings on double-crop soybean seed yield, yield components, and seed quality. Field trials were established in Princeton, KY, in 2017, 2018, and 2019 after wheat harvest. Planting double-crop soybean early, after wheat was harvested at 20 to 22% grain moisture, resulted in increased seed yield, seeds ft–2, and protein concentration compared with double-crop soybean planted later. A seeding rate of 225,000 seeds acre–1 resulted in increased seed yield, seeds ft–2, and seed protein concentration compared with 150,000 seeds acre–1. A seed treatment including fungicides and an insecticide did not impact seed yield, yield components, or seed protein or oil concentration compared with no seed treatment. Applying a prophylactic foliar fungicide and insecticide treatment at the R3 growth stage increased seed yield and seed mass compared with an economic threshold application. In addition, the most intensive management (225,000 seeds acre–1, seed treatment, and prophylactic fungicide and insecticide) yielded ∼25% more than the base treatment and had more seeds ft–2. The results are the first to indicate the potential for intensive management practices to increase double-crop soybean productivity in Kentucky.

Original languageEnglish
Article numbere20119
JournalCrop, Forage and Turfgrass Management
Issue number2
StatePublished - 2021

Bibliographical note

Funding Information:
The authors thank Conner Raymond, Curtis Bradley, Hunter Adams, Jacob Foote, Gracie Harper, Carrie Ann Followell, Mary Grace Jackson, Bradley James, Kelly Eichler, and Baily Webster for their help with this project. Special thanks are due to the Kentucky Soybean Promotion Board for providing funding for the project. This publication is in partial fulfillment of the requirements of K.S. Rod for obtaining a Ph.D. from the University of Kentucky.

Publisher Copyright:
© 2021 The Authors. Crop, Forage & Turfgrass Management published by Wiley Periodicals LLC on behalf of American Society of Agronomy and Crop Science Society of America

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science
  • Plant Science


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