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Abstract

 

This article in AJ

  1. Vol. 103 No. 5, p. 1366-1371
     
    Received: Apr 28, 2011


    * Corresponding author(s): wjc3@cornell.edu
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doi:10.2134/agronj2011.0129

Location, Variety, and Seeding Rate Interactions with Soybean Seed-Applied Insecticide/Fungicides

  1. William J. Cox * and
  2. Jerome H. Cherney
  1. Dep. of Crop and Soil Sci. Dep., Bradfield Hall, Cornell Univ., Ithaca NY 14853

Abstract

Cool conditions after soybean [Glycine max (L.) Merr.] planting may increase soil pest incidence and reduce emergence. Field-scale studies were conducted in 2009 and 2010 at three locations in New York on two varieties at four seeding rates (272,000, 346,000, 420,000, and 490,000 seeds ha−1) with and without seed-applied insecticide/fungicides to determine if treated seed enhances plant establishment, allowing for lower seeding rates for maximum yield and partial return. Plant density and yield had location × variety × seed treatment interactions. A treated vs. untreated Asgrow variety had 16 to 22% plant density increases and 4% yield increases at two locations, whereas a Pioneer variety had a 16% density increase at one location but no yield increases. At a third location, the treated vs. untreated Pioneer variety had 19 and 4% increases, respectively, whereas the Asgrow variety had no increases. Yield, which had no seeding rate × seed treatment interaction, had quadratic responses to seeding rate and early plant densities (maximum yield at 478,300 seeds and 295,300 plants ha−1, respectively). Partial return, which had a seeding rate × seed treatment interaction, had quadratic responses to seeding rate with maximum values at 398,800 and 341,800 seeds ha−1 for untreated and treated seed, respectively. Maximum partial returns at these seeding rates ($1241–1245 ha−1, respectively) were similar because seed treatment cost offset lower seed cost. Maximum partial return occurred at early plant densities of 248,400 plants ha−1, but the variety × location × seed treatment interaction complicates selecting seeding rates for this plant density.

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Copyright © 2011. Copyright © 2011 by the American Society of Agronomy, Inc.