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This article in AJ

  1. Vol. 103 No. 5, p. 1432-1440
     
    Received: Apr 8, 2011
    Published: Sept, 2011


    * Corresponding author(s): walter.riedell@ars.usda.gov
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doi:10.2134/agronj2011.0113

Nitrogen Fertilizer Management Effects on Soybean Nitrogen Components and Bean Leaf Beetle Populations

  1. Walter E. Riedell *,
  2. Shannon L. Osborne,
  3. Jon G. Lundgren and
  4. Joseph L. Pikul
  1. USDA-ARS, North Central Agricultural Research Lab., 2923 Medary Ave., Brookings, SD 57006

Abstract

Bean leaf beetle [Cerotoma trifurcata (Förster)] (BLB) larvae consume soybean [Glycine max (L.) Merr.] root nodules. This study was conducted to determine if different rates of N contained in starter fertilizer affect soybean shoot N components and BLB populations. The effects of starter N fertilizer treatments, consisting of 112 kg ha−1 of 24–16–11 (high-N treatment), 7–16–11 (intermediate-N), or 0–16–11 (no-N) percent elemental N–P–K, on soybean shoot NO3–N and ureide-N and on BLB larval and adult abundance and body size were investigated on a Barnes clay loam (fine-loamy, mixed, superactive, frigid Calcic Hapludolls) near Brookings, SD. High-N fertilizer increased shoot NO3–N from the beginning bloom to beginning pod stage and reduced ureide-N at the full bloom, beginning pod, and beginning seed stages when compared to the intermediate and no N treatments. Fertilizer N treatments had no effects on larval numbers or body size. High-N fertilizer resulted in greater adult emergence (1.73 insects m−1) than no N (0.42 insects m−1) in the hot and dry 2007 growing season, but not in the cooler and less-dry 2006 growing season. Across both years, adult hind tibia lengths, but not head capsule widths, were greater in insects that emerged from high-N (1.86 mm) and intermediate-N (1.85 mm) compared to no-N (1.79 mm) treatments. High-N starter fertilizer, which altered shoot N components and increased BLB adult numbers and size under hot and dry conditions, may increase BLB populations and intensify the damage caused by this insect pest.

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

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