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This article in AJ

  1. Vol. 103 No. 3, p. 702-708
    Received: Jan 14, 2011

    * Corresponding author(s): arnold.bruns@ars.usda.gov
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Comparisons of Single-Row and Twin-Row Soybean Production in the Mid-South

  1. H. Arnold Bruns *
  1. USDA-ARS, Crop Production Systems Research Unit, 141 Experiment Station Rd., Stoneville, MS 38776


A Maturity Group (MG) IV and MG V soybean [Glycine max (L.) Merr.] cultivar were planted on beds in 102 cm single-rows or 25 cm twin-rows with 102 cm centers at 20, 30, 40, and 50 seeds m−2 in a Beulah fine sandy loam (coarse-loamy, mixed, active, thermic Typic Dysrudepts) in 2008, 2009, and 2010 and in Sharkey clay (very-fine, smectitic, thermic Chromic Epiaquerts) in 2009 and 2010 at Stoneville, MS. Despite furrow irrigation, drought and consistent maximum temperatures −32°C during 2010 reduced stands, yields, and seed weight at both sites. Twin-rows produced more plants than similar single-rows, which helped increase twin-rows yields compared to single-rows on the clay. Yields on the clay did not differ among seeding rates. Yields from twin-rows on the sandy loam were only greater than single-rows at 40 and 50 seeds m−2 for the MG IV cultivar and did not differ for the MG V. The MG IV cultivar tended to yield better than the MG V at both sites. The MG IV cultivar averaged 20 nodes plant−1 compared to 15 for the MG V. Both cultivars on the sandy loam average 59 pods plant−1, while the MG V cultivar produced 70 pods plant−1 vs. 63 pods plant−1 for the MG IV cultivar on the clay. Twin-rows did not produce more pods plant−1 Row type or seeding rate did not effect seed weight at either site. Seeds m−2were greater for the MG IV cultivar on the sandy loam and corresponded with yield, but not so on the clay.

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Copyright © 2011. American Society of AgronomyCopyright © 2011 by the American Society of Agronomy