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This article in AJ

  1. Vol. 105 No. 6, p. 1853-1859
     
    Received: Mar 25, 2013
    Published: October 4, 2013


    * Corresponding author(s): clmain@dow.com
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doi:10.2134/agronj2013.0154

Effects of Nitrogen and Planting Seed Size on Cotton Growth, Development, and Yield

  1. Christopher L. Main *a,
  2. L. Tomas Barberb,
  3. Randall K. Bomanc,
  4. Kent Chapmand,
  5. Darrin M. Doddse,
  6. Stu Duncanf,
  7. Keith L. Edmisteng,
  8. Patrick Hornd,
  9. Michael A. Jonesh,
  10. Gaylon D. Morgani,
  11. E. Randall Nortonj,
  12. Shane Osbornec,
  13. Jared R. Whitakerk,
  14. Robert L. Nicholsl and
  15. Kevin F. Bronsonm
  1. a formerly Univ. of Tennessee, currently Dow AgroSciences 120 Hidden Creek Cv., Medina, TN 38355
    b Univ. of Arkansas, 2301 South University Ave., Little Rock, AR 72203
    c Oklahoma State Univ., 16721 U.S. Hwy 283, Altus, OK 73521
    d North Texas State Univ., 1155 Union Circle, Denton, TX 76203
    e Mississippi State Univ., Box 955 Mississippi State, MS 39762
    f Kansas State Univ., 1007 Throckmorton Hall, Manhattan, KS 66506
    g North Carolina State Univ., 4208 Williams Hall, Raleigh, NC 27695
    h Clemson Univ., 2200 Pocket Rd., Florence, SC 29506
    i Texas A&M Univ., 2474 TAMUS, College Station, TX 77843
    j Univ. of Arizona, 2134 S. Montierth Lane, Safford, AZ 85548
    k Univ. of Georgia, P.O. Box 8112, Statesboro, GA 30460
    l Cotton Incorporated, 6399 Weston Parkway, Cary, NC 27513
    m U.S. Arid Land Agric. Res. Center, USDA-ARS, 21881 N. Cardon Lane, Maricopa, AZ 85138.

Abstract

A standardized experiment was conducted during 2009 and 2010 at 20 location-years across U.S. cotton (Gossypium hirsutum L.)-producing states to compare the N use requirement of contemporary cotton cultivars based on their planting seed size. Treatments consisted of three cotton varieties with planting seed of different numbers of seed per kg and N rates of 0, 45, 90, and 134 kg ha–1. Soil at each trial location was sampled and tested for nitrate presence. High levels of soil nitrate (>91 N-NO3 kg ha–1) were found in Arizona and western Texas, and soil nitrate in the range of 45 to 73 kg N-NO3 ha–1 was found at locations in the central United States. Cotton lint yield responded to applied N at 11 of 20 locations. Considering only sites that responded to applied N, highest lint yields were achieved with 112 to 224 kg ha–1of applied plus pre-plant residual soil NO3—translating to an optimal N requirement of 23 kg ha–1 per 218 kg bale of lint produced. Among the varieties tested those with medium-sized seed produced higher yields in response to N than did larger and smaller seeded varieties. Varieties with larger seed had longer and stronger fibers, higher fiber length uniformity than small seeded varieties and decreased micronaire. Seed protein and oil increased and decreased slightly in response to increasing amounts of soil nitrate plus applied N, respectively.

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Copyright © 2013. Copyright © 2013 by the American Society of Agronomy, Inc.