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This article in AJ

  1. Vol. 103 No. 2, p. 297-303
    unlockOPEN ACCESS
     
    Received: Apr 23, 2010


    * Corresponding author(s): craig.bednarz@bayercropscience.com
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doi:10.2134/agronj2010.0185

Effects of Irrigation, Cultivar, and Plant Density on Cotton Within-Boll Fiber Quality

  1. Lu Fenga,
  2. Vinicius B. Bufonb,
  3. Cory I. Millsc,
  4. Eric Hequetd,
  5. James P. Bordovskyd,
  6. Wayne Keelingd,
  7. Randy Bomand and
  8. Craig W. Bednarz *d
  1. a Chinese Academy of Agricultural Sciences, Anyang, Henan 455000, China
    b Embrapa Cerrados, BR020 Km18, CP 08223, Planaltina-DF, 73310-970, Brazil
    c Texas Tech Univ., Box 42122, Lubbock, TX 79409
    d Texas AgriLife Research, 1102 East FM 1294, Lubbock, TX 79403

Abstract

This study was designed to determine how within-boll fiber quality of cotton (Gossypium hirsutum L.) is affected through irrigation, cultivar, and plant density management. Field experiments were conducted in 2006 and 2007 using two contemporary cultivars, arranged in a split-split plot design with two irrigation rates (6.33 and 4.32 mm d−1) as the main plot, plant density (79,071; 128,490; 197,677 plants ha−1) as the subplot, and cotton cultivar (FM9063B2RF and ST4554B2RF) as the subsubplot. Plants from 3 m of one row from each plot were hand harvested by fruiting position. First fruiting position bolls from main-stem nodes 9 and 14 were hand harvested by seed position and ginned separately for Advanced Fiber Information System (AFIS) fiber quality analysis. Increased irrigation generally increased fiber length and upper quartile length, and decreased fineness and maturity ratio. Irrigation effects were greater on fiber length and maturity ratio at seed positions close to the apex of the locule. Increased plant density reduced both fineness and maturity ratio. The cultivar FM9063B2RF produced longer, more mature, and finer fibers than the ST4554B2RF. The overall lowest fiber quality (i.e., shorter and less mature fibers) occurred at seed positions close to the apex of the locule. The superior fiber quality (i.e., longer and more mature fibers) was from the middle to the base of the locule. Abundant rainfall diminished the effects of irrigation on fiber quality.

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