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This article in AJ

  1. Vol. 96 No. 1, p. 275-280
     
    Received: Mar 3, 2003
    Published: Jan, 2004


    * Corresponding author(s): bdeen@uoguelph.ca
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doi:10.2134/agronj2004.2750

Within-Row Plant Spacing Variability Does Not Affect Corn Yield

  1. Weidong Liua,
  2. Matthijs Tollenaara,
  3. Greg Stewartb and
  4. William Deen *a
  1. a Dep. of Plant Agric., Univ. of Guelph, Guelph, ON, Canada N1G 2W1
    b Ontario Ministry of Agric. and Food, Crop Science Bldg., Univ. of Guelph, Guelph, ON, Canada N1G 3E1

Abstract

Nonuniform plant spacing within the row in corn (Zea mays L.) may reduce grain yield. To investigate the response of corn to plant spacing variability, experiments were conducted at two locations in south-central Ontario during 2000 and 2001. Six plant spacing treatments, 6.7 to 16.2 cm in standard deviations (SD), were established by planting Roundup Ready corn with increasing proportions of conventional corn seeds and then removing the conventional corn using glyphosate before three-leaf stage. Using SD as well as short gap, long gap, double, and cluster as an index of plant spacing variability, effects of plant spacing variability on corn growth and grain yield were investigated. Averaged across locations and years, grain yield was not significantly affected by plant spacing variability. Plant spacing variability also had no significant effect on leaf number, plant height, leaf area index, and harvest index. There were no correlations between plant spacing variability and stalk lodging and barren or double ears. The lack of strong correlations among plant growth, grain yield, and plant spacing variability indicates that spacing uniformity within the range used in this study is not a significant factor in determining grain yield under commercial conditions and common plant densities used in Ontario.

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