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This article in AJ

  1. Vol. 104 No. 6, p. 1672-1678
     
    Received: May 3, 2012
    Published: September 24, 2012


    * Corresponding author(s): noura.ziadi@agr.gc.ca
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doi:10.2134/agronj2012.0153

Growth of Corn Roots and Associated Arbuscular Mycorrhizae Are Affected by Long-Term Tillage and Phosphorus Fertilization

  1. Min Shenga,
  2. Roger Lalandea,
  3. Chantal Hamelb,
  4. Noura Ziadi *a and
  5. Yichao Shia
  1. a Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Quebec City, QC, Canada, G1V 2J3
    b Semiarid Prairie Agricultural Research Centre, Agriculture and Agri-Food Canada, Box 1030, Airport Rd., Swift Current, SK, S9H 3X2

Abstract

Phosphorus deficiency is a major constraint for corn (Zea mays L.) production. Cropping practices, such as tillage, modify corn P absorption, but the underlying mechanism must be assessed. A study was conducted at a long-term (18-yr) experimental site in Quebec, Canada, to evaluate the effects of tillage and P fertilization on arbuscular mycorrhizal (AM) fungi, soil properties, root attributes, corn growth, and corn P concentration. Soil (0–10 cm) and plant samples were collected at the 8 to 10 leaf stage from plots under moldboard plow (MP) and no till (NT) fertilized with 0, 17.5, or 35 kg P ha−1. Tillage increased soil bulk density, vesicular colonization, shoot and root biomass, root surface area, average diameter, volume, total root length density, and the percentage of medium-sized roots; it decreased total soil C and N concentrations, specific root length, percentage of fine roots, and arbuscular and total AM fungal colonization. Phosphorus fertilization reduced total AM fungal colonization, enhanced soil Mehlich-3 P level, total root length density, and the percentage of fine roots. Corn shoot and root P concentrations, reduced by tillage, were positively correlated with the percentage of fine roots and arbuscular colonization, but negatively correlated with vesicular colonization and the percentage of medium-sized roots. Overall, P fertilization reduced total AM fungal colonization and increased root length density, and tillage decreased arbuscular development in roots and fine root growth in soil resulting in the low corn P concentration.

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Copyright © 2012. Copyright © 2012 by the American Society of Agronomy, Inc.