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Crop Science Abstract -

Alleviation of Salinity Stress in Kentucky Bluegrass by Plant Growth Regulators and Iron


This article in CS

  1. Vol. 34 No. 1, p. 198-202
    Received: Feb 21, 1992

    * Corresponding author(s):
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  1. D. A. Nabati,
  2. R. E. Schmidt  and
  3. D. J. Parrish
  1. Dep. of Crop and Soil Environmental Sciences, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061-0404



In many areas, nonpotable water is relegated for turfgrass irrigation. This research is conducted to determine if exogenous applications of selected substances to turfgrass could reduce the effects of saline irrigation. Field and greenhouse experiments investigated the effect of seaweed extracts, triazole fungicides, and Fe on Kentucky bluegrass (Poa pratensis L. cv. Plush) grown under various levels of salinity. In Exp. 1, Kentucky bluegrass was treated with a proprietary seaweed extract (SE) at 38 L ha−1, propiconazole [1-{2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2yl}methyl -1-H-1,2,4-triazole] (PPC) at 1.8 L active ingredient (a.i.) ha−1, and chelated Fe (Na-diethylene-triamine-pentaacetate-chelated Fe) at 4.7 kg a.i. ha−1. In Exp. 2, treatments included SE at 56 L ha−1, and chelated Fe at 2.2 kg a.i. ha−1. Two weeks after treatment in both experiments, plugs taken from field plots were transplanted into 4-L metal containers. The transplanted plugs were watered with 0, 0.15, or 0.3 S m−1 NaCl solutions for 7 wk. As salinity increased, leaf water stress increased, and clipping dry weight and rooting decreased. All treatments, except Fe, enhanced growth under 0.15 S m−1 salinity water. Under the higher salinity, PPC enhanced foliage weight, and all treatments, except Fe, stimulated rooting. Propiconazole-treated plants had the strongest root system under the higher salinity. In Exp. 2, CPC was the most active chemical in enhancing rooting. Result indicate that selected materials have potential use for Kentucky bluegrass production in saline environments.

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