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This article in AJ

  1. Vol. 92 No. 6, p. 1248-1255
    Received: Sept 20, 1999

    * Corresponding author(s): mbroome@pss.msstate.edu
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Vegetation Control for No-Tillage Corn Planted into Warm-Season Perennial Species

  1. Malcolm L. Broome *a,
  2. Glover B. Tripletta and
  3. Clarence E. Watsonb
  1. a Plant and Soil Science Dep., Mississippi State Univ., Box 9555, Mississippi State, MS 39762 USA
    b Experimental Statistics and Plant and Soil Science Dep., Mississippi State Univ., Box 9555, Mississippi State, MS 39762 USA


The success of no-tillage corn (Zea mays L.) planted into sod in the Southeast depends on control of warm-season perennials. Preemergence (PRE) and postemergence (POST) herbicides were evaluated for control of warm-season perennial and annual species in no-tillage corn production. Vegetation spectrum differences at the various locations influenced both herbicide rate and timing of application required for 90% control by imazapyr {(±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acid}, imazethapyr {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1 H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid}, glufosinate [2-amino-4-(hydroxymethylphosphinyl) butanoic acid], or imazapyr + imazethapyr. Imazapyr controlled established bermudagrass (Cynodon dactylon L.), broomsedge (Andropogon virginicus L.), johnsongrass [Sorghum halepense (L.) Pers.], tall fescue (Festuca arundinacea Schreb.), and dallisgrass (Paspalum dilatatum Poir.) in all instances. Several herbicides were used in selected combinations for PRE and/or POST applications in discrete rate trials. These were imazapyr, imazethapyr, glufosinate, imazapyr + imazethapyr, paraquat (1, 1′-dimethyl-4,4′-bipyridinium ion), atrazine [6-chloro-N-ethyl-N 1-(1-methyethyl)-1,3,5-triazine-2,4-diamine], and glyphosate [N-(phosphonomethyl)glycine]. The glufosinate-resistant corn hybrid in 1997 at Holly Springs, MS, with glyphosate PRE at 0.84 kg a.i. ha−1 followed by glufosinate POST (28 DAP) at 0.45 kg ha−1 produced a maximum yield of 10.2 Mg ha−1 Results from this study indicate that vegetation can be controlled for corn production in untilled sod comprised of warm-season perennials when transgenic hybrids are grown.

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