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1 results

  • Weed Control With Reduced Rates of Four Soil Applied Soybean Herbicides

  • Kilwake C. Muyonga, Michael S. Defelice, Barry D. Sims
  • Journal:
    Weed Science / Volume 44 / Issue 1 / March 1996
    Published online by Cambridge University Press:
    12 June 2017, pp. 148-155

  • Field studies were conducted at two locations in Missouri in 1990 and 1991 to evaluate control of velvetleaf, ivyleaf morningglory, and cocklebur in soybean with label rates (1×) or reduced rates (0.5×) of four PPI herbicides followed with or without cultivation and POST application of one fourth (0.25×) the label rate of imazethapyr. Weed control and soybean yield with the 0.5× rate of preplant clomazone, imazaquin, metribuzin, and metribuzin + chlorimuron followed by either cultivation or imazethapyr POST was equivalent to a 1× rate of the PPI herbicides followed by either cultivation or imazethapyr. Weed control and soybean yield with the 0.5× rates of the PPI herbicides without cultivation or POST imazethapyr were lower than with 1× rates of PPI herbicides.