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Agronomy Journal Abstract -

Effect of Triazine Herbicides on the Prussic Acid Content and Forage Yield of Sorghums1


This article in AJ

  1. Vol. 62 No. 1, p. 101-102
    Received: July 12, 1969

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  1. A. R. Brown and
  2. E. R. Beaty2



Prometryne and atrazine were applied preemergence at 2.24 and 4.48 kg/ha on five hybrid forage sorghums in 1965. Propazine preemergence and atrazine postemergence were applied at the same rates in 1966 and 1967. Forage was harvested in the boot stage simulating green chop. A lO-cm stubble was left to facilitate regrowth. Prussic acid was determined qualitatively by the A.O.A.C. Na-picrate paper method. The use of prometryne, atrazine, and propazine as herbicides for weed control in forage sorghums did not increase the prussic acid content of the forage. The 2.24- and 4.48- kg/ha rates of prometryne and atrazine applied preemergence depressed forage yields in 1965. The 2.24- and 4.48-kg/ha rates of atrazine postemergence and propazine postemergence did not reduce forage yields of any forage sorghums in 1966 and 1967 except ‘Dekalb SX-11’ which was drastically reduced by the higher rate of atrazine.

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