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Agronomy Journal Abstract -

Response of Corn to Low-Rate Foliar Sprays of Dinoseb1


This article in AJ

  1. Vol. 70 No. 4, p. 626-628
    Received: Apr 27, 1977

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  1. R. R. Johnson,
  2. G. E. McKibben,
  3. R. G. Jeppson and
  4. S. K. Jurgens2



Corn (Zea mays L.) producers have expressed widespread interest in using low rate foliar sprays of 2-sec-butyl-4,6-dinitrophenol (dinoseb) as a growth regulator to enhance grain yield. In four experiments conducted at two locations during a 2-year period, dinoseb was applied as nearly as possible to 3 weeks before tassel emergence to evaluate its effect on yield. Rates of 0, 7.4, 12.4, and 24.7 g dinoseb/ha were used in all experiments, and five adapted commercial hybrids and one two-ear synthetic were used in the different experiments. Dinoseb applied to four hybrids at one location in 1975 caused a 6 to 8% yield decrease and a 1 to 2% increase in barrenness. An increase in nubbin ears (less than 40 kernels per ear) was also associated with the yield loss. During 1976, yield of the synthetic increased 4% at the 12.4 and 24.7 g/ha dinoseb rates, but a commercial hybrid in the same trials was not affected by treatment. Dinoseb affected the formation of second ears with both increases and decreases in this trait being observed at similar chemical rates. It is concluded that in these experiments corn responded in an unpredictable manner with dinoseb applications to different genotypes in different environments.

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