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Agronomy Journal Abstract -

Plant Height and Yield Responses of Rice to Paclobutrazol1


This article in AJ

  1. Vol. 78 No. 2, p. 288-291
    Received: Apr 16, 1982

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  1. J. E. Street,
  2. J. H. Jordan,
  3. M. W. Ebelhar and
  4. D. L. Boykin2



Lodging of rice decreases speed and efficiency of mechanical harvest of rice (Oryza saliva L. ‘Starbonnet’). A 3-yr field study was conducted at Stoneville, MS, on a Sharkey clay soil (Vertic Haplaquept) to determine if rice height and lodging could be reduced with a growth regulator. Paclobutrazol [(2RS,3RS)-l-(4-chlorophenyl)-4,4-dimethyI-2-l,2,4-triazol-l-yl-)penta-ii-3-ol)] was applied at 0.14 and 0.28 kg a.i./ha 2 weeks before or 2 weeks after panicle initiation, and at 0.07, 0.14, and 0.28 kg a.i./ha at panicle initiation. Application of 0.28 kg a.i./ha of paclobutrazol 2 weeks after panicle initiation reduced rice height each year and increased rough rice yield in 2 of 3 yr. Lodging, which occurred in only 1 of 3 yr, was significantly decreased with 0.28 kg a.i./ha of paclobutrazol applied either at panicle initiation or 2 weeks after panicle initiation. Increasing preflood N rates to 168 kg N/ha plus applications of paclobutrazol did not consistently increase yields

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