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This article in AJ

  1. Vol. 78 No. 2, p. 288-291
     
    Received: Apr 16, 1982
    Published: Mar, 1986


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doi:10.2134/agronj1986.00021962007800020015x

Plant Height and Yield Responses of Rice to Paclobutrazol1

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

Abstract

Abstract

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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