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Plant Height and Yield Responses of Rice to Paclobutrazol 1
Author(s) -
Street J. E.,
Jordan J. H.,
Ebelhar M. W.,
Boykin D. L.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800020015x
Subject(s) - panicle , paclobutrazol , oryza sativa , agronomy , yield (engineering) , loam , poaceae , field experiment , rice plant , horticulture , biology , soil water , materials science , biochemistry , metallurgy , gene , ecology
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)‐1‐(4‐chlorophenyl)‐4,4‐dimethyI‐2‐1,2,4‐triazol‐1‐yl‐)penta‐n‐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