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Published in Crop Sci 9:339-341 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fiber Elongation Rates in Five Varieties of Cotton (Gossypium hirsutum L.) as Influenced by Night Temperature1

J. R. Gipson and L. L. Ray2

Five cotton varieties were grown in the field under four different night temperature regimes (10, 15, 20, and 25 C). The influence of temperature on the rate and extent of fiber elongation was studied. Temperatures below 20 C reduced fiber length; and generally, the reduction was greater in varieties having the longer fibers. Lowering night temperature increased the fiber elongation period and slowed the fiber growth rate. The temperature coefficients of elongation indicated the rate of elongation for all varieties was extremely temperature-sensitive up to 15 days age. Beyond 15 days age, however, the coefficlents of elongation quickly approached one, indicating temperature independence.

Key Words: Field growth chamber • Fiber length • Temperature coefficients

1 Approved by the Director of the Texas Agricultural Experiment Station as Technical Article No. 7555. Research supported in part by grants from the Cotton Producers Institute and Plains Cotton Growers, Inc.

2 Assistant Professor and Associate Professor, respectively, Texas AS~M University Agricultural Research and Extension Center, Lubbock 79401.

Received for publication October 28, 1968.


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Phenology Measurements and Fiber Associations of Near-Long Staple Upland Cotton
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C. A. Braden and C. W. Smith
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