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Published in Agron J 59:441-444 (1967)
© 1967 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Relative Humidity, Temperature, and Light Intensity During Boll Opening on Cottonseed Quality1

J. M. Woodruff, F. S. McCain and C. S. Hoveland2

Two laboratory experiments were conducted to study the influence of relative humidity, temperature, and light intensity during the boll-opening period on cottonseed quality. Seed quality was reduced as relative humidity increased above 60y0 during a 21-day exposure period. Increasing relative humidity from 60 to 70% caused a rapid decrease in rate of radicle growth of 5-day old seedlings. Raising relative humidity to SOY0 and above resulted in a rapid increase in free fatty acids accumulated in seed oil during the exposure period.

Raising temperature of exposure period from 25 C to 40 C at constant relative humidities had little influence on seed quality. Increasing light intensity from 50 ft-c to 2,000 ft-c at 35 C and 80% relative humidity did not influence seed quality.

Key Words: Gossypium hirsutum L. • seed production • seed germination • free fatty acids

1 Contribution from the Department of Agronomy and Soils, Auburn University Agricultural Experiment Station, Auburn, Alabama. This research was supported by the Alabama Crop Improvement Association and the National Cotton Council and is part of a M.S. thesis submitted by the senior author to Auburn University.

2 Graduate Student Aide (now at Department of Agronomy, Virginia Polytechnic Institute), former Professor of Crops (now Chairman, Division of Agriculture, Abraham Baldwin Agricultural College), and Associate Professor of Crops.

Received for publication March 15, 1967.




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Copyright © 1967 by the American Society of Agronomy.