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Sulphur Dioxide Fumigation of Cotton and Its Effect on Fiber Quality¹

Synopsis: Light to moderate defoliation of cotton plants by sulphur dioxide had no detrimental effect upon fiber grade, staple length, or ginning percentage. A significant increase in grade and staple length due to fumigation was noted on the first picking. There was no significant difference on the second and third pickings.

² Department of Agricultural Investigation, Phelps Dodge Corporation, Douglas, Arizona. The authors express their gratitude to Prof. Irwin Miller, Statistician, Arizona State University, for valued assistance with the statistical methods and to Prof. Thomas W. Barrett for helpful suggestions and advice.

Received for publication June 12, 1964.