Cotton (Gossypium hirsutum L.) is a perennial crop with an indeterminate growth habit, and is very responsive to environmental changes and management. Consequently, producers and researchers have long been interested in the use of plant growth regulators (PGRs) for controlling plant growth and improving cotton yield (Oosterhuis and Egilla, 1996). Various PGRs have been used for controlling plant growth. Mepiquat chloride has been the most successful and widely used in cotton production. Application of PGRs to improve cotton growth and yield has been a widely accepted practice in cotton production.