Field size and replicated research plots were conducted to evaluate the influence of various plant growth regulators on plant structure and yield of cotton. Results from those plots indicate a positive impact with PGR-IV(TM) [PGFI] as to boll retention and final yield. Evaluations with MEPICHLOR(TM) [MFC] (Mepiquat Chloride) support previous data as to its activity in reducing plant structure.