This research was undertaken to investigate cotton (Gossypium hirsutum L.) reproductive physiology as it relates to Crop Water Stress Index (CWSI). Five levels of CWSI were established as treatments to assess cotton response to imposed water stress. Indices investigated were .16, .35, .36, .40, and .62. Daily tagging of opened flowers in each treatment was conducted throughout the season. Floral production, abscission and boll retention were negatively correlated to CWSI. A two day lag response was observed between a decrease in CWSI values resulting from irrigation, and daily flowering increase.

Keywords : Cotton Physiology; Cotton Water Requirements