Studies were conducted to generate data on the effects of different levels of PIX^® (mepiquat chloride) and PREP^® (ethephon) at a range of temperature an water regimes on several physiological processes in cotton (Gossypium hirsutum L.) for the purpose of simulation modeling. These experiments were conducted in naturally lit controlled environment chambers at day/night temperatures of 20/10, 25/15, 30/20, 35/25, and 40/30 C with a CO₂ concentration of 350 µL^-1.