Growth response of cotton to CO2 enrichment in differing light environments

Experiments were conducted to examine the growth responses of cotton (Gossypium hirsutum L. cv. Coker 315) to CO 2 enrichment under different light regimes. Plants were exposed to 350 or 700 μl l -1 CO 2 and six light treatments differing in photosynthetic period length (8 or 16 h) and in photosynthetic photon flux density (PPFD) for 32 days of vegetative growth. Higher PPFD (1 100 μmol m -2 s -1 ) was provided by a combination of high intensity discharge and incandescent lamps