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Seed of  Viola  ×  wittrockiana  `Majestic Giant Yellow' were germinated in #406 plug trays at ambient CO 2 , 25 C and a light intensity of 100 μmol s -1 m -2  with an 18 hr photoperiod. At emergence and at successive one week intervals, seedlings were exposed to CO 2  levels of 500, 1000 or 1500 μl l -1  and irradiances of 100, 225, 350 μmol s -1 m -2  for 7 to 35 days, after which seedlings were transplanted into 10 cm pots and grown to flower in the greenhouse. CO 2  at 1000 μl l -1  was as effective as 1500 μl l -1  in accelerating growth in the plug stage. 500 μl l -1  at all irradiances did not accelerate growth significantly. Plants grown at 1000 μl l -1  and 225 μmol s -1 m -2  intensity reached the 5 leaf stage up to 14 days earlier than the control, as well as decreasing time to flower during the growing on phase.

098 ACCELERATING GROWTH OF PLUG-GROWN PANSIES WITH CARBON DIOXIDE AND LIGHT