MAXIMIZING GROWTH OF VEGETABLE SEEDLINGS IN CONTROLLED ENVIRONMENTS AT ELEVATED TEMPERATURE, LIGHT AND CO2.
Leaf expansion of seedlings grown under elevated growth chamber conditions was double that of seedlings in standard growth chamber conditions, and 6 to 7 times greater than under natural days in the greenhouse.
Temperature was the most limiting factor for seedling growth. At the levels of light and CO2 used in the experiment, CO2 was more limiting than light intensity. In general, optimum seedling growth was obtained when temperature, light, and CO2 were increased simultaneously.
The most striking effects of CO2 enrichment were precocious flower bud formation in tomato and cucumber and extensive growth of the lateral buds in all three species.