Abstract
Seven growth chamber trials (six replicate trials using 0.035, 0.12, and 0.25 % CO 2 in air and one trial using 0.12, 0.80, and 2.0% CO 2 in air) and three replicate greenhouse trials (0.035, 0.10, 0.18, 0.26, 0.50, and 1.0% CO 2 in air) compare the effects of super-optimal CO 2 on the seed yield, harvest index, and vegetative growth rate of wheat ( Triticum aestivum L. cvs. USU-Apogee and Veery-10). Plants in the growth chamber trials were grown hydroponically under fluorescent lamps, while the greenhouse trials were grown under sunlight and high pressure sodium lamps and in soilless media. Plants in the greenhouse trials responded similarly to those in the growth chamber trials; maximum yields occurred near 0.10 and 0.12 % CO 2 and decreased significantly thereafter. This research indicates that the toxic effects of elevated CO 2 are not specific to only one environment and has important implications for the design of bio-regenerative life support systems in space, and for the future of terrestrial agriculture.
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