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A wheat (Triticum aestivum cv. Yecora Rojo) stand was grown using nutrient film culture in the closed conditions of NASA's Biomass Production Chamber. Rates of photosynthesis and respiration of the entire stand (about 20 m 2 ) were determined daily using a regime of 20 hr light/4 hr dark, 20 C light/16 C dark an average PPF of 600 μmol/m 2 /s from HPS lamps, and a CO 2  cone of 1000 ppm. Fractional interception of PPF by the stand reached a maximum of 0.96 at 24 days from planting. Rates of photosynthesis were constant throughout the photoperiod as determined by short term drawdowns of CO 2  throughout the photoperiod. Drawdown rates of CO 2  were correlated with rates determined by logging of mass flow of CO 2  injected during chamber closure. Photosynthetic drawdowns of CO 2  indicated that photosynthesis was not saturated at 1000 ppm CO 2  and that the CO 2  compensation point was about 50 ppm. Whole stand light compensation points were 200 to 250 μmol/m 2 /s between days 13 and 70 and then increased rapidly during senescence.

CARBON DIOXIDE EXCHANGE OF A WHEAT STAND GROWN IN NASA'S BIOMASS PRODUCTION CHAMBER