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The vigorous growth habit and tolerances to heat, water, and acid stresses suggest cowpea as a candidate species for Controlled Ecological Life-Support Systems (CELSS). The low fat, high protein, moderate carbohydrate content of the edible leaves and seeds complement cereal grains in the vegetarian diets planned for CELSS. Cowpea canopy densities of 3.6, 7.2, 10.7, and 14.3 plants·m -2  were grown under CO 2  levels of 400 or 1200 μl·l -1 . Plants were grown in a deep-batch recirculating hydroponic system. pH was maintained at 5.5 by a pH controller with an in-line electrode. The nutrient solution was replaced as needed and sampled weekly for analysis by inductively coupled plasmaatomic emission spectrometry. Fluorescent lights provided 674±147 μmol·m -2 s -1  PAR for an 8-hour photoperiod. Day/night temperature was maintained at 27/25°C. CO 2  draw-down within the growth chamber was measured to calculate net photosynthesis. Power consumption was metered and canopy quantum efficiency was calculated. Crop yield rate (g·m -2 ·d -1 ). harvest index (% edible biomass), and yield efficiency (edible g·m-2·d -1 ·(nonedible g) -1 ) were determined to evaluate the productivity of cowpea for a CELSS. This study was supported by NASA Grant NAGW-2329.

734 PB 026 EFFECT OF CO2 LEVEL ON COWPEA CANOPY PHOTOSYNTHESIS AND GROWTH