A Data Base of Nutrient Use, Water Use, Co2 Exchange, and Ethylene Production by Soybeans in a Controlled Environment

ABSTRACTA data set is given describing daily nutrient and water uptake, carbon dioxide (CO2)exchange, ethylene production, and carbon and nutrient partitioning at harvest for an entirecanopy and root system of a soybean crop [Glycine max (L.) Merr. cv. McCall]. The data wereobtained from a 20 m2 stand of plants grown from seed to maturity (97 days) in a closed,controlled environment using a recirculating hydroponic system. Stand CO2 exchange rates weredetermined from nocturnal increases in CO2 (respiration) and morning drawdowns (netphotosynthesis) to a set point of 1000 lamol tool -1each day (i.e., a closed system approach).Atmospheric samples were analyzed throughout growth for ethylene using gas chromatographywith photoionization detection (GC/PID). Water use was monitored by condensate productionfrom the humidity control system, as well as water uptake from the nutrient solution reservoirseach day. Nutrient uptake data were determined from daily additions of stock solution and acid tomaintain an EC of 0.12 S m -1and pH of 5.8. Dry mass yields of seeds, pods (without seeds),leaves, stems, and roots are provided, as well as elemental and proximate nutritional compositionsof the tissues. A methods section is included to qualify any assumptions that might be requiredfor the use of the data in plant growth models, along with a daily event calendar documenting setpoint adjustments and the occasional equipment or sensor failure.INTRODUCTIONFew data sets are available that simultaneously track daily nutrient, water, and carbonfluxes for whole plant stands throughout the full period of their growth and development(Gerbaud et al., 1988; Wheeler et al., 1993; Andriolo et al., 1996). More typically, studies focuson only one or a few parameters. In addition, such studies are comonly conducted in the fieldwhere environmental conditions can vary and/or available resources are difficult to quantify. In anearlier paper, we presented a data base on the nutrient uptake, water use, carbon dioxide (CO2)fluxes, and biomass yields for a 20 m 2 of wheat grown hydroponically in a closed, controlledenvironment (Wheeler et al., 1993a). The intent of that paper was to provide a comprehensive

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