Handbook of Plant and Crop Physiology

C. Parameters of Composite Lighting Using the symbols given in Figure 2A for the general case of composite lighting, the two bas ...

mol m^2 day^1. Although the plants in both treatments fixed statistically indistinguishable amounts of carbohydrates per day, ...

[29] concluded that, by slowly lowering the conditioning irradiance in the acclimatization area, the LCPs of these shade-toleran ...

the HYSAL treatment for 30 days were 199 moles/m^2 , being 60.6% solar and 39.4% artificial. The HPS reference was made to recei ...

where PPF 1 is the low instantaneous PPF, PPF 2 is the high instantaneous PPF, and mis a constant. Com- bining Eqs. (2), (4), an ...

have 4–6 hr in darkness during a 24-hr cycle. Also, for any given daily integrated PPF, a lower average instantaneous PPF is pre ...

SC Huber, TW Rufty, PS Kerr. Effects of photoperiod on photosynthate partitioning and diurnal rhythms in su- crose phosphate sy ...

48 Plant Growth and Human Life Support for Space Travel Raymond M. Wheeler National Aeronautics and Space Administration, Kenned ...

926 WHEELER ET AL. Figure 1 NASA’s Biomass Production Chamber located at Kennedy Space Center, Florida. The chamber provides 20 ...

When one considers travel to other planets, resupply costs will force even more recycling and even- tually some in situ food pro ...

to optimize crop performance. The gravitational environment must also be considered: for example, or- biting space stations and ...

PLANT GROWTH AND LIFE SUPPORT IN SPACE 929 cle [21,24]. An Earth-orbiting space station would typically have a 90-min orbital cy ...

Carbon Dioxide With the assistance of physicochemical control systems, adequate CO 2 concentrations (i.e., CO 2 partial pressu ...

Temperature Many of the crops considered for life support (rice, peanut, soybean, and sweetpotato) prefer warmer tem- perature ...

B. Horticultural Considerations Plant tests for bioregenerative technologies have utilized a range of nutrient/water delivery co ...

with the plant roots serve a critical role in degrading many of the soluble organics [96,97]. The driving process for purifying ...

planted to their final spacing, thereby improving space use efficiency and productivities [107]. Thus edi- ble biomass productiv ...

would be needed (Figure 4). Depending on mission constraints, this might be acceptable if energy is lim- ited but growing volume ...

itoring equipment in the spaceflight growth chamber used for this study showed active photosynthesis (CO 2 uptake during light c ...

creases the probability of finding acceptable, transparent materials that could be used for low-mass, in- flatable greenhouses [ ...