| タイトル | Gas Exchange, Transpiration and Yield of Sweetpotato Grown in a Controlled Environment |
| 本文（外部サイト） | http://hdl.handle.net/2060/20100039591 |
| 著者（英） | Henderson, Keith E.; Henninger, Donald L.; Mortley, Desmond G.; Barta, Daniel J. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2000-08-06 |
| 言語 | eng |
| 内容記述 | Sweetpotato was grown to harvest maturity within NASA Johnson Space Center's Variable Pressure Growth Chamber (VPGC) to characterize crop performance for potential use in advanced life support systems as a contributor to food production, air revitalization and resource recovery. Stem cuttings of breeding clone "TU-82-155" were grown hydroponically at a density of 17 plants m(sup -2) using a modified pressure-plate growing system (Patent No. 4860-490, Tuskegee University). Lighting was provided by HPS lamps at a photoperiod of 12h light: 12h dark. The photosynthetic photon flux was maintained at 500, 750 and 1000 micro mol m(sup -2) s(sub -1) during days 1-15, 16-28, 29-119, respectively. Canopy temperatures were maintained at 28 C: light: 22 C:dark. During the light period, relative humidity and carbon dioxide were maintained at 70% and 1200 micro liters l(sup -1), respectively. Nutrient solution was manually adjusted 2 to 4 times per week by addition of 10X concentrated modified half-strength Hoagland nutrient salts and NaOH to return the electrical conductivity and pH to 1.2 mS cm(sup -1) and 6.0, respectively. At 17 weeks (119 days) from transplanting, a total of 56.5 kilograms fresh mass of storage roots (84.1% moisture) were harvested from the 11.2 m(sup 2) chamber, resulting in a yield 5.0 kilograms m(sup -2). Harvest index, based on fresh mass, was 38.6%. Rates of net photosynthesis, dark respiration, transpiration, and ethylene production will be reported. |
| NASA分類 | Life Sciences (General) |
| レポートNO | JSC-CN-6332 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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