Radish (Raphanus sativa L. cv. Cherry Bomb II) Growth, Net Carbon Exchange Rate, and Transpiration at Decreased Atmospheric Pressure and / or Oxygen
Bibliographic record
Abstract
To simplify engineering requirements for plant growth structures on the Moon or Mars, lower pressures are desirable to reduce mass and decrease atmospheric leakage. In order to establish the effect of reduced pressure and reduced oxygen on carbon assimilation, dark period respiration, transpiration and plant growth, radishes (Raphanus sativa L. cv. Cherry Bomb II) were grown at 98 (ambient pressure), 66 (2/3 atm), 33 (1/3 atm), and 10 (1/10 atm) kPa total pressures with oxygen partial pressures of 20, 14, 7, and 2 kPa for 21 days. All plants were grown in rockwool using recirculating nutrient film technique hydroponics. Analysis of growth showed no significant difference among the 98, 66, 33, and 10 kPa total pressure environments when the oxygen partial pressure was ≥ 7 kPa, but a significant reduction was observed when the oxygen partial pressure was dropped to 2 kPa, regardless of the total pressure. Net carbon exchange rate (NCER) and transpiration showed a similar pattern, with no significant effect with pressure treatments. Only the reduced oxygen partial pressure treatment of 2 kPa resulted in significant reductions in NCER and transpiration. Results indicate that pressure has little effect on radish productivity as long as oxygen levels are maintained at or above 7 kPa.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".