Nitrous Oxide Flux from Solid Dairy Manure in Storage as Affected by Water Content and Redox Potential
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Bibliographic record
Abstract
Abstract The current global N 2 O budget estimates that animal production contributes one third of agricultural emissions. A study was conducted on solid dairy manure to determine the potential for N 2 O emission during storage. A laboratory flow‐through chamber and tunable diode laser analyzer were employed to continuously quantify the N 2 O flux in a temperature‐controlled environment. Water, NO 3 ‐N and NH 4 ‐N contents and redox potential ( E h , using a platinum and Ag‐AgCl reference electrode) also were monitored. In Experiment 1, manure samples were collected (4.3 kg wet weight) from three layers near the surface of the pile (0–15, 15–30, and 30–45 cm) and incubated at 22°C for 20 d. The mean daily N 2 O‐N fluxes were between 0 and 0.33 g N m −2 d −1 , and N 2 O was only generated in samples from the top two layers of the pile. In Experiment 2, samples from the 30‐ to 45‐cm depth were adjusted by amendment with chopped straw to 70, 75, and 80% water content (WC). These samples showed less variable fluxes and produced twice as much N 2 O‐N as the unamended samples. Levels of straw‐amendment had no significant effect on N 2 O emissions. Combined results from both experiments revealed that fluxes were highest at 55 to 70% WC and 150 to 250 mV E h . The N 2 O emission was limited by low NO 3 ‐N levels in samples with high WC and low E h . Increasing WC and decreasing E h with depth and increasing levels of NO 3 in the surface layer over time revealed that the exterior of solid manure piles is crucial to the flux of N 2 O.
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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 | 0.000 | 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) | 0.001 | 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 it