Use of Ion-Exchange Membrane to Assess Nitrogen-Supply Power of Soils
Bibliographic record
Abstract
Soil nitrogen-supply power (NSP), including nitrogen (N) mineralized from organic matter, for crop growth is an important criterion in evaluating soil quality. Ion-exchange membranes in the form of plant root simulator (PRS) probes were used to measure ammonium and nitrate release rates as a measure of NSP in 54 Saskatchewan soils with contrasting pedogenic and management histories. Two incubation systems (aerobic and anaerobic), with ion-exchange membrane probes placed in situ, were conducted to predict NSP. The 54 soil samples were also used in two growth-chamber studies to assess patterns in plant N uptake by canola. Soil type had a profound influence on available N-supply rates, with soils of higher organic-matter content due to climatic conditions, slope position, and past management having higher NSP values. Good relationships (R2 = 0.54 and 0.69) between NSP and canola N uptake were observed. The N-supply rate values used as an index of NSP as predicted by two-week aerobic incubation for Brown, Dark Brown, and Black soils in Saskatchewan were 200–550, 550–1100, and > 1100 μg nitrate-N/10cm2/2 wks, respectively, with different management histories producing significant variation within a region.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".