Measurement of phosphorus desorption from a spodic horizon using two different desorption methods and pH control
Bibliographic record
Abstract
Phosphorus (P) desorption is a key process in understanding the P dynamics in the subsoil of poorly drained Spodosols of the lower coastal plain of the United States. Phosphorus desorption is the major mechanism which defines the labile pool of spodic horizon inorganic P. The objective of this study was to compare methods for determining P desorption isotherms. A sequential extraction method was compared to a dilution method, and the need for pH control within each method was evaluated. Results showed that the sequential extraction method released more P than the dilution method and that pH control during either method did not significantly alter the results. The estimated partition coefficients (Kd) from the sequential method were significantly lower than the dilution method, especially at the lower solution P concentrations. At these low soil solution P concentrations, the variability in estimated Kd values would have a significant influence on the uptake predicted by mechanistic computer models.
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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 | 0.001 |
| 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 | 0.001 | 0.001 |
| 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".