Impact of Fertilizer P Source, Rate, and Placement Strategy on Pea Yield and P Uptake Across Variable Topographies in Saskatchewan
Bibliographic record
Abstract
The plant availability and mobility in soil of a fertilizer phosphorus (P) source is influenced by the solubility of the fertilizer product itself as well as the reaction products formed in soil over time. In 2022, response of pea yield, P uptake and recovery along with soluble reactive P concentrations in snowmelt water were determined for eight fertilizer P sources applied in a broadcast or side-band placement strategy at a low and high (20 vs 40 kg P2O5 ha-1) rates in the second year of a three-year study conducted at three field sites across SK. The field sites represent unique landform complex positions (knoll, mid-slope, and depression) and provide contrasts in soil properties. Soil P availability assessments conducted in the fall of 2021 following the first year of the study indicate variation in plant-availability of residual P among sources. However, differences in 2022 pea grain and straw yields were no t significant among P treatments, explained by pea being an efficient scavenger of soil P and not highly responsive to P fertilizer management.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
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".