Transformation and recovery of fertilizer phosphorus applied to five Quebec Humaquepts
Bibliographic record
Abstract
Improving phosphorus (P) fertilizer efficiency while minimizing environmental impacts requires better understanding of the dynamics of applied P in soils.This study assessed the fate of fertilizer P applied in Quebec Humaquepts.A pot experiment with five textural Humaquepts, each receiving 0 (P0), 10 (P10), 20 (P20) and 40 (P40) mg P kg (1 soil was conducted under barley (Hordeum vulgare L.)-soybean (Glycine max L.) rotations.A modified Hedley procedure was used for soil P fractionation.The clayey soils reached a plateau of dry matter at less P applied than the coarser-textured soils.Plant P uptake, soil labile inorganic P (resin-P'/NaHCO 3 -P i ) and moderately labile inorganic P (NaOH-P i ) increased proportionally with P rate.The coarser-textured soils had lower contents of labile and moderately labile P i , but a larger increase in labile P i than the finer-textured soils after receiving P additions.The applied P was retained primarily as soil labile P i , accounting for 43 /69% of total soil recovery of applied P, compared to 20 /30% recovered as moderately labile P i , and 7 /29% assumed to be sparingly soluble P (HCl-P'/H 2 SO 4 -P).The labile P i recovery of applied P was linearly depressed with clay content, compared to a quadratic relation for the moderately labile P i recovery.The results suggest the importance of accounting for soil texture along with soil P adsorption capacity when assessing the efficiency of applied P, P accumulation in soils and subsequently P nutrient management.
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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 | 0.000 | 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 | 0.001 |
| 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".