Economic Assessment of Potato Response to Struvite and Conventional Phosphorus Fertilizer in Eastern Canada
Bibliographic record
Abstract
Abstract Phosphorus (P) fertilizers are essential but potentially inefficient, especially in shallowrooted potatoes. A 3-year field experiment (2016-2018) was conducted in four distinct sites in Eastern Canada to investigate economic and environmental impacts of struvite-based slow-release and conventional P fertilizers in potato ( Solanum tuberosum L.). Marginal return (MR = gross revenue-total operating cost) was assessed for different P treatments (0, 60, 120, 180, and 240 kg P 2 O 5 ha -1 ) from triple super phosphate (TSP) and for different mixtures of struvite (25%, 50%, and 75%) and TSP at 180 P 2 O 5 kg ha -1 . Comparable MRs to TSP at a rate of 180 kg P2O5 ha- 1 were obtained with a mixture of 75% TSP and 25% struvite across sites and years. Results demonstrated that a struvite-based mixture can be a viable alternative to conventional P fertilizers, improving profitability and lowering potential cumulative environmental costs associated with P application by $8-$24 ha -1 year -1 for potato production.
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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 | 0.002 | 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) | 0.000 | 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".