Cost Minimization and Managing Soil Nutrient Loading: Conflict or Compromise?
Bibliographic record
Abstract
The consolidation of agricultural operations over time has led to fewer, larger farms. For livestock operations, this consolidation has also led to higher animal concentrations and a greater incidence of production externalities. While nitrogen leaching problems are relatively well documented, phosphorus runoff is fast gaining attention as the next big nutrient‐related environmental problem associated with large, highly concentrated livestock operations. One approach for managing soil nutrient loading on dairy farms is for farm or feed mill operators to better manage what they feed livestock. The results suggest that, at typical feed prices, slight reductions in nitrogen loading and significant reductions in phosphorous loading can be accomplished with minimal increases in the cost of dairy rations. An important implication of these results is that the model can be used as a performance standard to help producers and feed millers determine the cost and level of nutrient reduction that are possible. The approach also suggests which ingredients could be most problematic relative to nutrient excretion goals. Avec le temps, la consolidation des activités agricoles a donné naissance à des exploitations plus vastes mais moins nombreuses. Dans le secteur de l'élevage, cette consolidation a aussi débouché sur une plus grande densité de la population animale et une incidence plus marquée des coûts de production externes. Si l'on possède une documentation relativement abondante sur la lixiviation de l'azote, celle du phosphore attire de plus en plus l'attention, car on y voit le prochain problème majeur de pollution associé aux grands élevages à forte concentration d'animaux. Une façon d'aborder la surcharge des sols en éléments nutritifs dans les fermes laitières consiste à amener les producteurs ou les fabricants d'aliments du bétail à prêter une plus grande attention à ce qu'ils donnent aux animaux. Les résultats de l'étude laissent croire qu'au prix typique des aliments pour animaux, on pourrait réduire légèrement la charge d'azote et sensiblement celle de phosphore en majorant de façon minime le prix des rations pour bovins laitiers. Ces résultats impliquent notamment qu'on peut se servir du modèle comme norme de rendement afin d'aider les producteurs et les fabricants d'aliments àétablir la réduction de la concentration des éléments nutritifs réalisable et son coût. Cette méthode indique aussi quels ingrédients soulèveraient le plus de difficultés en regard des objectifs d'excrétion des éléments nutritifs.
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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 | 0.003 | 0.008 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.002 | 0.005 |
| Research integrity | 0.003 | 0.002 |
| Insufficient payload (model declined to judge) | 0.007 | 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".