Residues from a buckwheat (<i>Fagopyrum esculentum</i>) green manure crop grown with phosphate rock influence bioavailability of soil phosphorus
Bibliographic record
Abstract
Low soil test phosphorus (P) concentrations are common in organically managed soils in Canada. This field study examined the effect of residues from a buckwheat (Fagopyrum esculentum) green manure (GM) crop grown with an igneous and a sedimentary source of phosphate rock (PR) on in situ soil P supply, Olsen P, and soil microbial biomass P on an organic farm in Ontario, Canada. Phosphate rock application did not increase GM dry matter production, but did increase above-ground tissue P concentration with applications of the sedimentary PR (Calphos). In the following spring, in situ soil P supply and Olsen P were increased in GM residue-applied soils and in soils containing the Calphos PR, while microbial biomass P was largely unaffected. Release of P was detected when GM P concentration was greater than 2.9 g P kg-1. The results suggest the quality of the GM residues had more influence on P availability than the quantity applied to the soil; however, the low changes in available P (P supply and Olsen P) were not agronomically significant. Key words: Phosphate rock, soil phosphate supply, Olsen P, organic agriculture, green manure
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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 | 0.000 |
| 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 | 0.000 | 0.000 |
| 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".