Bibliographic record
Abstract
Optical instruments were proposed to assess the nitrogen (N) concentration of the leaves of wild lowbush blueberries (Vaccinium angustifolium Ait.). The objectives were to assess the effects of NPK fertilizer rates on leaf N concentrations and optical measurement values and to examine the relationship between leaf N concentration and optical measurements. Four rates of ammonium sulfate (0 to 90 kg N ha−1), two rates of P (0 and 20 kg P2O5 ha−1) and four rates of K (0 to 90 kg K2O ha−1) were applied in the spring of the sprout year. Leaf sampling and optical measurements were conducted four times during the sprout year. Optical measurements were made with a SPAD-502 meter (Minolta) and a Dualex3 meter (Force-A). Leaf N concentrations decreased during the growing season while SPAD and Dualex3 values increased, although SPAD values dropped at the end of the season. N rates increased leaf N concentrations and SPAD values on all sampling dates while decreasing Dualex3 values. The best estimate of leaf N concentration was obtained with SPAD measurements and with the SPAD/Dualex3 ratio carried out at the end of July (r2 > 0.73). However, as optical measurements depend on the sites, reference plots are needed to standardize the values.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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".