Plant density tolerance in maize (Zea mays L.): Possible underlying physiological mechanisms
Bibliographic record
Abstract
Maize ('Zea mays' L.) grain yield (GY) and density tolerance (DT) have increased during the last decades; yet plant yield potential (pYP) remains unchanged. In a first study, DT and root to shoot ratio (R:S) were investigated in hybrids representing different eras of genetic improvement in Ontario. Additionally, the DT-pYP association was explored in a set of experimental hybrids exhibiting the different trait combinations. The DT in modern era hybrids was explained mostly by maintenance of harvest index (HI). Increased dry matter accumulation (DMA) from silking to maturity and reduced plant to plant variability also contributed to DT. The R:S increased in modern genotypes but this effect disappeared under shading. In the experimental hybrids the pYP was associated with both DMA and HI under low density stress. For both studies reduced barrenness (stable HI) rather than high pYP was the main contributor to DT.
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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".