Germination Characteristics of Polymer‐Coated Canola (<i>Brassica napus</i> L.) Seeds Subjected to Moisture Stress at Different Temperatures
Bibliographic record
Abstract
Polymer coatings have recently been developed to prevent germination and thereby reduce undesirable emergence of fall‐seeded canola ( Brassica napus L.) in western Canada. However, recent observations suggest that if seeds are not exposed to moist soil conditions in the fall, these polymer coats may prevent imbibition and subsequent germination during the following spring. Our objective was to determine the effects of moisture stress and polymer coat on canola seed germination characteristics in the laboratory. Polymer‐coated and non‐polymer‐coated canola seeds were germinated in polyethylene glycol (PEG 8000) solutions with initial osmotic potentials ranging from 0 to −1.25 MPa at 5 and 15°C. Polymer coat treatments caused higher median germination times and lower final germination percentages compared with film‐coated and uncoated control seeds. Germination characteristics of polymer‐coated seeds were negatively influenced by decreasing initial osmotic potential, particularly at 5°C. Although not always significantly different from the uncoated control, film‐coated control seeds behaved similarly to those coated with polymers. Among the three polymer coat treatments examined, one polymer coat treatment consistently exhibited higher germination compared with the other two. The results of this study help explain the occurrence of low spring seedling populations of fall‐seeded, polymer‐coated canola following a dry fall, particularly under low spring soil temperatures.
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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 | 0.000 | 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) | 0.000 | 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".