Emergence and Persistence of Volunteer Flax in Western Canadian Cropping Systems
Bibliographic record
Abstract
Flax ( Linum usitatissimum L.) is being evaluated as a platform crop for genetically engineered (GE) novel oils but it must be able to coexist with non‐GE flax without causing market harm. The GE flax volunteers are a potential source of gene flow via pollen and seed. Field experiments in 2005 and 2006 quantified emergence periodicity of volunteer flax in direct seeded and conventionally tilled fields. Germination and emergence rates of naked seeds and seed retained in flax bolls were compared in laboratory and greenhouse trials. Lastly, 20 commercial flax fields were surveyed to quantify population size and persistence of volunteer flax for 3 yr following the flax crop. Volunteer flax emergence ranged from 31 to 4597 plants m −2 , the year following flax crops. Emergence was slower in direct seeded fields compared to conventionally tilled with 50% emergence (E 50 ) occurring at 340 and 228 growing degree days (GDD), respectively in 2005 and 297 and 236, respectively in 2006. The E 50 occurred after crop emergence and before in‐crop herbicides are normally applied. Greenhouse experiments confirmed that emergence of volunteer flax may be prolonged because seeds retained in flax bolls are protected from germination. In surveyed commercial fields, flax volunteer populations declined rapidly between the first and second year, but continued to emerge in some fields 3 yr following flax production. Field surveys confirmed the relatively slow emergence of volunteer flax, with the highest volunteer flax density observed in the survey period before in‐crop herbicide application. Few flax volunteers set seeds in commercial fields and are, therefore, unlikely to contribute to population persistence. Volunteer flax requires effective control in the year following the crop to reduce the potential for pollen‐ and seed‐mediated gene flow.
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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) | 0.001 | 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 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".