The effect of a long-term black medic (Medicago lupulina) cover crop on arbuscular mycorrhizal fungi colonization and nutrient uptake of flax (Linum usitatissimum)
Bibliographic record
Abstract
Black Medic (Medicago lupulina) Cover Crop on Arbuscular MyconhizalFungi Colonization and Nutrient Uptake of Flax (Linum usitafissimum).Malor Professor; Martin H. Entz.Cover cropping with black medic (Medicago lupulina cv.George) was investigated as a potential method of increasing arbuscular myconhizal fungi (AMF) colonization and early nutrient uptake in flax (Linum usitatissimum) by examining (1) early AMF colonization and nutrient uptake of flax in the field and (2) the effect of soil disturbance on early AMF colonization of flax grown after black medic in a growth chamber study.All samples (field study) and intact soil cores (growth chamber shrdy, Manitoba) were collected from low and high soil test P long-term field experiments with the presence of black medic in a flax -wheat (Tritícum aestivum) -oaT (Avena sativa) rotation established in Manitoba and Saskatchewan in 2000 and 2002, respectively.In the field study, a black medic cover crop had no influence on early AMF colonization by arbuscules or hyphal structures.When all site years were combined early flax concentrations of N, P, K and Zn were increased in the cover crop treatment, however, the cover crop had no effect on the total flax uptake of N, P, K, Mg, Zn, and Mn.The early uptake ofS, Ca, Cu and Fe by flax was decreased in the black medic cover crop treatment.At one of the four site-years total flax P uptake was increased by the cover crop treatment though there was no effect on total N uptake.The results of the field study suggest that long-term cover cropping with black medic may have an effect on macro-and micro-nutrient uptake in flax that is not directly ¡elated to changes in the extent of AMF colonization.lx In the growth chamber study, flax following black medic had higher early percent root length colonized by arbuscules than flax grown after soil that was left fallow (P=0.0648).Early flax hyphal colonization was not affected by the cover crop.Soil disturbance had no effect on the early flax root AMF colonization.The growth chamber experiment demonstrates that cover cropping with black medic is an effective method of increasing early AMF colonization.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".