Assessment of the role of soil structure and water content in the interpretation of spatial variation in yield and yield response to nitrogen
Bibliographic record
Abstract
The Least Limiting Water Range (LLWR), is defined as the range of water contents in which aeration, water and soil resistance are the least limiting for plant growth. It was hypothesized that the LLWR and water contents measured outside of the LLWR would explain much of the variation found in yield and yield response to fertilizer N. Water contents, soil properties and yields were measured on 12 sites across southern Ontario. Results showed that the LLWR parameters were poor predictors of the variability in yields. Many observed water contents were also found to be less than the wilting point. Kay et al. (1999) defined a lower water content limit based on the cessation of photosynthesis ([theta]0p). This study determined that the difference between water contents and [theta]0p (plant extractable water) correlated well with yield. Organic carbon was significantly correlated to yield and yield response, and improved yields under drought and saturated conditions.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 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".