EFFECTS OF NITROGEN SOURCE AND NITROGEN METABOLISM ON CHLOROSIS IN LEAVES OF âSR 7200â VELVET BENTGRASS (AGROSTIS CANINA L.)
Bibliographic record
Abstract
Field observations show that velvet bentgrass (Agrostis canina L.) (VB) an alternative species to creeping bentgrass (Agrostis stoloniera L.) (CB) exhibits chlorosis in the leaves at high nitrogen rates. Growth chamber experiments were conducted that compared VB and CB using a hydroponic system. The experiments tested 5%NH4+-N, 45%NH4+-N, 95%NH4+-N and urea N-sources. Chlorosis only occurred in VB at the 95% NH4+-N and 100% urea-N source. Nitrate, nitrite, and ammonium levels in leaves showed ammonium accumulation was positively correlated to chlorosis in VB. Enzyme analysis showed initial glutamine synthetase (GS) activity in roots compared to leaves is higher in CB than in VB, explaining low ammonium levels in leaves of CB. The GS activity in the roots of VB increased after 24 hours of treatment. The results showed that the chlorosis in the leaves of VB is the correlated to ammonium accumulation associated with nitrogen form supplied and GS activity.
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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 | 0.001 |
| 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".