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Record W1979218818 · doi:10.4314/ijbcs.v6i4.32

Caractérisation agromorphologique des accessions de riz adventices (<i>Oryza </i>sp) collectés dans les rizières de la zone interfluve du Tchad

2012· article· fr· W1979218818 on OpenAlexaff
BO Gaouna, ER Traore, S Assane, JD Zongo

Bibliographic record

VenueInternational Journal of Biological and Chemical Sciences · 2012
Typearticle
Languagefr
FieldAgricultural and Biological Sciences
TopicAgriculture and Rural Development Research
Canadian institutionsInstitut de Technologie Agroalimentaire
Fundersnot available
KeywordsOryza sativaForestryBiologyHorticultureGeography

Abstract

fetched live from OpenAlex

Le riz est la céréale de base des populations des Régions administratives de la Tandjilé et du Mayo- Kebbi Est, dans le sud du Tchad. Le rendement du riz est cependant relativement très bas (moins de 1 t/ha). Ceci est lié à plusieurs facteurs parmi lesquels la forte infestation des rizières par les riz adventices et la faible utilisation des semences des variétés améliorées haut rendement. Parmi les mauvaises herbes, les plus fréquentes et nocives pour le riz cultivé, sont les espèces comme Oryza sativa L., Oryza barthii (A Chev) et Oryza longistaminata (A. Chev et Roehr). Celles-ci montrent une forte dynamique de l'infestation dans les rizières des plaines inondées des Régions administratives de la Tandjilé et du Mayo-Kebbi Est. La caractérisation agromorphologique de 24 échantillons riz adventices issus des opérations de prospectioncollecte d'octobre 2005 à Mars 2006 a été réalisée. A partir d’un dispositif de Ficher à trois répétitions, une expérimentation a permis de mettre en évidence, par une analyse de variance , une classification ascendante hiérarchique et l'analyse factorielle discriminante, l'existence de cinq groupes de riz adventices.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.009
Threshold uncertainty score0.019

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0010.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

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.

Opus teacher head0.032
GPT teacher head0.294
Teacher spread0.262 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreEmpirical

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".

Quick stats

Citations1
Published2012
Admission routes1
Has abstractyes

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