Agronomic practices to minimize lodging risk while maximizing yield and protein potential of spring wheat in the eastern Canadian Prairies
Notice bibliographique
Résumé
Spring wheat is one of the most economically important crops grown on the Canadian prairies. Improvements in genetics and agronomy have resulted in higher yields obtained by producers, but have introduced challenges such as maintaining grain protein content and managing increased lodging risk. The objectives of this thesis research were to evaluate the effect of agronomic management practices such as N management, plant density, plant growth regulator (PGR) application and their interactions on spring wheat lodging risk, grain yield and protein content of spring wheat in the eastern Canadian prairies. This was done through two small plot field trials in south central Manitoba during the 2018 and 2019 growing seasons using cultivars common to, and widely grown across Manitoba. Early season N availability was critical for the development of yield components and allowed the crop to buffer against dry environmental conditions to produce grain protein. However, increased lodging risk associated with application of large amounts of N early in the season needs to be balanced with lodging management strategies. Low plant densities (150 plants m-2) and PGR applications improved the crop’s ability to resist lodging in this research. The lowest plant densities tested (150 plants m-2) allowed the crop to better resist both root and shoot lodging through increases in stem and anchorage strength and stem flexibility indicators compared to the highest densities tested (350 plants m-2). Low plant densities are often associated with decreased early season competitive ability against weeds and more variable crop maturity, neither of which are desirable. Therefore, the ability of PGRs to reduce lodging risk, through increased stem strength and reduced leverage, provides a critical tool for lodging management in spring wheat in regions with high yield potential and lodging pressure. Flexibility of application and yield increases, even in the absence of lodging, through increased kernels per spike, support a wide adoption of this technology as yields are likely to continue to rise in the future across the Canadian Prairies.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».