Effects of Humalite Soil Amendment on Mitigating Drought Stress in Canola (Brassica napus L.)
Notice bibliographique
Résumé
Canola is one of the dominant revenue-generating crops globally. Since it was bred in the 1970s, it quickly became the third most grown oilseed crop after palm and soybean, partially due to its favorable fatty acid profiles. Drought stress is recognized as one of the most significant abiotic stressors among varying crop productions globally, where ongoing climate change has profoundly increased extreme weather incidents in croplands. In Canada, the vast majority of canola production occurs in the Canadian Prairies, where the limited water availability and increasing drought events often restrict its production. Due to its significant share of the economy in the Canadian Prairies, it is critical to seek strategies to mitigate the impact of drought stress on canola cropping systems. Humic substances have been recognized for promoting effects on soil health and bio-stimulatory effects on plant growth, with some evidence of improved overall plant stress tolerance. Humic substances have been reported to interact with plant hormone signaling pathways, particularly those that play critical roles in regulating plant growth and responses to abiotic stresses. Humalite is a naturally occurring humate material rich in humic acids exclusively deposited in southern Alberta, Canada. Its capability in improving soil organic carbon and nitrogen availability makes it a promising option for enhancing drought tolerance in canola cropping systems. In this study, we evaluated the effects of humalite on canola vegetative growth, photosynthetic and physiological traits, seed yield and oil quality parameters, as well as stress indicators, under varying moisture conditions and different growth stages. In this study, two different greenhouse studies wereconducted: (i) drought stress imposed at\nthe vegetative growing stage, and (ii) drought stress imposed at the flowering till pod filling stage. In both studies, canola was grown in pots under greenhouse conditions with four different humalite rates (0, 400, 800, and 1600 kg ha-1), maintained at 80% and 30% field capacities (well-watered control and drought-stressed condition, respectively). Results indicated that drought stress in both trials significantly reduced canola performance on the tested parameters. Under well-watered conditions, humalite-supplied plants at 400 kg ha-1 demonstrated significantly improved photosynthesis (13%), shoot dry weights (14%) and root dry weights (31%), biomass water-use efficiencies (11%), seed numbers (14%), and oil yields per plant (13%). With drought stress imposed during the vegetative growth stage, 400 kg ha-1 of humalite supply improved photosynthesis (54%), transpiration (82%), and stomatal conductance (194%), while reducing intrinsic water-use efficiency (-17%). With drought stress imposed during flowering and pod filling stage, 400 kg ha-1 of humalite improved seed numbers (29%), seed weights per plant (27%), oil yields per plant (32%), and harvest index (14%), with reduced stearic acid (-5%), free fatty acids (-61%), and glucosinolates (-17%). These research findings highlight the potential of humalite as a soil amendment to improve canola growth and yields, particularly under moisture-deficient conditions, and provide insights into sustainable agricultural practices.
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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.
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