Nitrogen Acquisition of Pea-Oat and Pea-Canola Intercrops and Their Impact on Subsequent Wheat Crops
Notice bibliographique
Résumé
The increased diversity provided by intercropping systems can provide many benefits, including increased nitrogen (N) use efficiency (NUE). The ability of legume crops to fix atmospheric N can increase in an intercrop, leading to increased productivity compared to monocrops. However, limited research has tested the efficiency of intercropping systems in western Canada and their effect on subsequent crops. Therefore, pea-oat (PO) and pea-canola (PC) intercrops (mixed row) were grown at Swift Current, Melfort, and Redvers, Saskatchewan followed by wheat in the subsequent year. Each of the intercrops were supplied with three N fertilizer rates (0, ¼, ½ of their recommended rate), while the monocrops (pea, oat, canola) received their full recommendation of N fertilizer, except pea which received no N fertilizer. In the following year, wheat was supplied with its full recommendation of N fertilizer. The 15N dilution method was used to measure the percentage of N derived from the atmosphere (%Ndfa), %N transfer, N fertilizer recovery, and residue recovery in the succeeding wheat crop. The %Ndfa measured the percentage of N in pea that was derived from the atmosphere. In contrast, biological N fixation (BNF) determined the amount of N uptake that was from the atmosphere. The %Ndfa increased in pea intercrops compared to the pea monocrop but due to reduced pea biomass in PO, it decreased the amount of N derived from fixation by 8% compared to the pea monocrop; however, PC increased this amount by 23%, on a per-plant basis. These differences in BNF did not influence productivity, where the intercrops were similar to monocrops. The intercrops produced grain land equivalent ratios (LER) of 0.94 (PO) and 0.98 (PC). In contrast, PC accumulated more above-ground dry matter N than PO and had a 3% advantage over its respective monocrops. This enabled wheat to produce 5% more yield following PC compared to PO but no differences were found between intercropping and monocropping systems. The recovery by wheat of above-ground residue N was higher in monocrops than the intercrops but the low recovery (4%) did not have any impact on wheat yield between the two systems. Overall, PC intercrops appear to be a viable option for producers as they increased BNF, N uptake, and produced slightly higher yields of the following wheat crop than PO. This intercrop also provided comparable intercrop and wheat yields to its monocropping systems; therefore, its ability to utilize N more efficiently made up for reduced fertilizer applications.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».