Analysis of prediction maps and data separation methods for site-specific management of wild blueberry
Notice bibliographique
Résumé
Wild blueberry (Vaccinium angustifolium Ait.) is a key crop in the Lac-Saint-Jean region of Quebec. The industry totals $45 million annually. Wild blueberry is a lowbush species which flourishes in heterogeneous agronomic conditions where conventional crops cannot. It grows in areas of varying topography on sandy, acidic soils where competition with other plants is limited. Rhizome establishment takes years to develop, thus, bare spots are a common feature of young or poorly managed fields. Given the variation of soil, topography, and crop density, wild blueberry production would benefit from site-specific management, where levels of nutrient input are tailored to local needs based on within-field variation. A classic approach to site-specific management is the delineation of management zones, sub- field areas of relatively homogenous agronomic properties with uniform management rates. A second SSM approach is regression based, where a prescription regression equation based on sampled variables and known crop response to treatment is used for more continuous targeted treatment within the field. This thesis articulates the thematic mapping of agronomic variables and the comparison of two site-specific management strategies for wild blueberry using conventional soil sampling, proximal soil sensors, and multispectral satellite imagery. Two experimental sites were selected, one of varying topography and the other relatively at. Soil samples were collected in a 33-m grid scheme and tested for chemical and granulometric attributes. Soil apparent electrical conductivity (ECa) was collected with the non-contact DUALEM-21S sensor (Dualem Inc., Milton, ON) and the contact Veris 3100 sensor (Veris Technologies, Salina, KS). Elevation was mapped with real-time-kinematic (RTK) level global navigation satellite system (GNSS) receiver. Multispectral imagery acquired from the SPOT6 archive was radiometrically and atmospherically corrected, and a number of vegetation indices were derived from the image to map bare spots and compare VIs prediction of vigor to the sampled yield. Thematic maps were predicted from the sampled data using the Ordinary Kriging (OK) method and cross-validated to determine the strength of various data layers in predicting spatial patterns within-field. Classical statistics and geostatistics were performed on all sampled data. A classic approach to site-specific management through unsupervised classification of management zones was compared with a new regression-based approach which targets four field condition scenarios. Means of all properties in each of four scenarios were tested with ANOVA and Tukey's post-hoc test. In both MZA and the regression-based method, field conditions were most contrasted between scenarios EClow & Elevhigh and EChigh & Elevlow. The regression-based method separated data similarly or better than the MZA approach, while providing more precise areas to develop a regression-based prescription map.
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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 | 0,001 | 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 ».