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Is it possible to assess the spatial variability of vine water status? Inra
Acevedo-Opazo, C.; Tisseyre, B.; Ojeda, H.; Ortega-Farias, S.; Guillaume, S..
Objectif: L'évolution de l'état hydrique de la plante au cours du cycle végétatif est un paramètre important pour la gestion du vignoble et de la qualité de la vendange. Malheureusement, cette mesure fait appel à des dispositifs spécifiques particulièrement contraignants, ce qui limite fortement le nombre de mesures réalisables. La résolution spatiale et temporelle des mesures d'état hydrique est donc généralement faible. Compte tenu de la forte variabilité spatiale observée en viticulture, l'extrapolation de quelques mesures ponctuelles à une zone plus large peut s'avérer délicate. La conception d'outils et de méthodes qui permettent de caractériser cette variabilité constitue à la fois un enjeu et un défi. L'objectif de ce travail est de proposer une...
Tipo: Journal Article Palavras-chave: ETAT HYDRIQUE; VARIABILITE SPATIALE ET TEMPORELLE; ZONES DE RESTRICTION HYDRIQUE; VIGNOBLE GRAPEVINE; VINE WATER STATUS; SPATIAL AND TEMPORAL VARIABILITY; WATER RESTRICTION ZONES.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200956e2f09d&uri=/notices/prodinra1/2010/02/
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Spatial extrapolation of the vine (Vitis vinifera L.) water status: a first step towards a spatial prediction model Inra
Acevedo-Opazo, C.; Tisseyre, B.; Ojeda, H.; Guillaume, S..
The goal of this study is to propose a model that allows for spatial extrapolation of the vine water status over a whole field from a single reference site. The precision of the model was tested using data of spatial plant water status from a commercial vineyard block located in the Languedoc-Roussillon region, France. Observations of plant water status were made on 49 sites (three vines per site) on a regular grid at various times in the growing seasons over two non-irrigated fields planted with Shiraz and MourvSdre cultivars. Plant water status was determined by measuring predawn leaf water potential (PLWP). Results showed a significant within-field variability of PLWP over space and time, and the existence of significant linear relationship amongst PLWP...
Tipo: Journal Article Palavras-chave: IMAGERIE SPATIALE; VITICULTURE DE PRECISION; STATUT HYDRIQUE VINE WATER STATUS; VINEYARD SPATIAL VARIABILITY; WATER RESTRICTION ZONE; SOIL ELECTRICAL RESISTIVITY; AIRBONE IMAGERY.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105c977d8f&uri=/notices/prodinra1/2010/08/
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The potential of high spatial resolution information to define within-vineyard zones related to vine water status Inra
Acevedo-Opazo, C.; Tisseyre, B.; Guillaume, S.; Ojeda, H..
The goal of this study was to test the usefulness of high-spatial resolution information provided by airborne imagery and soil electrical properties to define plant water restriction zones within-vineyards. The main contribution of this is to propose a study on a large area representing the regions’ vineyard diversity (different age, different varieties and different soils) located in southern France (Languedoc-Roussillon region, France). Nine non-irrigated plots were selected for this work in 2006 and 2007. In each plot, different zones were defined using the high-spatial resolution (1 m2) information provided by airborne imagery (Normalised Difference Vegetation Index, NDVI). Within each zone, measurements were conducted to assess: (i) vine water status...
Tipo: Journal Article Palavras-chave: IMAGERIE SPATIALE; VITICULTURE DE PRECISION; STATUT HYDRIQUE VINE WATER STATUS; VINEYARD SPATIAL VARIABILITY; WATER RESTRICTION ZONE; SOIL ELECTRICAL RESISTIVITY; AIRBORNE IMAGERY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200917a2c035&uri=/notices/prodinra1/2010/03/
Registros recuperados: 3
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