Search results for "ESOL"

Contribution des pollinisateurs dans la production de colza et de tournesol en zone atelier « Plaine et Val de Sèvre »

2018

Insect pollination is essential for over 70% of crops around the world. However, the contribution of pollinators to crop production and the insects involved in crop pollination have rarely been studied. Moreover, assessments of pollinator contributions have mostly been conducted on a small scale or under simplified conditions, which do not represent the real contributions at the field scale and do not take into account possible interactions between pollinators and farming practices. The aim of this study is to quantify directly under field conditions, the contribution of pollinators in two crops frequently cultivated in Europe: oilseed rape and sunflower. Estimations are realized both at th…

GenoSol : La mémoire des sols

2013

Article sur GenoSol, interview de S. Dequiedt EA GenoSol

Adventices du tournesol : la nuisibilité n'est pas linéaire

2018

Prod 2018-41 EA GESTAD INRA; Une étude a analysé la relation entre le rendement du tournesol et la densité d’adventices présentes sur des parcelles n’ayant subi aucun désherbage. La nuisibilité des adventices croît avec la densité des adventices, mais pas de façon proportionnelle. En particulier, la nuisibilité directe ne s’exprime pas à faible densité d’adventice.

Analyse de risque phytosanitaire [i]Plasmopara halstedii[/i] agent responsable de la maladie du mildiou du tournesol

2014

Mapping soil and substratum at a very high spatial resolution in the hillslope of Couchey (France)

2012

International audience; In this work, we present a method based on very high spatial resolution (VHSR) aerial images acquired in the visible domain and that map soil surface diversity at the hillslope scale with a spatial resolution of a few centimeters. This method combines aerial VHSR image classification with local soil sampling. Principal component analysis (PCA) and non-supervised classification was performed on image characteristics to define soil surface characteristic classes (SSC). Then soil surface mapping was combined with soil surface descriptions and soil profiles to define soil types by physical and chemical characteristics. As soil results from parent material alteration, ide…

Environment and plant economy during the Mesolithic in the Haut-Quercy (Lot, France) : anthracological and carpological data.

2011

International audience; Environment and plant economy during the Mesolithic in the Haut-Quercy (Lot, France) : anthracological and carpological data.

Kartering & waardering van een steentijdvindplaats met resten uit het mesolithicum te Lier-Duwijck II (prov. Antwerpen, B)

2012

Deze bijdrage presenteert de resultaten van een prospectie- en waarderingsonderzoek te Lier-Duwijck II (prov. Antwerpen), ter hoogte van een locatie die gekenmerkt wordt door de aanwezigheid van (mesolithische) lithische artefacten en verkoolde ecofacten in zandlemige afzettingen. Het artikel bespreekt de resultaten van een veldverkenning, manuele boringen, een proefputtenonderzoek en een daaropvolgende kleinschalige opgraving van een cluster geassocieerd met een windvalstructuur.

Application of a simple algorithm to estimate daily evapotranspiration from NOAA–AVHRR images for the Iberian Peninsula

2007

International audience; Evapotranspiration (ET) is a key process in land surface–atmosphere studies. It mainly depends on water availability and incoming solar radiation and then reflects the interactions between surface water processes and climate. In this paper, a methodology for retrieving ET from low spatial resolution remote sensing data is presented. It is based on the evaporative fraction concept, and it has been applied to Advanced Very High Resolution Radiometer (AHVRR) data acquired over the Iberian Peninsula. The methodology does not require other data than the data provided by the satellite and may be applied to areas with almost spatially constant atmospheric conditions and whi…

A 3D multispectral integrated acquisition system : acquisition, data coding and compression

2010

We have developed an integrated system permitting the simultaneous acquisition of the 3D shape and the spectral spectral reflectance of scanned object surfaces. We call this system a 3D multispectral scanner because it combines within a stereopair, a multispectral video camera and a structured light projector. We see several application possibilities for a such acquisition system but we want to highlight applications in the field of digital archiving and broadcasting for heritage objects. In the manuscript we first introduce the acquisition system and its necessary calibrations and treatments needed for his use. Then, once the acquisition system is functional, data that are generated are ri…

Performances of neural networks for deriving LAI estimates from existing CYCLOPES and MODIS products

2008

International audience; This paper evaluates the performances of a neural network approach to estimate LAI from CYCLOPES and MODIS nadir normalized reflectance and LAI products. A data base was generated from these products over the BELMANIP sites during the 2001-2003 period. Data were aggregated at 3 km x 3 km, resampled at 1/16 days temporal frequency and filtered to reject outliers. VEGETATION and MODIS reflectances show very consistent values in the red, near infrared and short wave infrared bands. Neural networks were trained over part of this data base for each of the 6 MODIS biome classes to retrieve both MODIS and CYCLOPES LAI products. Results show very good performances of neural …