Search results for "CEMAGREF"
showing 6 items of 6 documents
Qualité et performance de plants de Douglas soumis à différentes contraintes hydriques
1999
An experiment was carried out on 12 Douglas fir seedlings lots that were 3 years old and had all originated from the same seed lot. Treatments consisted in combining stock type with three different height to diameter ratios, storage duration and method (long at 2°C or short in various conditions), and protection from desiccation (by bagging or not). Seedling lots were assessed at planting by root electrolyte leakage (REL), root moisture content (RMC) and predawn shoot water potential (Ywp). They were planted simultaneously in well-watered or water-stressed conditions. Performance level was based on survival and height growth at the end of the growing season. Slender seedlings not bagged had…
La restauration des grands migrateurs rhodaniens et méditerranéens : contribution des sciences biologiques et sociales
2001
In order to warrant the sustainability of migratory fish in the Rhone and Mediterranean area, two policies have been developed. The first one, concerning shads, has already made possible to pass the first three locks and several weirs on the tributaries. Symmetrically, a concerted restoration plan has been elaborated for the restoration of eels populations. Its main objective consists of making resettlement of their habitat, fully performing their ecologically regulating role, and satisfying social and economic requirements. The role of scientists appears to be major, for diagnosing and assessing the ecological justification of the actions, their technical viability (esp. of stocking), and …
Comparaison de deux méthodes de correction atmosphérique des données thermiques de Landsat TM
1996
The high resolution of Landsat Thematic Mapper (TM) thermal infrared data can be interesting in applications such as energy balance and crop water stress studies. However, surface temperature measurements are strongly affected by atmospheric effects, particularly by water vapour absorption, therefore a correction method is absolutely necessary. The impossibility of applying a split-window equation and the difficulty of having temporarily coincident radiosondes produce a slight use of Landsat TM data to obtain surface temperature. Vidal et al. show that in a zone with homogeneous climatic conditions, atmospheric correction can be evaluated by using energy balance equation and standard meteor…
Transaction costs and private provision of public goods: a survey of french speaking literature
2003
The authors survey the French-speaking literature on the private provision of public goods. As it is now accepted that transaction costs are one of the most important factors to analyze market failures, the authors emphasize particularly transaction cost economics research works. They wrote twelve lecture notes (annex).
Alachlor and Bentazone Losses from Subsurface Drainage of Two Soils
2004
International audience; Atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) is frequently detected at high concentrations in ground water. Bentazone [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] plus alachlor (2-chloro-2',6'-diethyl-N-methoxymethylacetanilide) is a potential herbicide combination used as a substitute for atrazine. Thus, the objective of this study was to assess the environmental risk of this blend. Drainage water contamination by bentazone and alachlor was assessed in silty clay (Vertic Eutrochrept) and silt loam (Aquic Hapludalf) soils under the same management and climatic conditions. Drainage volumes and concentrations of alachlor and bent…
Improved detection of flavescence dorée and related phytoplasma in the elm yellows group in difficult material, with specific PCR primers that amplif…
2000
Molecular-based methods are sometimes not sensitive enough to detect low-titre phytoplasmas in woody hosts. In order to enable the reliable routine diagnosis of Grapevine Yellows in dormant grapevine material, INRA-Dijon constructed new FD9 primers which, used in one step-PCR, proved very effective for the detection of phytoplasmas in symptomatic grapevine and elm. Used in nested-PCR assays, they provided an excellent signal from phloem chips or whole tissues taken from either canes or roots of dormant plants. Their restriction patterns were shown to be as informative as those from the original FD9 product. The new primers will help in the development of sanitary certification protocols and…