La perception des gens de couleur par les Nantais à la fin du XVIIIe siècle Auteur(s) : Michon, Bernard Michon, Bernard Année de publication : Loading the player... Éditeur(s) : AIHP-GEODE : Archéologie Industrielle, Histoire, Patrimoine/Géographie- Développement Environnement de la Caraïbe CRPLC : Centre de Recherche sur les Pouvoirs Locaux dans la Caraïbe Université de Paris I Panthéon-Sorbonne IHRF-IHMC : Institut d CRESOI : Centre de Recherches sur les Sociétés de l CRILLASH : Centre de Recherches Interdisciplinaires en Lettres, Langues, Arts et Sciences Humaines Les Anneaux de la Mémoire Extrait de : "La révolution française et les colonies. Couleur de peau dans l'espace colonial français (1777-1815)" : grand séminaire, les 17 et 18 mai 2016. Université des Antilles Description : Capitale française de la traite négrière tout au long du XVIIIe siècle, le port de Nantes doit une bonne part de son développement aux échanges croissants avec les colonies de plantation. Le recours à la main d'oeuvre servile est dès lors présenté comme une impérieuse nécessité, bien mise en évidence dans le témoignage de Listré, un Nantais devenu avocat au Cap-Français, au nord de l'île de Saint-Domingue. Cétait en Afrique qu'on allait chercher les cultivateurs. On ne saurait s'en passer sans renoncer aux Colonies. La montée d'un courant de pensée hostile à l'esclavage, évidemment peu perceptible dans une place comme Nantes, ajoutée aux vives tensions traversant les sociétés coloniales et surtout à la Révolution noire de Saint-Domingue, conduisent les Nantais à justifier dans divers écrits ce système vacillant. La communication s'intéresse surtout à la manière dont ces Nantais, appartenant majoritairement au monde du négoce mais aussi à celui des navigants, présentent les Noirs et gens de couleur. Au-delà de la diversité des populations ? rois et courtiers africains, esclaves et libres de couleur ?, il s'agit de mettre en évidence la radicalisation du discours et ses causes fondamentales. Siècle(s) traité(s) : 18 Permalien : http://www.manioc.org/fichiers/V16098 | Partager |
Fertigating lettuce (Lactuca sativa L..) using compost tea Auteur(s) : Eudoxie, Gaius Année de publication : Loading the player... Éditeur(s) : Université des Antilles. Service commun de la documentation University of West Indies, Trinidad &Tobago Extrait de : 52e congrès annuel de la Société caribéenne des plantes alimentaires / 52nd annual meeting of the Caribbean food crops society (CFCS), du 10 au 16 juillet 2016. INRA, CFCS Description : Crop nutrient management is a critical component of productivity and quality. Commercial horticulture has relied almost exclusively on inorganic nutrient sources to satisfy plant nutritional requirements. Compost tea represents a sustainable alternative technology but its use has not been extensively researched. A factorial experiment was conducted subjecting lettuce plants to four increasing concentrations of compost tea; 0, 5, 10 and 20 % (m/v) applied at either 100 or 200 cm3 plant-1 day-1, for 30 days. At the end of the trial, measurements were made of leaf area (LA), yield, shoot and root dry mass (DM), root to shoot ratio, and nitrogen (N) and phosphorus (P) contents of shoots and roots. Compost tea concentration significantly (P < 0.05) affected all growth indices showing a similar pattern. Increasing concentration up to 10 % (m/v), positively improved growth and yield above the control. Increasing further to 20 % (m/v) reduced LA, yield and dry mass. For these variables, applying compost tea at 200 cm3 plant-1 day-1 resulted in a better response. Increasing concentration of compost tea showed a directly proportional relationship to shoot and root N content. However, the effect was non-significant for P. Yield and shoot DM were affected by the combination of compost tea concentration and application rate. Similar patterns of increasing yield were seen for increasing concentration within both rates however, the differences were significant for all concentrations at the higher application rate. Application of 200 cm3, 5 % compost tea resulted in the greatest yield, shoot and root DM. In addition to root DM, root surface area was significantly correlated with yield and shoot DM. Compost tea used at appropriate concentrations improved root growth and lettuce productivity. Siècle(s) traité(s) : 21 Permalien : http://www.manioc.org/fichiers/V16281 | Partager |
Applying C-13 techniques in exploring the carbon sequestration potential of limed acid soils fromt Trinidad Auteur(s) : Gouveia, Grégory Année de publication : Loading the player... Éditeur(s) : University of West Indies, Trinidad &Tobago Université des Antilles. Service commun de la documentation Extrait de : 52e congrès annuel de la Société caribéenne des plantes alimentaires / 52nd annual meeting of the Caribbean food crops society (CFCS), du 10 au 16 juillet 2016. INRA, CFCS Description : Carbon dioxide (CO2) accounts for the largest proportion (74%) of total greenhouse gas (GHG) emissions globally, with agricultural activities contributing approximately 25% of this gas. Opportunities to reduce the emissions in the sector can therefore contribute significantly to mitigating global climate change. Ag-lime is used extensively to alleviate problems of soil acidity and the potential for this material to contribute to C sequestration in soils is gaining interest among researchers. A laboratory experiment using C-13 isotopic labelling techniques was therefore established to answer the following questions: 1) Is there a potential for sequestering C using ag-lime in Trinidad acid soils? 2) Does enhancing soil microbial respiration by applying labile organic amendments enhance the C sequestration potential of ag-lime? 3) Are lime-derived C (LDC) estimates from non-isotopic difference technique comparable to that from the C- 13 isotopic labelling technique? The results ascertained for the study showed significant (P<0.05) differences between the LDC estimates from the two techniques with the non-isotopic techniques yielding higher estimates. Over the 32- day experiment, between 16.4 to 85.4% of the ag-lime C was released as CO2 with values being lower for the Piarco soil. The LDC in the CO2 was also significantly (P<0.05) lower for the poultry litter treatments comparison to the other organic amendments for the Piarco soil but not the Nariva soil. This effect may not have been as a result of an enhancement of the carbon sequestration potential of the ag-lime due to an elevation in soil microbial respiration since the LDC in the glucose-amended soils did not differ significantly from the no-amendment control soils. Siècle(s) traité(s) : 21 Permalien : http://www.manioc.org/fichiers/V16308 | Partager |