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Showing items 1 through 9 of 326.
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Documents de politique et mémoires
Espagne, Amériques, Amérique du Sud
Nineteen microsatellite markers were used to fingerprint a set of 19 potato landraces from the island of La Palma (Canary Islands). These landraces represent relicts of early introductions from South America, although most are commonly cultivated by local farmers. The SSR primers detected 62 polymorphisms, 13 of which were present in all landraces. Several accession- and group-specific markers were detected. Jaccard similarity coefficients were estimated from the molecular data and UPGMA cluster analysis was performed. Some cultivars with related common names clustered together.
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Algérie, Burkina Faso, Nigéria, Mauritanie, Mali, Sénégal, Éthiopie, Niger, Uruguay, Érythrée, Cameroun, Tchad, République centrafricaine, Soudan du Sud, Soudan, Brésil, Afrique, Amérique du Sud
For over a decade, the globalisation of environmental, economic and social issues has induced rapid modification in agriculture and land. These changes raise the question of future extensive livestock systems in regards to the worldwide challenge to double livestock production by 2050 in ways which are safe for the environment. In order to better understand and follow modification processes, a comparative study of livestock systems and land dynamics has been carried out on seven case studies on three continents through the use of a common grid.
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The major citrus production of the world are located between 20-40 degrees north and south latitude. In these conditions the mandarins get the best internal and external qualities.‘Arrayana’ is the main mandarin cultivated in Colombia tropical lowlands (around 04° N). This variety is characterized by a high concentration of the harvest in december and january because it has only one principal bloom in the year (two weeks after onset of rainy season); and an average external quality that prevents it from being highly competitive.
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A new species of land planarians of the genus Cratera is described. Cratera viridimaculata sp. n. was recorded in the Atlantic Forest Ecoregion, in north-eastern Argentina, and represents the first report of the genus Cratera outside Brazil. The new species is about 50 mm in length and externally characterized by a color pattern consisting of a light green olive pigmentation on the dorsum, stippled with dark gray fine spots, and dorsal eyes.
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The productivity of different lettuce groups and roquette was evaluated when sown in two different periods and cultivated either singly or intercropped. Theses experiments were carried out in Jaboticabal, São Paulo State, Brazil. The first growing period was from May to August (Autumn-Winter) and the second from September to November (Spring) of 2001. The experimental design was a randomized complete block with four replications. The treatments consisted of the combination of the following factors levels: lettuce groups (crisp, cv. Vera; looseleaf, cv. Elisa; and crisphead lettuce, cv.
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Rural settlements in Brazil were created in order to confront pressures and are characterized by the lack of planning prior to the diagnosis and implementation of the natural resources related to land suitability evaluation, distribution of classes such as topography, rivers system, vegetation, and support mechanisms.
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The vegetation cover plays a key role in protection and conservation of natural resources, particularly concerning soils. This study had as objective to analyze space and time dimensions of anthropic influence on the vegetation cover in part of the semi-arid region of the Ceará State, Brazil. LANDSAT TM-5 satellite images of 1985 and 1994 combined with geoprocessing techniques were used to verify the hypothesis of intensification of environmental degradation. Maps of the vegetation cover, land use, soils, and hydrography were elaborated.
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La Mojana region is located in the North Coast of Colombia. It is part of the alluvial extensive plain, where the Cauca, San Jorge and Magdalena rivers flow together. The region is representative of the tropical humid forest, and is affected by annual flooding cycles. The predominant soils are inceptisols, entisols, oxisols and vertisols. Human activity has been reported since pre-Columbiam times, with the Zenu culture.
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Documents et rapports de conférence
Replaced with revised version of paper 08/04/10.
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Crop classification within large agricultural regions is challenging owing to the presence of crops with similar phenological variation and intra-class variability. The development of efficient and simple classification methods is needed for more accurate mapping, monitoring, and analysis of land-use categories.
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