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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 11.
  1. Library Resource
    Documentos de conferencias e informes
    Diciembre, 2015
    África septentrional, Egipto, Marruecos, Sudán, Túnez, África oriental, Burundi, Djibouti, Eritrea, Etiopía, Kenya, Madagascar, Malawi, Mozambique, Rwanda, Sudán del Sur, Tanzania, Zambia, Zimbabwe, África Central, Angola, Camerún, República Centroafricana, Chad, Congo, República Democrática del Congo, Gabón, África austral, Botswana, Lesotho, Namibia, Sudáfrica, Esuatini, África occidental, Benin, Burkina Faso, Ghana, Guinea, Côte d'Ivoire, Liberia, Malí, Mauritania, Níger, Nigeria, Senegal, Sierra Leona, Togo

    Land degradation and desertification are among the biggest environmental challenges of our time. In the last 40 years, we lost nearly a third of the world’s arable farmland due to erosion, just as the number of people to be fed from it almost doubled. That’s why the UN General Assembly declared 2015 as the International Year of Soils. And the good news is that this new report shows that while Africa remains the most severely a«ected region, the benefit of taking action across the continent outweighs the cost of implementing it: not just by a little, but by a factor of seven.

  2. Library Resource
    Enero, 2002
    Liberia, Benin, Ghana, Sierra Leona, Togo, Côte d'Ivoire, África subsahariana

    Kissidougou in Guinea, West Africa, is characterised by so-called 'forest islands', relics - it was assumed -of original dense forest cover. It was also assumed that local cultivation practice was to blame for the destruction of the trees. However, as collaborative research led by the School of Oriental and African Studies, the Institute of Development Studies and Guinean researchers discovered, villagers had a different story to tell: that the forest islands had in fact been established over several generations as part of a process of deliberate forest management.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2005
    Angola, Burkina Faso, Bangladesh, Nigeria, Rwanda, Malí, Burundi, Zimbabwe, Esuatini, Ghana, Congo, Sierra Leona, Malawi, Níger, Mozambique, Liberia, Lesotho, Madagascar, Togo, Botswana, Gabón, Kenya

    Les évaluations des bilans en éléments nutritifs aident à déterminer les effets des pratiques agricoles sur la fertilité des sols. Selon les situations, plusieurs approches et méthodes ont été utilisées. Ce bulletin présente un apercu de la situation actuelle des études des bilans en elements nutritifs. Il fait apparaître l'évolution des différentes approches et méthodes, les compare et souligne les améliorations effectuées ainsi que les questions qui restent à résoudre.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 1998
    Liberia, Benin, Ghana, Sierra Leona, Esuatini, África

    La plupart des numros d'Unasylva sont axs sur un thme particulier. L'objectif n'est pas de prsenter une introduction ou un manuel sur le sujet choisi (ce qui serait impossible tant donn le format de la revue), mais plutt de proposer une srie d'analyses sur des aspects spcifiques qui contribuent veiller l'intrt et l'attention du lecteur. Les articles sont dits de faon intresser les lecteurs dont le travail porte essentiellement sur le thme choisi, ainsi que la majorit des lecteurs qui travaillent dans d'autres disciplines.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 1998
    Liberia, Benin, Ghana, Sierra Leona, Esuatini, Italia, África

    Most issues of Unasylva focus on a specific theme. The objective of this thematic orientation is to examine in depth a given aspect of forest and forestry development in order to highlight its significance and importance within our wider universe. The aim is not to serve as a primer or textbook on the chosen subject (this clearly would he impossible given the limited size of the journal) but rather to present a series of analyses on specific aspects that help to spark interest and awareness.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 1998
    Liberia, Benin, Ghana, Sierra Leona, Esuatini, África

    La mayor parte de los nmeros de Unasylva se centran en un tema concreto. El objetivo de esa orientacin temtica es examinar de forma pormenorizada un aspecto determinado de las actividades y el desarrollo forestales, con el fin de resaltar su significado e importancia dentro de los confines ms amplios de nuestro universo. Sin pretender que los diferentes nmeros sean como un manual de una materia concreta, se propone presentar una serie de anlisis de cuestiones especficas que contribuyan a suscitar inters y a concienciar al lector.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 1984
    Argelia, Egipto, Liberia, Estados Unidos de América, Alemania, Marruecos, Côte d'Ivoire, Guinea, Sierra Leona, África

    This paper is written in fulfilment of the requirement of the Associate Regional Advisers (ARA) Programme which is run under the auspices of the Forest Industries Advisory Group (FIAG) for Africa. The objective of the Forest Industries Advisory Group is to assist African countries in promoting the growth of forest industries and their optimum contribution to economic and social development.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 1980
    Benin, Nigeria, Zambia, Malí, Ghana, Congo, Sierra Leona, Níger, Colombia, Kenya, Liberia, Japón, Camerún, Chad, Senegal, Sudán, Togo, Côte d'Ivoire, África

    Policy makers as well as scientists have started to acquire an honest appreciation of the possibilities of reducing the wastage of materials which could be profitably utilized for improving or maintaining soil productivity. In addition, the great opportunities offered by making more efficient use of the potentials of biological nitrogen fixation in farming systems are now fully recognized. A number of recommendations and suggested guidelines were made by the various Working Groups during the two-week Workshop.

  9. Library Resource
    Informes e investigaciones
    Diciembre, 1969
    Argelia, Francia, Rwanda, Canadá, Alemania, Dinamarca, Marruecos, Reino Unido, Ghana, Sierra Leona, Malawi, Níger, Camerún, Kenya, Liberia, Uganda, Gabón, Botswana, Senegal, Chad, Togo, Côte d'Ivoire

    Meeting Name: African Forestry Commission
    Meeting symbol/code: FO-AFC/69/REP.
    Session: Sess. 2

  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 1995
    Angola, Burkina Faso, Estados Unidos de América, Mozambique, Burundi, Francia, Ghana, Congo, Djibouti, Sierra Leona, Níger, Rwanda, Liberia, Togo, Botswana, India, Senegal, Gabón, Kenya

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