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Mostrando ítems 1 a 9 de 391.
  1. Library Resource
    Informes e investigaciones
    Enero, 1996
    África

    This paper presents the An assessment of urban environmental problems and policies in selected ECA member states, of the Ninth Session of the Conference of African Planners, Statisticians, Population and Information Specialists held at Addis Ababa, Ethiopia.

  2. Library Resource
    Documentos de conferencias e informes
    Diciembre, 1996
    África

    Historically, water management has not been easy in the sub-region. Three climate interlinked factors have had a direct influence on it. The first is the aridity that affects all countries of the sub-region. It is impressing to think that about ninety percent of the area of the Maghrebine countries receive less than 100 mm rainfall per year that is poorly distributed. The second is the huge evaporation from open water reservoirs. For example, annual losses due to canal evaporation reach 2 cubic km in Egypt. Another factor is drought.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 1996
    México, Canadá, Guatemala, África septentrional, Asia meridional

    This paper discusses the centers of origin and diversity for bread wheat; sketches historical patterns in the sources and use of wheat genetic resources in modern plant breeding; identifies and compares indicators of genetic diversity used by social and biological scientists; reviews the relationship of wheat genetic diversity to yield stability and vulnerability to disease; develops a profile of the structure of genetic variation in wheat in the developing world today; and investigates how scientific plant breeding has influenced the structure of genetic variation among the major bread whe

  4. Library Resource
    Documentos de política y resúmenes
    Julio, 1996
    Sudáfrica, África austral

    "July 1996." Includes bibliographical references (p. 37-41).
    The paper presents a "Watershed Computable General Equilibrium (CGE) Model "for the Olifants River Catchment." A CGE provides an appropriate framework in which to explore policy alternatives for achieving more efficient water and land use.

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